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Dorian Zedler 2021-05-09 20:45:59 +02:00
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GNU GENERAL PUBLIC LICENSE
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The GNU General Public License does not permit incorporating your program
into proprietary programs. If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<https://www.gnu.org/licenses/why-not-lgpl.html>.

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all:
pio -f -c vim run
upload:
pio -f -c vim run --target upload -e $(board)
clean:
pio -f -c vim run --target clean
program:
pio -f -c vim run --target program
uploadfs:
pio -f -c vim run --target uploadfs
update:
pio -f -c vim update
monitor:
pio device monitor --filter colorize

95
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# Firmware
# CO<sub>2</sub> Ampel
The CO2-ampel software.
*CO<sub>2</sub> Ampel* is an open-source project, written in C++ for ESP8266 or ESP32.
It measures the current CO<sub>2</sub> concentration (in ppm), and displays it on an LED ring.
The room should be ventilated as soon as one LED turns red.
## Features
The *CO<sub>2</sub> Ampel* can:
* Display CO2 concentration on LED ring.
* Allow calibration.
* Get current time over NTP
* Send data over MQTT.
* Send data over LoRaWAN.
* Display measurements and configuration on a small website.
* Log data to a CSV file, directly on the ESP flash memory.
## Hardware Requirements
* [ESP8266](https://en.wikipedia.org/wiki/ESP8266) or [ESP32](https://en.wikipedia.org/wiki/ESP32) microcontroller (this project has been tested with *ESP8266 ESP-12 WIFI* and *TTGO ESP32 SX1276 LoRa*)
* [Sensirion SCD30](https://www.sensirion.com/en/environmental-sensors/carbon-dioxide-sensors/carbon-dioxide-sensors-co2/) "Sensor Module for HVAC and Indoor Air Quality Applications"
* [NeoPixel Ring - 12](https://www.adafruit.com/product/1643)
See the [original documentation](https://transfer.hft-stuttgart.de/gitlab/co2ampel/ampel-documentation) for more info.
Or our Wiki [MakerLab Wiki CO2 Ampel](https://wiki.makerlab-murnau.de/books/co2-ampel).
## Software Requirements
* [PlatformIO](https://platformio.org/)
or
* [Arduino IDE](https://www.arduino.cc/en/software)
## Installation
* If `config.h` does not exist, copy it from `config.public.h`
* Modify `config.h`, e.g. for measurement time-steps, WiFi access, MQTT, NTP and web-server.
### PlatformIO
PlatformIO can be run from [VSCODE](https://platformio.org/install/ide?install=vscode), [Eclipse CDT](https://www.eclipse.org/cdt/) or console:
```bash
make upload board=esp8266 && make monitor # For ESP8266
```
```bash
make upload board=esp32 && make monitor # For ESP32
```
### Arduino IDE
* All the libraries are included in this repository. No need to install anything via *Library Manager*.
* Add your board to the [board manager](https://github.com/esp8266/Arduino#installing-with-boards-manager). Either ESP8266:
http://arduino.esp8266.com/stable/package_esp8266com_index.json
or ESP32:
https://dl.espressif.com/dl/package_esp32_index.json
* Choose the correct board in *Tools > Board > ...*
* Choose the correct *Flash size* (e.g. "Flash Size : 4MB (1MB FS, OTA:~1019kB)" for *ESP8266 ESP-12 WIFI*)
* *Verify*
* *Upload*
* *Tools > Serial Monitor*
## Authors
* Eric Duminil
* Robert Otto
* Myriam Guedey
* Tobias Gabriel Erhart
* Jonas Stave
Hochschule für Technik Stuttgart
## Modifications by
* Jens Noack
MakerLab Murnau e.V.
## Contributing
Pull requests are welcome. For major changes, please open an issue first to discuss what you would like to change.
## License
Copyright © 2020, [HfT Stuttgart](https://www.hft-stuttgart.de/)
[GPLv3](https://choosealicense.com/licenses/gpl-3.0/)

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#ifndef AMPEL_H_INCLUDED
#define AMPEL_H_INCLUDED
/*****************************************************************
* Libraries *
*****************************************************************/
#include "config.h"
#ifndef MEASUREMENT_TIMESTEP
# error Missing config.h file. Please copy config.public.h to config.h.
#endif
#ifdef AMPEL_CSV
# include "csv_writer.h"
#endif
#ifdef AMPEL_WIFI
# include "wifi_util.h"
# ifdef AMPEL_MQTT
# include "mqtt.h"
# endif
# ifdef AMPEL_HTTP
# include "web_server.h"
# endif
#endif
#ifdef AMPEL_LORAWAN
# include "lorawan.h"
#endif
#include "util.h"
#include "co2_sensor.h"
#include "led_effects.h"
#if defined(ESP8266)
//allows sensor to be seen as SENSOR_ID.local, from the local network. For example : espd03cc5.local
# include <ESP8266mDNS.h>
#elif defined(ESP32)
# include <ESPmDNS.h>
#endif
void keepServicesAlive();
void checkFlashButton();
#endif

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/***
* ____ ___ ____ _ _
* / ___/ _ \___ \ / \ _ __ ___ _ __ ___| |
* | | | | | |__) | / _ \ | '_ ` _ \| '_ \ / _ \ |
* | |__| |_| / __/ / ___ \| | | | | | |_) | __/ |
* \____\___/_____| /_/__ \_\_| |_| |_| .__/ \___|_| _
* | | | |/ _|_ _| / ___|| |_ _ _| |_| |_ __ _ __ _ _ __| |_
* | |_| | |_ | | \___ \| __| | | | __| __/ _` |/ _` | '__| __|
* | _ | _| | | ___) | |_| |_| | |_| || (_| | (_| | | | |_
* |_| |_|_| |_| |____/ \__|\__,_|\__|\__\__, |\__,_|_| \__|
* |___/
*/
#include "ampel-firmware.h"
/*****************************************************************
* GPL License *
*****************************************************************/
/*
* This file is part of the "CO2 Ampel" project ( https://transfer.hft-stuttgart.de/gitlab/co2ampel and
* https://transfer.hft-stuttgart.de/gitlab/co2ampel/ampel-firmware )
* Copyright (c) 2020 HfT Stuttgart.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, version 3.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/*****************************************************************
* Authors *
*****************************************************************/
/*
* Eric Duminil
* Robert Otto
* Myriam Guedey
* Tobias Gabriel Erhart
* Jonas Stave
*/
/*****************************************************************
* Configuration *
*****************************************************************/
/*
* Please define settings in 'config.h'.
* There's an example config file called 'config.example.h'.
* You can copy 'config.public.h' (stored in Git) to 'config.h' (not stored in Git),
* and define your credentials and parameters in 'config.h'.
*/
/*****************************************************************
* Setup *
*****************************************************************/
void setup() {
led_effects::setupOnBoardLED();
led_effects::onBoardLEDOff();
Serial.begin(BAUDS);
pinMode(0, INPUT); // Flash button (used for forced calibration)
led_effects::setupRing();
sensor::initialize();
Serial.print(F("Sensor ID: "));
Serial.println(SENSOR_ID);
Serial.print(F("Board : "));
Serial.println(BOARD);
#ifdef AMPEL_WIFI
WiFiConnect(SENSOR_ID);
Serial.print(F("WiFi - Status: "));
Serial.println(WiFi.status());
if (WiFi.status() == WL_CONNECTED) {
# ifdef AMPEL_HTTP
web_server::initialize();
# endif
ntp::initialize();
if (MDNS.begin(SENSOR_ID.c_str())) { // Start the mDNS responder for SENSOR_ID.local
MDNS.addService("http", "tcp", 80);
Serial.println(F("mDNS responder started"));
} else {
Serial.println(F("Error setting up MDNS responder!"));
}
# ifdef AMPEL_MQTT
mqtt::initialize("CO2sensors/" + SENSOR_ID);
# endif
}
#endif
#ifdef AMPEL_CSV
csv_writer::initialize();
#endif
#if defined(AMPEL_LORAWAN) && defined(ESP32)
lorawan::initialize();
#endif
}
/*****************************************************************
* Main loop *
*****************************************************************/
void loop() {
#if defined(AMPEL_LORAWAN) && defined(ESP32)
//LMIC Library seems to be very sensitive to timing issues, so run it first.
lorawan::process();
if (lorawan::waiting_for_confirmation) {
// If node is waiting for join confirmation from Gateway, nothing else should run.
return;
}
#endif
//NOTE: Loop should never take more than 1000ms. Split in smaller methods and logic if needed.
//NOTE: Only use millis() for duration comparison, not timestamps comparison. Otherwise, problems happen when millis roll over.
uint32_t t0 = millis();
keepServicesAlive();
// Short press for night mode, Long press for calibration.
checkFlashButton();
if (sensor::processData()) {
#ifdef AMPEL_CSV
csv_writer::logIfTimeHasCome(sensor::timestamp, sensor::co2, sensor::temperature, sensor::humidity);
#endif
#if defined(AMPEL_WIFI) && defined(AMPEL_MQTT)
mqtt::publishIfTimeHasCome(sensor::timestamp, sensor::co2, sensor::temperature, sensor::humidity);
#endif
#if defined(AMPEL_LORAWAN) && defined(ESP32)
lorawan::preparePayloadIfTimeHasCome(sensor::co2, sensor::temperature, sensor::humidity);
#endif
}
uint32_t duration = millis() - t0;
if (duration > max_loop_duration) {
max_loop_duration = duration;
Serial.print(F("Debug - Max loop duration : "));
Serial.print(max_loop_duration);
Serial.println(" ms.");
}
}
/**
* Checks if flash button has been pressed:
* If not, do nothing.
* If short press, toggle LED display.
* If long press, start calibration process.
*/
void checkFlashButton() {
if (!digitalRead(buttonPin)) { // Button has been pressed
led_effects::onBoardLEDOn();
delay(300);
if (digitalRead(buttonPin)) {
Serial.println(F("Flash has been pressed for a short time. Should toggle night mode."));
led_effects::toggleNightMode();
} else {
Serial.println(F("Flash has been pressed for a long time. Keep it pressed for calibration."));
if (led_effects::countdownToZero() < 0) {
sensor::startCalibrationProcess();
}
}
led_effects::onBoardLEDOff();
}
}
void keepServicesAlive() {
#ifdef AMPEL_WIFI
if (WiFi.status() == WL_CONNECTED) {
# if defined(ESP8266)
//NOTE: Sadly, there seems to be a bug in the current MDNS implementation.
// It stops working after 2 minutes. And forcing a restart leads to a memory leak.
MDNS.update();
# endif
ntp::update(); // NTP client has its own timer. It will connect to NTP server every 60s.
# ifdef AMPEL_HTTP
web_server::update();
# endif
# ifdef AMPEL_MQTT
mqtt::keepConnection(); // MQTT client has its own timer. It will keep alive every 15s.
# endif
}
#endif
}

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#include "co2_sensor.h"
namespace config {
// Values should be defined in config.h
uint16_t measurement_timestep = MEASUREMENT_TIMESTEP; // [s] Value between 2 and 1800 (range for SCD30 sensor)
const uint16_t altitude_above_sea_level = ALTITUDE_ABOVE_SEA_LEVEL; // [m]
uint16_t co2_calibration_level = ATMOSPHERIC_CO2_CONCENTRATION; // [ppm]
#ifdef TEMPERATURE_OFFSET
// Residual heat from CO2 sensor seems to be high enough to change the temperature reading. How much should it be offset?
// NOTE: Sign isn't relevant. The returned temperature will always be shifted down.
const float temperature_offset = TEMPERATURE_OFFSET; // [K]
#else
const float temperature_offset = -3.0; // [K] Temperature measured by sensor is usually at least 3K too high.
#endif
const bool auto_calibrate_sensor = AUTO_CALIBRATE_SENSOR; // [true / false]
}
namespace sensor {
SCD30 scd30;
int16_t co2 = 0;
float temperature = 0;
float humidity = 0;
String timestamp = "";
int16_t stable_measurements = 0;
uint32_t waiting_color = color::blue;
bool should_calibrate = false;
void initialize() {
#if defined(ESP8266)
Wire.begin(12, 14); // ESP8266 - SDA: D6, SCL: D5;
#endif
#if defined(ESP32)
Wire.begin(21, 22); // ESP32
/**
* SCD30 ESP32
* VCC --- 3V3
* GND --- GND
* SCL --- SCL (GPIO22) //NOTE: GPIO3 Would be more convenient (right next to GND)
* SDA --- SDA (GPIO21) //NOTE: GPIO1 would be more convenient (right next to GPO3)
*/
#endif
// CO2
if (scd30.begin(config::auto_calibrate_sensor) == false) {
Serial.println("Air sensor not detected. Please check wiring. Freezing...");
while (1) {
led_effects::showWaitingLED(color::red);
}
}
// SCD30 has its own timer.
//NOTE: The timer seems to be inaccurate, though, possibly depending on voltage. Should it be offset?
Serial.println();
Serial.print(F("Setting SCD30 timestep to "));
Serial.print(config::measurement_timestep);
Serial.println(" s.");
scd30.setMeasurementInterval(config::measurement_timestep); // [s]
Serial.print(F("Setting temperature offset to -"));
Serial.print(abs(config::temperature_offset));
Serial.println(" K.");
scd30.setTemperatureOffset(abs(config::temperature_offset)); // setTemperatureOffset only accepts positive numbers, but shifts the temperature down.
delay(100);
Serial.print(F("Temperature offset is : -"));
Serial.print(scd30.getTemperatureOffset());
Serial.println(" K");
Serial.print(F("Auto-calibration is "));
Serial.println(config::auto_calibrate_sensor ? "ON." : "OFF.");
}
//NOTE: should timer deviation be used to adjust measurement_timestep?
void checkTimerDeviation() {
static int32_t previous_measurement_at = 0;
int32_t now = millis();
Serial.print("Measurement time offset : ");
Serial.print(now - previous_measurement_at - config::measurement_timestep * 1000);
Serial.println(" ms.");
previous_measurement_at = now;
}
void countStableMeasurements() {
static int16_t previous_co2 = 0;
if (co2 > (previous_co2 - 30) && co2 < (previous_co2 + 30)) {
stable_measurements++;
Serial.print(F("Number of stable measurements : "));
Serial.println(stable_measurements);
waiting_color = color::green;
} else {
stable_measurements = 0;
waiting_color = color::red;
}
previous_co2 = co2;
}
void startCalibrationProcess() {
/** From the sensor documentation:
* For best results, the sensor has to be run in a stable environment in continuous mode at
* a measurement rate of 2s for at least two minutes before applying the FRC command and sending the reference value.
*/
Serial.println(F("Setting SCD30 timestep to 2s, prior to calibration."));
scd30.setMeasurementInterval(2); // [s] The change will only take effect after next measurement.
Serial.println(F("Waiting until the measurements are stable for at least 2 minutes."));
Serial.println(F("It could take a very long time."));
should_calibrate = true;
}
void calibrateAndRestart() {
Serial.print(F("Calibrating SCD30 now..."));
scd30.setAltitudeCompensation(config::altitude_above_sea_level);
scd30.setForcedRecalibrationFactor(config::co2_calibration_level);
Serial.println(F(" Done!"));
Serial.println(F("Sensor calibrated."));
ESP.restart(); // softer than ESP.reset
}
void logToSerial() {
Serial.print(timestamp);
Serial.print(F(" - co2(ppm): "));
Serial.print(co2);
Serial.print(F(" temp(C): "));
Serial.print(temperature, 1);
Serial.print(F(" humidity(%): "));
Serial.println(humidity, 1);
}
void displayCO2OnLedRing() {
if (co2 < 250) {
// Sensor should be calibrated.
led_effects::showWaitingLED(color::magenta);
return;
}
/**
* Display data, even if it's "old" (with breathing).
* Those effects include a short delay.
*/
if (co2 < 2000) {
led_effects::displayCO2color(co2);
led_effects::breathe(co2);
} else {
// >= 2000: entire ring blinks red
led_effects::redAlert();
}
}
/** Gets fresh data if available, checks calibration status, displays CO2 levels.
* Returns true if fresh data is available, for further processing (e.g. MQTT, CSV or LoRa)
*/
bool processData() {
bool freshData = scd30.dataAvailable();
if (freshData) {
// checkTimerDeviation();
timestamp = ntp::getLocalTime();
co2 = scd30.getCO2();
temperature = scd30.getTemperature();
humidity = scd30.getHumidity();
}
//NOTE: Data is available, but it's sometimes erroneous: the sensor outputs zero ppm but non-zero temperature and non-zero humidity.
if (co2 <= 0) {
// No measurement yet. Waiting.
led_effects::showWaitingLED(color::blue);
return false;
}
/**
* Fresh data. Log it and send it if needed.
*/
if (freshData) {
if (should_calibrate) {
countStableMeasurements();
}
logToSerial();
}
if (should_calibrate) {
if (stable_measurements == 60) {
calibrateAndRestart();
}
led_effects::showWaitingLED(waiting_color);
return false;
}
displayCO2OnLedRing();
return freshData;
}
}

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#ifndef CO2_SENSOR_H_
#define CO2_SENSOR_H_
// The SCD30 from Sensirion is a high quality Nondispersive Infrared (NDIR) based CO₂ sensor capable of detecting 400 to 10000ppm with an accuracy of ±(30ppm+3%).
// https://github.com/sparkfun/SparkFun_SCD30_Arduino_Library
#include "src/lib/SparkFun_SCD30_Arduino_Library/src/SparkFun_SCD30_Arduino_Library.h" // From: http://librarymanager/All#SparkFun_SCD30
#include "config.h"
#include "led_effects.h"
#include "util.h"
#include <Wire.h>
namespace config {
extern uint16_t measurement_timestep; // [s] Value between 2 and 1800 (range for SCD30 sensor)
extern const bool auto_calibrate_sensor; // [true / false]
extern uint16_t co2_calibration_level; // [ppm]
extern const float temperature_offset; // [K] Sign isn't relevant.
}
namespace sensor {
extern SCD30 scd30;
extern int16_t co2;
extern float temperature;
extern float humidity;
extern String timestamp;
void initialize();
bool processData();
void startCalibrationProcess();
}
#endif

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#include "csv_writer.h"
//TODO: Allow CSV download via USB Serial, when requested (e.g. via a Python script)
namespace config {
// Values should be defined in config.h
uint16_t csv_interval = CSV_INTERVAL; // [s]
}
namespace csv_writer {
unsigned long last_written_at = 0;
String last_successful_write = "";
#if defined(ESP8266)
/**
* SPECIFIC FUNCTIONS FOR LITTLEFS
*/
FSInfo fs_info;
bool mountFS() {
return LittleFS.begin(); // format if needed.
}
void updateFsInfo() {
FS_LIB.info(fs_info);
}
int getTotalSpace() {
return fs_info.totalBytes;
}
int getUsedSpace() {
return fs_info.usedBytes;
}
void showFilesystemContent() {
Dir dir = FS_LIB.openDir("/");
while (dir.next()) {
Serial.print(" ");
Serial.print(dir.fileName());
Serial.print(" - ");
if (dir.fileSize()) {
File f = dir.openFile("r");
Serial.println(f.size());
f.close();
} else {
Serial.println("0");
}
}
}
#elif defined(ESP32)
/**
* SPECIFIC FUNCTIONS FOR SPIFFS
*/
bool mountFS() {
return SPIFFS.begin(true); // format if needed.
}
void updateFsInfo() {
// Nothing to do.
}
int getTotalSpace() {
return SPIFFS.totalBytes();
}
int getUsedSpace() {
return SPIFFS.usedBytes();
}
void showFilesystemContent() {
File root = SPIFFS.open("/");
File file = root.openNextFile();
while (file) {
Serial.print(" ");
Serial.print(file.name());
Serial.print(" - ");
Serial.println(file.size());
file = root.openNextFile();
}
}
#endif
const String filename = "/" + SENSOR_ID + ".csv";
int getAvailableSpace() {
return getTotalSpace() - getUsedSpace();
}
void initialize() {
Serial.print(F("Initializing FS..."));
if (mountFS()) {
Serial.println(F("done."));
} else {
Serial.println(F("fail."));
return;
}
updateFsInfo();
Serial.println(F("File system info:"));
Serial.print(F(" Total space : "));
Serial.print(getTotalSpace() / 1024);
Serial.println("kB");
Serial.print(F(" Used space : "));
Serial.print(getUsedSpace() / 1024);
Serial.println("kB");
Serial.print(F(" Available space: "));
Serial.print(getAvailableSpace() / 1024);
Serial.println("kB");
Serial.println();
// Open dir folder
Serial.println("Filesystem content:");
showFilesystemContent();
Serial.println();
}
File openOrCreate() {
File csv_file;
if (FS_LIB.exists(filename)) {
csv_file = FS_LIB.open(filename, "a+");
} else {
csv_file = FS_LIB.open(filename, "w");
csv_file.print(F("Sensor time;CO2 concentration;Temperature;Humidity\r\n"));
csv_file.print(F("YYYY-MM-DD HH:MM:SS+ZZ;ppm;degC;%\r\n"));
}
return csv_file;
}
void log(const String &timeStamp, const int16_t &co2, const float &temperature, const float &humidity) {
led_effects::onBoardLEDOn();
File csv_file = openOrCreate();
char csv_line[42];
snprintf(csv_line, sizeof(csv_line), "%s;%d;%.1f;%.1f\r\n", timeStamp.c_str(), co2, temperature, humidity);
if (csv_file) {
size_t written_bytes = csv_file.print(csv_line);
csv_file.close();
if (written_bytes == 0) {
Serial.println(F("Nothing written. Disk full?"));
} else {
Serial.print(F("CSV - Wrote : "));
Serial.print(csv_line);
last_successful_write = ntp::getLocalTime();
}
updateFsInfo();
delay(50);
} else {
//NOTE: Can it ever happen that outfile is false?
Serial.println(F("Problem on create file!"));
}
led_effects::onBoardLEDOff();
}
void logIfTimeHasCome(const String &timeStamp, const int16_t &co2, const float &temperature, const float &humidity) {
unsigned long now = seconds();
if (now - last_written_at > config::csv_interval) {
last_written_at = now;
log(timeStamp, co2, temperature, humidity);
}
}
}

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#ifndef CSV_WRITER_H_
#define CSV_WRITER_H_
#if defined(ESP8266)
# include <LittleFS.h>
# define FS_LIB LittleFS
#elif defined(ESP32)
# include <SPIFFS.h>
# define FS_LIB SPIFFS
#else
# error Board should be either ESP8266 or ESP832
#endif
#include "config.h"
#include "util.h"
#include "led_effects.h"
namespace config {
extern uint16_t csv_interval; // [s]
}
namespace csv_writer {
extern String last_successful_write;
void initialize();
void logIfTimeHasCome(const String &timeStamp, const int16_t &co2, const float &temperature, const float &humidity);
int getAvailableSpace();
extern const String filename;
}
#endif

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#include "led_effects.h"
/*****************************************************************
* Configuration *
*****************************************************************/
namespace config {
const uint8_t max_brightness = MAX_BRIGHTNESS;
const uint8_t min_brightness = MIN_BRIGHTNESS;
const int kitt_tail = 3; // How many dimmer LEDs follow in K.I.T.T. wheel
}
/*****************************************************************
* Configuration (calculated from above values) *
*****************************************************************/
namespace config //NOTE: Use a class instead? NightMode could then be another state.
{
const uint8_t brightness_amplitude = config::max_brightness - config::min_brightness;
bool night_mode = false;
}
#if defined(ESP8266)
// NeoPixels on GPIO05, aka D1 on ESP8266.
const int NEOPIXELS_PIN = 5;
#elif defined(ESP32)
// NeoPixels on GPIO23 on ESP32. To avoid conflict with LoRa_SCK on TTGO.
const int NEOPIXELS_PIN = 23;
#endif
const int NUMPIXELS = 12;
//NOTE: One value has been prepended, to make calculations easier and avoid out of bounds index.
const uint16_t CO2_TICKS[NUMPIXELS + 1] = { 0, 500, 600, 700, 800, 900, 1000, 1200, 1400, 1600, 1800, 2000, 2200 }; // [ppm]
// const uint16_t CO2_TICKS[NUMPIXELS + 1] = { 0, 400, 500, 600, 700, 800, 900, 1000, 1100, 1200, 1300, 1400, 1500, 1600, 1800, 2000, 2200 }; // [ppm]
// For a given LED, which color should be displayed? First LED will be pure green (hue angle 120°),
// last 4 LEDs will be pure red (hue angle 0°), LEDs in-between will be yellowish.
// For reference, this python code can be used to generate the array
// NUMPIXELS = 12
// RED_LEDS = 4
// hues = [ (2**16-1) // 3 * max(NUMPIXELS - RED_LEDS - i, 0) // (NUMPIXELS - RED_LEDS) for i in range(NUMPIXELS) ]
// '{' + ', '.join([str(hue) + ('U' if hue else '') for hue in hues]) + '}; // [hue angle]'
const uint16_t LED_HUES[NUMPIXELS] = { 21845U, 19114U, 16383U, 13653U, 10922U, 8191U, 5461U, 2730U, 0, 0, 0, 0 }; // [hue angle]
// const uint16_t LED_HUES[NUMPIXELS] = { 21845U, 20024U, 18204U, 16383U, 14563U, 12742U, 10922U, 9102U, 7281U, 5461U, 3640U, 1820U, 0, 0, 0, 0 }; // [hue angle]
Adafruit_NeoPixel pixels(NUMPIXELS, NEOPIXELS_PIN, NEO_GRB + NEO_KHZ800);
namespace led_effects {
//On-board LED on D4, aka GPIO02
const int ONBOARD_LED_PIN = 2;
void setupOnBoardLED() {
pinMode(ONBOARD_LED_PIN, OUTPUT);
}
void onBoardLEDOff() {
//NOTE: OFF is LOW on ESP32 and HIGH on ESP8266 :-/
#ifdef ESP8266
digitalWrite(ONBOARD_LED_PIN, HIGH);
#else
digitalWrite(ONBOARD_LED_PIN, LOW);
#endif
}
void onBoardLEDOn() {
#ifdef ESP8266
digitalWrite(ONBOARD_LED_PIN, LOW);
#else
digitalWrite(ONBOARD_LED_PIN, HIGH);
#endif
}
void LEDsOff() {
pixels.clear();
pixels.show();
onBoardLEDOff();
}
void setupRing() {
pixels.begin();
pixels.setBrightness(config::max_brightness);
LEDsOff();
}
void toggleNightMode() {
config::night_mode = !config::night_mode;
if (config::night_mode) {
Serial.println(F("NIGHT MODE!"));
LEDsOff();
} else {
Serial.println(F("DAY MODE!"));
}
}
//NOTE: basically one iteration of KITT wheel
void showWaitingLED(uint32_t color) {
delay(80);
if (config::night_mode) {
return;
}
static uint16_t kitt_offset = 0;
pixels.clear();
for (int j = config::kitt_tail; j >= 0; j--) {
int ledNumber = abs((kitt_offset - j + NUMPIXELS) % (2 * NUMPIXELS) - NUMPIXELS) % NUMPIXELS; // Triangular function
pixels.setPixelColor(ledNumber, color * pixels.gamma8(255 - j * 76) / 255);
}
pixels.show();
kitt_offset++;
}
// Start K.I.T.T. led effect. Red color as default.
// Simulate a moving LED with tail. First LED starts at 0, and moves along a triangular function. The tail follows, with decreasing brightness.
// Takes approximately 1s for each direction.
void showKITTWheel(uint32_t color, uint16_t duration_s) {
pixels.setBrightness(config::max_brightness);
for (int i = 0; i < duration_s * NUMPIXELS; ++i) {
showWaitingLED(color);
}
}
/*
* For a given CO2 level and ledId, which brightness should be displayed? 0 for off, 255 for on. Something in-between for partial LED.
* For example, for 1500ppm, every LED between 0 and 7 (500 -> 1400ppm) should be on, LED at 8 (1600ppm) should be half-on.
*/
uint8_t getLedBrightness(uint16_t co2, int ledId) {
if (co2 >= CO2_TICKS[ledId + 1]) {
return 255;
} else {
if (2 * co2 >= CO2_TICKS[ledId] + CO2_TICKS[ledId + 1]) {
// Show partial LED if co2 more than halfway between ticks.
return 27; // Brightness isn't linear, so 27 / 255 looks much brighter than 10%
} else {
// LED off because co2 below previous tick
return 0;
}
}
}
/**
* Fills the whole ring with green, yellow, orange or black, depending on co2 input and CO2_TICKS.
*/
void displayCO2color(uint16_t co2) {
if (config::night_mode) {
return;
}
pixels.setBrightness(config::max_brightness);
for (int ledId = 0; ledId < NUMPIXELS; ++ledId) {
uint8_t brightness = getLedBrightness(co2, ledId);
pixels.setPixelColor(ledId, pixels.ColorHSV(LED_HUES[ledId], 255, brightness));
}
pixels.show();
}
void showRainbowWheel(uint16_t duration_ms, uint16_t hue_increment) {
if (config::night_mode) {
return;
}
static uint16_t wheel_offset = 0;
unsigned long t0 = millis();
pixels.setBrightness(config::max_brightness);
while (millis() - t0 < duration_ms) {
for (int i = 0; i < NUMPIXELS; i++) {
pixels.setPixelColor(i, pixels.ColorHSV(i * 65535 / NUMPIXELS + wheel_offset));
wheel_offset += hue_increment;
}
pixels.show();
delay(10);
}
}
void redAlert() {
if (config::night_mode) {
onBoardLEDOn();
delay(500);
onBoardLEDOff();
delay(500);
return;
}
for (int i = 0; i < 10; i++) {
pixels.setBrightness(static_cast<int>(config::max_brightness * (1 - i * 0.1)));
delay(50);
pixels.fill(color::red);
pixels.show();
}
}
void breathe(int16_t co2) {
if (!config::night_mode) {
static uint16_t breathing_offset = 0;
uint16_t brightness = config::min_brightness
+ pixels.sine8(breathing_offset) * config::brightness_amplitude / 255;
pixels.setBrightness(brightness);
pixels.show();
breathing_offset += 3; // breathing speed. +3 looks like slow human breathing.
}
delay(co2 > 1600 ? 50 : 100); // faster breathing for higher CO2 values
}
/**
* Displays a complete blue circle, and starts removing LEDs one by one. Returns the number of remaining LEDs.
* Can be used for calibration, e.g. when countdown is 0. Does not work in night mode.
*/
int countdownToZero() {
if (config::night_mode) {
Serial.println(F("Night mode. Not doing anything."));
delay(1000); // Wait for a while, to avoid coming back to this function too many times when button is pressed.
return 1;
}
pixels.fill(color::blue);
pixels.show();
int countdown;
for (countdown = NUMPIXELS; countdown >= 0 && !digitalRead(0); countdown--) {
pixels.setPixelColor(countdown, color::black);
pixels.show();
Serial.println(countdown);
delay(500);
}
return countdown;
}
}

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#ifndef LED_EFFECTS_H_INCLUDED
#define LED_EFFECTS_H_INCLUDED
#include <Arduino.h>
#include "config.h"
// Adafruit NeoPixel (Arduino library for controlling single-wire-based LED pixels and strip)
// https://github.com/adafruit/Adafruit_NeoPixel
// Documentation : http://adafruit.github.io/Adafruit_NeoPixel/html/class_adafruit___neo_pixel.html
#include "src/lib/Adafruit_NeoPixel/Adafruit_NeoPixel.h"
namespace color {
const uint32_t red = 0xFF0000;
const uint32_t green = 0x00FF00;
const uint32_t blue = 0x0000FF;
const uint32_t black = 0x000000;
const uint32_t magenta = 0xFF00FF;
}
namespace led_effects {
void setupOnBoardLED();
void onBoardLEDOff();
void onBoardLEDOn();
void toggleNightMode();
void LEDsOff();
void setupRing();
void redAlert();
void breathe(int16_t co2);
int countdownToZero();
void showWaitingLED(uint32_t color);
void showKITTWheel(uint32_t color, uint16_t duration_s = 2);
void showRainbowWheel(uint16_t duration_ms = 1000, uint16_t hue_increment = 50);
void displayCO2color(uint16_t co2);
}
#endif

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#include "lorawan.h"
#if defined(AMPEL_LORAWAN) && defined(ESP32)
namespace config {
// Values should be defined in config.h
uint16_t lorawan_sending_interval = LORAWAN_SENDING_INTERVAL; // [s]
static const u1_t PROGMEM APPEUI[8] = LORAWAN_APPLICATION_EUI;
static const u1_t PROGMEM DEVEUI[8] = LORAWAN_DEVICE_EUI;
static const u1_t PROGMEM APPKEY[16] = LORAWAN_APPLICATION_KEY;
}
// Payloads will be automatically sent via MQTT by TheThingsNetwork, and can be seen with:
// mosquitto_sub -h eu.thethings.network -t '+/devices/+/up' -u 'APPLICATION-NAME' -P 'ttn-account-v2.4xxxxxxxx-xxxxxxxxxx-xxxxxxxxxxxxxxxxxxxxxx' -v
// or encrypted:
// mosquitto_sub -h eu.thethings.network -t '+/devices/+/up' -u 'APPLICATION-NAME' -P 'ttn-account-v2.4xxxxxxxx-xxxxxxxxxx-xxxxxxxxxxxxxxxxxxxxxx' -v --cafile mqtt-ca.pem -p 8883
// ->
// co2ampel-test/devices/esp3a7c94/up {"app_id":"co2ampel-test","dev_id":"esp3a7c94","hardware_serial":"00xxxxxxxx","port":1,"counter":5,"payload_raw":"TJd7","payload_fields":{"co2":760,"rh":61.5,"temp":20.2},"metadata":{"time":"2020-12-23T23:00:51.44020438Z","frequency":867.5,"modulation":"LORA","data_rate":"SF7BW125","airtime":51456000,"coding_rate":"4/5","gateways":[{"gtw_id":"eui-xxxxxxxxxxxxxxxxxx","timestamp":1765406908,"time":"2020-12-23T23:00:51.402519Z","channel":5,"rssi":-64,"snr":7.5,"rf_chain":0,"latitude":22.7,"longitude":114.24,"altitude":450}]}}
// More info : https://www.thethingsnetwork.org/docs/applications/mqtt/quick-start.html
void os_getArtEui(u1_t *buf) {
memcpy_P(buf, config::APPEUI, 8);
}
void os_getDevEui(u1_t *buf) {
memcpy_P(buf, config::DEVEUI, 8);
}
void os_getDevKey(u1_t *buf) {
memcpy_P(buf, config::APPKEY, 16);
}
namespace lorawan {
bool waiting_for_confirmation = false;
bool connected = false;
String last_transmission = "";
void initialize() {
Serial.println(F("Starting LoRaWAN. Frequency plan : " LMIC_FREQUENCY_PLAN " MHz."));
// More info about pin mapping : https://github.com/mcci-catena/arduino-lmic#pin-mapping
// Has been tested successfully with ESP32 TTGO LoRa32 V1, and might work with other ESP32+LoRa boards.
const lmic_pinmap *pPinMap = Arduino_LMIC::GetPinmap_ThisBoard();
// LMIC init.
os_init_ex(pPinMap);
// Reset the MAC state. Session and pending data transfers will be discarded.
LMIC_reset();
// Join, but don't send anything yet.
LMIC_startJoining();
}
// Checks if OTAA is connected, or if payload should be sent.
// NOTE: while a transaction is in process (i.e. until the TXcomplete event has been received, no blocking code (e.g. delay loops etc.) are allowed, otherwise the LMIC/OS code might miss the event.
// If this rule is not followed, a typical symptom is that the first send is ok and all following ones end with the TX not complete failure.
void process() {
os_runloop_once();
}
void printHex2(unsigned v) {
v &= 0xff;
if (v < 16)
Serial.print('0');
Serial.print(v, HEX);
}
void onEvent(ev_t ev) {
Serial.print("LoRa - ");
Serial.print(ntp::getLocalTime());
Serial.print(" - ");
switch (ev) {
case EV_JOINING:
Serial.println(F("EV_JOINING"));
break;
case EV_JOINED:
waiting_for_confirmation = false;
connected = true;
led_effects::onBoardLEDOff();
Serial.println(F("EV_JOINED"));
{
u4_t netid = 0;
devaddr_t devaddr = 0;
u1_t nwkKey[16];
u1_t artKey[16];
LMIC_getSessionKeys(&netid, &devaddr, nwkKey, artKey);
Serial.print(F(" netid: "));
Serial.println(netid, DEC);
Serial.print(F(" devaddr: "));
Serial.println(devaddr, HEX);
Serial.print(F(" AppSKey: "));
for (size_t i = 0; i < sizeof(artKey); ++i) {
if (i != 0)
Serial.print("-");
printHex2(artKey[i]);
}
Serial.println();
Serial.print(" NwkSKey: ");
for (size_t i = 0; i < sizeof(nwkKey); ++i) {
if (i != 0)
Serial.print("-");
printHex2(nwkKey[i]);
}
Serial.println();
}
Serial.println(F("Other services may resume, and will not be frozen anymore."));
// Disable link check validation (automatically enabled during join)
LMIC_setLinkCheckMode(0);
break;
case EV_JOIN_FAILED:
Serial.println(F("EV_JOIN_FAILED"));
break;
case EV_REJOIN_FAILED:
Serial.println(F("EV_REJOIN_FAILED"));
break;
case EV_TXCOMPLETE:
last_transmission = ntp::getLocalTime();
Serial.println(F("EV_TXCOMPLETE"));
break;
case EV_TXSTART:
waiting_for_confirmation = !connected;
Serial.println(F("EV_TXSTART"));
break;
case EV_TXCANCELED:
waiting_for_confirmation = false;
led_effects::onBoardLEDOff();
Serial.println(F("EV_TXCANCELED"));
break;
case EV_JOIN_TXCOMPLETE:
waiting_for_confirmation = false;
led_effects::onBoardLEDOff();
Serial.println(F("EV_JOIN_TXCOMPLETE: no JoinAccept."));
Serial.println(F("Other services may resume."));
break;
default:
Serial.print(F("LoRa event: "));
Serial.println((unsigned) ev);
break;
}
if (waiting_for_confirmation) {
led_effects::onBoardLEDOn();
Serial.println(F("LoRa - waiting for OTAA confirmation. Freezing every other service!"));
}
}
void preparePayload(int16_t co2, float temperature, float humidity) {
// Check if there is not a current TX/RX job running
if (LMIC.opmode & OP_TXRXPEND) {
Serial.println(F("OP_TXRXPEND, not sending"));
} else {
uint8_t buff[3];
// Mapping CO2 from 0ppm to 5100ppm to [0, 255], with 20ppm increments.
buff[0] = (util::min(util::max(co2, 0), 5100) + 10) / 20;
// Mapping temperatures from [-10°C, 41°C] to [0, 255], with 0.2°C increment
buff[1] = static_cast<uint8_t>((util::min(util::max(temperature, -10), 41) + 10.1f) * 5);
// Mapping humidity from [0%, 100%] to [0, 200], with 0.5°C increment (0.4°C would also be possible)
buff[2] = static_cast<uint8_t>(util::min(util::max(humidity, 0) + 0.25f, 100) * 2);
Serial.print(F("LoRa - Payload : '"));
printHex2(buff[0]);
Serial.print(" ");
printHex2(buff[1]);
Serial.print(" ");
printHex2(buff[2]);
Serial.print(F("', "));
Serial.print(buff[0] * 20);
Serial.print(F(" ppm, "));
Serial.print(buff[1] * 0.2 - 10);
Serial.print(F(" °C, "));
Serial.print(buff[2] * 0.5);
Serial.println(F(" %."));
// Prepare upstream data transmission at the next possible time.
LMIC_setTxData2(1, buff, sizeof(buff), 0);
//NOTE: To decode in TheThingsNetwork:
//function Decoder(bytes, port) {
// return {
// co2: bytes[0] * 20,
// temp: bytes[1] / 5.0 - 10,
// rh: bytes[2] / 2.0
// };
//}
}
}
void preparePayloadIfTimeHasCome(const int16_t &co2, const float &temperature, const float &humidity) {
static unsigned long last_sent_at = 0;
unsigned long now = seconds();
if (connected && (now - last_sent_at > config::lorawan_sending_interval)) {
last_sent_at = now;
preparePayload(co2, temperature, humidity);
}
}
}
void onEvent(ev_t ev) {
lorawan::onEvent(ev);
}
#endif

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#ifndef AMPEL_LORAWAN_H_
#define AMPEL_LORAWAN_H_
#include "config.h"
#if defined(AMPEL_LORAWAN) && defined(ESP32)
#include <Arduino.h>
// Requires "MCCI LoRaWAN LMIC library", which will be automatically used with PlatformIO but should be added in "Arduino IDE".
// Tested successfully with v3.2.0 and connected to a thethingsnetwork.org app.
#include <lmic.h>
#include <hal/hal.h>
#include <arduino_lmic_hal_boards.h>
#include <SPI.h>
#include "led_effects.h"
#include "util.h"
namespace config {
extern uint16_t lorawan_sending_interval; // [s]
}
#if defined(CFG_eu868)
# define LMIC_FREQUENCY_PLAN "Europe 868"
#elif defined(CFG_us915)
# define LMIC_FREQUENCY_PLAN "US 915"
#elif defined(CFG_au915)
# define LMIC_FREQUENCY_PLAN "Australia 915"
#elif defined(CFG_as923)
# define LMIC_FREQUENCY_PLAN "Asia 923"
#elif defined(CFG_kr920)
# define LMIC_FREQUENCY_PLAN "Korea 920"
#elif defined(CFG_in866)
# define LMIC_FREQUENCY_PLAN "India 866"
#else
# error "Region should be specified"
#endif
namespace lorawan {
extern bool waiting_for_confirmation;
extern bool connected;
extern String last_transmission;
void initialize();
void process();
void preparePayloadIfTimeHasCome(const int16_t &co2, const float &temp, const float &hum);
}
#endif
#endif

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#include "mqtt.h"
namespace config {
// Values should be defined in config.h
uint16_t sending_interval = MQTT_SENDING_INTERVAL; // [s]
//INFO: Listen to every CO2 sensor which is connected to the server:
// mosquitto_sub -h MQTT_SERVER -t 'CO2sensors/#' -p 443 --capath /etc/ssl/certs/ -u "MQTT_USER" -P "MQTT_PASSWORD" -v
const char *mqtt_server = MQTT_SERVER;
const uint16_t mqtt_port = MQTT_PORT;
const char *mqtt_user = MQTT_USER;
const char *mqtt_password = MQTT_PASSWORD;
const bool allow_mqtt_commands = ALLOW_MQTT_COMMANDS;
const unsigned long wait_after_fail = 900; // [s] Wait 15 minutes after an MQTT connection fail, before trying again.
}
#if defined(ESP32)
# include <WiFiClientSecure.h>
#endif
WiFiClientSecure espClient;
PubSubClient mqttClient(espClient);
namespace mqtt {
unsigned long last_sent_at = 0;
unsigned long last_failed_at = 0;
bool connected = false;
String publish_topic;
const char *json_sensor_format;
String last_successful_publish = "";
void initialize(String &topic) {
json_sensor_format = PSTR("{\"time\":\"%s\", \"co2\":%d, \"temp\":%.1f, \"rh\":%.1f}");
publish_topic = topic;
#if defined(ESP8266)
espClient.setInsecure(); // Sorry, we don't want to flash the sensors every 3 months.
#endif
// mqttClient.setSocketTimeout(config::mqtt_timeout); //NOTE: somehow doesn't seem to have any effect on connect()
mqttClient.setServer(config::mqtt_server, config::mqtt_port);
}
void publish(const String &timestamp, int16_t co2, float temperature, float humidity) {
if (WiFi.status() == WL_CONNECTED && mqttClient.connected()) {
led_effects::onBoardLEDOn();
Serial.print(F("MQTT - Publishing message ... "));
char payload[75]; // Should be enough for json...
snprintf(payload, sizeof(payload), json_sensor_format, timestamp.c_str(), co2, temperature, humidity);
// Topic is the same as clientID. e.g. 'CO2sensors/ESP3d03da'
if (mqttClient.publish(publish_topic.c_str(), payload)) {
Serial.println(F("OK"));
last_successful_publish = ntp::getLocalTime();
} else {
Serial.println(F("Failed."));
}
led_effects::onBoardLEDOff();
}
}
void setTimer(String messageString) {
messageString.replace("timer ", "");
int timestep = messageString.toInt();
if (timestep >= 2 && timestep <= 1800) {
Serial.print(F("Setting Measurement Interval to : "));
Serial.print(timestep);
Serial.println("s.");
sensor::scd30.setMeasurementInterval(messageString.toInt());
config::measurement_timestep = messageString.toInt();
led_effects::showKITTWheel(color::green, 1);
}
}
void setMQTTinterval(String messageString) {
messageString.replace("mqtt ", "");
config::sending_interval = messageString.toInt();
Serial.print(F("Setting Sending Interval to : "));
Serial.print(config::sending_interval);
Serial.println("s.");
led_effects::showKITTWheel(color::green, 1);
}
#ifdef AMPEL_CSV
void setCSVinterval(String messageString) {
messageString.replace("csv ", "");
config::csv_interval = messageString.toInt();
Serial.print(F("Setting CSV Interval to : "));
Serial.print(config::csv_interval);
Serial.println("s.");
led_effects::showKITTWheel(color::green, 1);
}
#endif
void calibrateSensorToSpecificPPM(String messageString) {
messageString.replace("calibrate ", "");
long int calibrationLevel = messageString.toInt();
if (calibrationLevel >= 400 && calibrationLevel <= 2000) {
Serial.print(F("Force calibration, at "));
config::co2_calibration_level = messageString.toInt();
Serial.print(config::co2_calibration_level);
Serial.println(" ppm.");
sensor::startCalibrationProcess();
}
}
void setCO2forDebugging(String messageString) {
Serial.print(F("DEBUG. Setting CO2 to "));
messageString.replace("co2 ", "");
sensor::co2 = messageString.toInt();
Serial.println(sensor::co2);
}
void sendInfoAboutLocalNetwork() {
char info_topic[60]; // Should be enough for "CO2sensors/ESPd03cc5/info"
snprintf(info_topic, sizeof(info_topic), "%s/info", publish_topic.c_str());
char payload[75]; // Should be enough for info json...
const char *json_info_format = PSTR("{\"local_ip\":\"%s\", \"ssid\":\"%s\"}");
snprintf(payload, sizeof(payload), json_info_format, WiFi.localIP().toString().c_str(), WiFi.SSID().c_str());
mqttClient.publish(info_topic, payload);
}
/**
* Allows sensor to be controlled by commands over MQTT
*
* mosquitto_pub -h MQTT_SERVER -t 'CO2sensors/SENSOR_ID/control' -p 443 --capath /etc/ssl/certs/ -u "MQTT_USER" -P "MQTT_PASSWORD" -m "reset"
* mosquitto_pub -h MQTT_SERVER -t 'CO2sensors/SENSOR_ID/control' -p 443 --capath /etc/ssl/certs/ -u "MQTT_USER" -P "MQTT_PASSWORD" -m "timer 30"
* mosquitto_pub -h MQTT_SERVER -t 'CO2sensors/SENSOR_ID/control' -p 443 --capath /etc/ssl/certs/ -u "MQTT_USER" -P "MQTT_PASSWORD" -m "mqtt 900"
* mosquitto_pub -h MQTT_SERVER -t 'CO2sensors/SENSOR_ID/control' -p 443 --capath /etc/ssl/certs/ -u "MQTT_USER" -P "MQTT_PASSWORD" -m "calibrate 700"
*/
void controlSensorCallback(char *sub_topic, byte *message, unsigned int length) {
if (length == 0) {
return;
}
led_effects::onBoardLEDOn();
Serial.print(F("Message arrived on topic: "));
Serial.print(sub_topic);
Serial.print(F(". Message: '"));
String messageString;
for (unsigned int i = 0; i < length; i++) {
Serial.print((char) message[i]);
messageString += (char) message[i];
}
Serial.println("'.");
if (messageString.startsWith("co2 ")) {
setCO2forDebugging(messageString);
} else if (messageString.startsWith("timer ")) {
setTimer(messageString);
} else if (messageString == "calibrate") {
sensor::startCalibrationProcess();
} else if (messageString.startsWith("calibrate ")) {
calibrateSensorToSpecificPPM(messageString);
} else if (messageString.startsWith("mqtt ")) {
setMQTTinterval(messageString);
} else if (messageString == "publish") {
Serial.println(F("Forcing MQTT publish now."));
publish(sensor::timestamp, sensor::co2, sensor::temperature, sensor::humidity);
#ifdef AMPEL_CSV
} else if (messageString.startsWith("csv ")) {
setCSVinterval(messageString);
} else if (messageString == "format_filesystem") {
FS_LIB.format();
led_effects::showKITTWheel(color::blue, 2);
#endif
} else if (messageString == "night_mode") {
led_effects::toggleNightMode();
} else if (messageString == "local_ip") {
sendInfoAboutLocalNetwork();
} else if (messageString == "reset") {
ESP.restart(); // softer than ESP.reset()
} else {
led_effects::showKITTWheel(color::red, 1);
Serial.println(F("Message not supported. Doing nothing."));
}
delay(50);
led_effects::onBoardLEDOff();
}
void reconnect() {
if (last_failed_at > 0 && (seconds() - last_failed_at < config::wait_after_fail)) {
// It failed less than wait_after_fail ago. Not even trying.
return;
}
if (WiFi.status() != WL_CONNECTED) { //NOTE: Sadly, WiFi.status is sometimes WL_CONNECTED even though it's really not
// No WIFI
return;
}
Serial.print(F("MQTT - Attempting connection..."));
led_effects::onBoardLEDOn();
// Wait for connection, at most 15s (default)
mqttClient.connect(publish_topic.c_str(), config::mqtt_user, config::mqtt_password);
led_effects::onBoardLEDOff();
connected = mqttClient.connected();
if (connected) {
if (config::allow_mqtt_commands) {
char control_topic[60]; // Should be enough for "CO2sensors/ESPd03cc5/control"
snprintf(control_topic, sizeof(control_topic), "%s/control", publish_topic.c_str());
mqttClient.subscribe(control_topic);
mqttClient.setCallback(controlSensorCallback);
}
Serial.println(F(" Connected."));
last_failed_at = 0;
} else {
last_failed_at = seconds();
Serial.print(F(" Failed! Error code="));
Serial.print(mqttClient.state());
Serial.print(F(". Will try again in "));
Serial.print(config::wait_after_fail);
Serial.println("s.");
}
}
void publishIfTimeHasCome(const String &timeStamp, const int16_t &co2, const float &temp, const float &hum) {
// Send message via MQTT according to sending interval
unsigned long now = seconds();
if (now - last_sent_at > config::sending_interval) {
last_sent_at = now;
publish(timeStamp, co2, temp, hum);
}
}
void keepConnection() {
// Keep MQTT connection
if (!mqttClient.connected()) {
reconnect();
}
mqttClient.loop();
}
}

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#ifndef MQTT_H_INCLUDED
#define MQTT_H_INCLUDED
#include <Arduino.h>
#include "config.h"
#include "led_effects.h"
#ifdef AMPEL_CSV
# include "csv_writer.h"
#endif
#include "co2_sensor.h"
#include "src/lib/PubSubClient/src/PubSubClient.h"
#include "wifi_util.h"
namespace config {
extern uint16_t sending_interval; // [s]
}
namespace mqtt {
extern String last_successful_publish;
extern bool connected;
void initialize(String &topic);
void keepConnection();
void publishIfTimeHasCome(const String &timeStamp, const int16_t &co2, const float &temp, const float &hum);
}
#endif

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/*!
* @file Adafruit_NeoPixel.h
*
* This is part of Adafruit's NeoPixel library for the Arduino platform,
* allowing a broad range of microcontroller boards (most AVR boards,
* many ARM devices, ESP8266 and ESP32, among others) to control Adafruit
* NeoPixels, FLORA RGB Smart Pixels and compatible devices -- WS2811,
* WS2812, WS2812B, SK6812, etc.
*
* Adafruit invests time and resources providing this open source code,
* please support Adafruit and open-source hardware by purchasing products
* from Adafruit!
*
* Written by Phil "Paint Your Dragon" Burgess for Adafruit Industries,
* with contributions by PJRC, Michael Miller and other members of the
* open source community.
*
* This file is part of the Adafruit_NeoPixel library.
*
* Adafruit_NeoPixel is free software: you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* Adafruit_NeoPixel is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with NeoPixel. If not, see
* <http://www.gnu.org/licenses/>.
*
*/
#ifndef ADAFRUIT_NEOPIXEL_H
#define ADAFRUIT_NEOPIXEL_H
#ifdef ARDUINO
#if (ARDUINO >= 100)
#include <Arduino.h>
#else
#include <WProgram.h>
#include <pins_arduino.h>
#endif
#endif
#ifdef TARGET_LPC1768
#include <Arduino.h>
#endif
// The order of primary colors in the NeoPixel data stream can vary among
// device types, manufacturers and even different revisions of the same
// item. The third parameter to the Adafruit_NeoPixel constructor encodes
// the per-pixel byte offsets of the red, green and blue primaries (plus
// white, if present) in the data stream -- the following #defines provide
// an easier-to-use named version for each permutation. e.g. NEO_GRB
// indicates a NeoPixel-compatible device expecting three bytes per pixel,
// with the first byte transmitted containing the green value, second
// containing red and third containing blue. The in-memory representation
// of a chain of NeoPixels is the same as the data-stream order; no
// re-ordering of bytes is required when issuing data to the chain.
// Most of these values won't exist in real-world devices, but it's done
// this way so we're ready for it (also, if using the WS2811 driver IC,
// one might have their pixels set up in any weird permutation).
// Bits 5,4 of this value are the offset (0-3) from the first byte of a
// pixel to the location of the red color byte. Bits 3,2 are the green
// offset and 1,0 are the blue offset. If it is an RGBW-type device
// (supporting a white primary in addition to R,G,B), bits 7,6 are the
// offset to the white byte...otherwise, bits 7,6 are set to the same value
// as 5,4 (red) to indicate an RGB (not RGBW) device.
// i.e. binary representation:
// 0bWWRRGGBB for RGBW devices
// 0bRRRRGGBB for RGB
// RGB NeoPixel permutations; white and red offsets are always same
// Offset: W R G B
#define NEO_RGB ((0<<6) | (0<<4) | (1<<2) | (2)) ///< Transmit as R,G,B
#define NEO_RBG ((0<<6) | (0<<4) | (2<<2) | (1)) ///< Transmit as R,B,G
#define NEO_GRB ((1<<6) | (1<<4) | (0<<2) | (2)) ///< Transmit as G,R,B
#define NEO_GBR ((2<<6) | (2<<4) | (0<<2) | (1)) ///< Transmit as G,B,R
#define NEO_BRG ((1<<6) | (1<<4) | (2<<2) | (0)) ///< Transmit as B,R,G
#define NEO_BGR ((2<<6) | (2<<4) | (1<<2) | (0)) ///< Transmit as B,G,R
// RGBW NeoPixel permutations; all 4 offsets are distinct
// Offset: W R G B
#define NEO_WRGB ((0<<6) | (1<<4) | (2<<2) | (3)) ///< Transmit as W,R,G,B
#define NEO_WRBG ((0<<6) | (1<<4) | (3<<2) | (2)) ///< Transmit as W,R,B,G
#define NEO_WGRB ((0<<6) | (2<<4) | (1<<2) | (3)) ///< Transmit as W,G,R,B
#define NEO_WGBR ((0<<6) | (3<<4) | (1<<2) | (2)) ///< Transmit as W,G,B,R
#define NEO_WBRG ((0<<6) | (2<<4) | (3<<2) | (1)) ///< Transmit as W,B,R,G
#define NEO_WBGR ((0<<6) | (3<<4) | (2<<2) | (1)) ///< Transmit as W,B,G,R
#define NEO_RWGB ((1<<6) | (0<<4) | (2<<2) | (3)) ///< Transmit as R,W,G,B
#define NEO_RWBG ((1<<6) | (0<<4) | (3<<2) | (2)) ///< Transmit as R,W,B,G
#define NEO_RGWB ((2<<6) | (0<<4) | (1<<2) | (3)) ///< Transmit as R,G,W,B
#define NEO_RGBW ((3<<6) | (0<<4) | (1<<2) | (2)) ///< Transmit as R,G,B,W
#define NEO_RBWG ((2<<6) | (0<<4) | (3<<2) | (1)) ///< Transmit as R,B,W,G
#define NEO_RBGW ((3<<6) | (0<<4) | (2<<2) | (1)) ///< Transmit as R,B,G,W
#define NEO_GWRB ((1<<6) | (2<<4) | (0<<2) | (3)) ///< Transmit as G,W,R,B
#define NEO_GWBR ((1<<6) | (3<<4) | (0<<2) | (2)) ///< Transmit as G,W,B,R
#define NEO_GRWB ((2<<6) | (1<<4) | (0<<2) | (3)) ///< Transmit as G,R,W,B
#define NEO_GRBW ((3<<6) | (1<<4) | (0<<2) | (2)) ///< Transmit as G,R,B,W
#define NEO_GBWR ((2<<6) | (3<<4) | (0<<2) | (1)) ///< Transmit as G,B,W,R
#define NEO_GBRW ((3<<6) | (2<<4) | (0<<2) | (1)) ///< Transmit as G,B,R,W
#define NEO_BWRG ((1<<6) | (2<<4) | (3<<2) | (0)) ///< Transmit as B,W,R,G
#define NEO_BWGR ((1<<6) | (3<<4) | (2<<2) | (0)) ///< Transmit as B,W,G,R
#define NEO_BRWG ((2<<6) | (1<<4) | (3<<2) | (0)) ///< Transmit as B,R,W,G
#define NEO_BRGW ((3<<6) | (1<<4) | (2<<2) | (0)) ///< Transmit as B,R,G,W
#define NEO_BGWR ((2<<6) | (3<<4) | (1<<2) | (0)) ///< Transmit as B,G,W,R
#define NEO_BGRW ((3<<6) | (2<<4) | (1<<2) | (0)) ///< Transmit as B,G,R,W
// Add NEO_KHZ400 to the color order value to indicate a 400 KHz device.
// All but the earliest v1 NeoPixels expect an 800 KHz data stream, this is
// the default if unspecified. Because flash space is very limited on ATtiny
// devices (e.g. Trinket, Gemma), v1 NeoPixels aren't handled by default on
// those chips, though it can be enabled by removing the ifndef/endif below,
// but code will be bigger. Conversely, can disable the NEO_KHZ400 line on
// other MCUs to remove v1 support and save a little space.
#define NEO_KHZ800 0x0000 ///< 800 KHz data transmission
#ifndef __AVR_ATtiny85__
#define NEO_KHZ400 0x0100 ///< 400 KHz data transmission
#endif
// If 400 KHz support is enabled, the third parameter to the constructor
// requires a 16-bit value (in order to select 400 vs 800 KHz speed).
// If only 800 KHz is enabled (as is default on ATtiny), an 8-bit value
// is sufficient to encode pixel color order, saving some space.
#ifdef NEO_KHZ400
typedef uint16_t neoPixelType; ///< 3rd arg to Adafruit_NeoPixel constructor
#else
typedef uint8_t neoPixelType; ///< 3rd arg to Adafruit_NeoPixel constructor
#endif
// These two tables are declared outside the Adafruit_NeoPixel class
// because some boards may require oldschool compilers that don't
// handle the C++11 constexpr keyword.
/* A PROGMEM (flash mem) table containing 8-bit unsigned sine wave (0-255).
Copy & paste this snippet into a Python REPL to regenerate:
import math
for x in range(256):
print("{:3},".format(int((math.sin(x/128.0*math.pi)+1.0)*127.5+0.5))),
if x&15 == 15: print
*/
static const uint8_t PROGMEM _NeoPixelSineTable[256] = {
128,131,134,137,140,143,146,149,152,155,158,162,165,167,170,173,
176,179,182,185,188,190,193,196,198,201,203,206,208,211,213,215,
218,220,222,224,226,228,230,232,234,235,237,238,240,241,243,244,
245,246,248,249,250,250,251,252,253,253,254,254,254,255,255,255,
255,255,255,255,254,254,254,253,253,252,251,250,250,249,248,246,
245,244,243,241,240,238,237,235,234,232,230,228,226,224,222,220,
218,215,213,211,208,206,203,201,198,196,193,190,188,185,182,179,
176,173,170,167,165,162,158,155,152,149,146,143,140,137,134,131,
128,124,121,118,115,112,109,106,103,100, 97, 93, 90, 88, 85, 82,
79, 76, 73, 70, 67, 65, 62, 59, 57, 54, 52, 49, 47, 44, 42, 40,
37, 35, 33, 31, 29, 27, 25, 23, 21, 20, 18, 17, 15, 14, 12, 11,
10, 9, 7, 6, 5, 5, 4, 3, 2, 2, 1, 1, 1, 0, 0, 0,
0, 0, 0, 0, 1, 1, 1, 2, 2, 3, 4, 5, 5, 6, 7, 9,
10, 11, 12, 14, 15, 17, 18, 20, 21, 23, 25, 27, 29, 31, 33, 35,
37, 40, 42, 44, 47, 49, 52, 54, 57, 59, 62, 65, 67, 70, 73, 76,
79, 82, 85, 88, 90, 93, 97,100,103,106,109,112,115,118,121,124};
/* Similar to above, but for an 8-bit gamma-correction table.
Copy & paste this snippet into a Python REPL to regenerate:
import math
gamma=2.6
for x in range(256):
print("{:3},".format(int(math.pow((x)/255.0,gamma)*255.0+0.5))),
if x&15 == 15: print
*/
static const uint8_t PROGMEM _NeoPixelGammaTable[256] = {
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3,
3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 5, 6, 6, 6, 6, 7,
7, 7, 8, 8, 8, 9, 9, 9, 10, 10, 10, 11, 11, 11, 12, 12,
13, 13, 13, 14, 14, 15, 15, 16, 16, 17, 17, 18, 18, 19, 19, 20,
20, 21, 21, 22, 22, 23, 24, 24, 25, 25, 26, 27, 27, 28, 29, 29,
30, 31, 31, 32, 33, 34, 34, 35, 36, 37, 38, 38, 39, 40, 41, 42,
42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57,
58, 59, 60, 61, 62, 63, 64, 65, 66, 68, 69, 70, 71, 72, 73, 75,
76, 77, 78, 80, 81, 82, 84, 85, 86, 88, 89, 90, 92, 93, 94, 96,
97, 99,100,102,103,105,106,108,109,111,112,114,115,117,119,120,
122,124,125,127,129,130,132,134,136,137,139,141,143,145,146,148,
150,152,154,156,158,160,162,164,166,168,170,172,174,176,178,180,
182,184,186,188,191,193,195,197,199,202,204,206,209,211,213,215,
218,220,223,225,227,230,232,235,237,240,242,245,247,250,252,255};
/*!
@brief Class that stores state and functions for interacting with
Adafruit NeoPixels and compatible devices.
*/
class Adafruit_NeoPixel {
public:
// Constructor: number of LEDs, pin number, LED type
Adafruit_NeoPixel(uint16_t n, uint16_t pin=6,
neoPixelType type=NEO_GRB + NEO_KHZ800);
Adafruit_NeoPixel(void);
~Adafruit_NeoPixel();
void begin(void);
void show(void);
void setPin(uint16_t p);
void setPixelColor(uint16_t n, uint8_t r, uint8_t g, uint8_t b);
void setPixelColor(uint16_t n, uint8_t r, uint8_t g, uint8_t b,
uint8_t w);
void setPixelColor(uint16_t n, uint32_t c);
void fill(uint32_t c=0, uint16_t first=0, uint16_t count=0);
void setBrightness(uint8_t);
void clear(void);
void updateLength(uint16_t n);
void updateType(neoPixelType t);
/*!
@brief Check whether a call to show() will start sending data
immediately or will 'block' for a required interval. NeoPixels
require a short quiet time (about 300 microseconds) after the
last bit is received before the data 'latches' and new data can
start being received. Usually one's sketch is implicitly using
this time to generate a new frame of animation...but if it
finishes very quickly, this function could be used to see if
there's some idle time available for some low-priority
concurrent task.
@return 1 or true if show() will start sending immediately, 0 or false
if show() would block (meaning some idle time is available).
*/
bool canShow(void) {
if (endTime > micros()) {
endTime = micros();
}
return (micros() - endTime) >= 300L;
}
/*!
@brief Get a pointer directly to the NeoPixel data buffer in RAM.
Pixel data is stored in a device-native format (a la the NEO_*
constants) and is not translated here. Applications that access
this buffer will need to be aware of the specific data format
and handle colors appropriately.
@return Pointer to NeoPixel buffer (uint8_t* array).
@note This is for high-performance applications where calling
setPixelColor() on every single pixel would be too slow (e.g.
POV or light-painting projects). There is no bounds checking
on the array, creating tremendous potential for mayhem if one
writes past the ends of the buffer. Great power, great
responsibility and all that.
*/
uint8_t *getPixels(void) const { return pixels; };
uint8_t getBrightness(void) const;
/*!
@brief Retrieve the pin number used for NeoPixel data output.
@return Arduino pin number (-1 if not set).
*/
int16_t getPin(void) const { return pin; };
/*!
@brief Return the number of pixels in an Adafruit_NeoPixel strip object.
@return Pixel count (0 if not set).
*/
uint16_t numPixels(void) const { return numLEDs; }
uint32_t getPixelColor(uint16_t n) const;
/*!
@brief An 8-bit integer sine wave function, not directly compatible
with standard trigonometric units like radians or degrees.
@param x Input angle, 0-255; 256 would loop back to zero, completing
the circle (equivalent to 360 degrees or 2 pi radians).
One can therefore use an unsigned 8-bit variable and simply
add or subtract, allowing it to overflow/underflow and it
still does the expected contiguous thing.
@return Sine result, 0 to 255, or -128 to +127 if type-converted to
a signed int8_t, but you'll most likely want unsigned as this
output is often used for pixel brightness in animation effects.
*/
static uint8_t sine8(uint8_t x) {
return pgm_read_byte(&_NeoPixelSineTable[x]); // 0-255 in, 0-255 out
}
/*!
@brief An 8-bit gamma-correction function for basic pixel brightness
adjustment. Makes color transitions appear more perceptially
correct.
@param x Input brightness, 0 (minimum or off/black) to 255 (maximum).
@return Gamma-adjusted brightness, can then be passed to one of the
setPixelColor() functions. This uses a fixed gamma correction
exponent of 2.6, which seems reasonably okay for average
NeoPixels in average tasks. If you need finer control you'll
need to provide your own gamma-correction function instead.
*/
static uint8_t gamma8(uint8_t x) {
return pgm_read_byte(&_NeoPixelGammaTable[x]); // 0-255 in, 0-255 out
}
/*!
@brief Convert separate red, green and blue values into a single
"packed" 32-bit RGB color.
@param r Red brightness, 0 to 255.
@param g Green brightness, 0 to 255.
@param b Blue brightness, 0 to 255.
@return 32-bit packed RGB value, which can then be assigned to a
variable for later use or passed to the setPixelColor()
function. Packed RGB format is predictable, regardless of
LED strand color order.
*/
static uint32_t Color(uint8_t r, uint8_t g, uint8_t b) {
return ((uint32_t)r << 16) | ((uint32_t)g << 8) | b;
}
/*!
@brief Convert separate red, green, blue and white values into a
single "packed" 32-bit WRGB color.
@param r Red brightness, 0 to 255.
@param g Green brightness, 0 to 255.
@param b Blue brightness, 0 to 255.
@param w White brightness, 0 to 255.
@return 32-bit packed WRGB value, which can then be assigned to a
variable for later use or passed to the setPixelColor()
function. Packed WRGB format is predictable, regardless of
LED strand color order.
*/
static uint32_t Color(uint8_t r, uint8_t g, uint8_t b, uint8_t w) {
return ((uint32_t)w << 24) | ((uint32_t)r << 16) | ((uint32_t)g << 8) | b;
}
static uint32_t ColorHSV(uint16_t hue, uint8_t sat=255, uint8_t val=255);
/*!
@brief A gamma-correction function for 32-bit packed RGB or WRGB
colors. Makes color transitions appear more perceptially
correct.
@param x 32-bit packed RGB or WRGB color.
@return Gamma-adjusted packed color, can then be passed in one of the
setPixelColor() functions. Like gamma8(), this uses a fixed
gamma correction exponent of 2.6, which seems reasonably okay
for average NeoPixels in average tasks. If you need finer
control you'll need to provide your own gamma-correction
function instead.
*/
static uint32_t gamma32(uint32_t x);
protected:
#ifdef NEO_KHZ400 // If 400 KHz NeoPixel support enabled...
bool is800KHz; ///< true if 800 KHz pixels
#endif
bool begun; ///< true if begin() previously called
uint16_t numLEDs; ///< Number of RGB LEDs in strip
uint16_t numBytes; ///< Size of 'pixels' buffer below
int16_t pin; ///< Output pin number (-1 if not yet set)
uint8_t brightness; ///< Strip brightness 0-255 (stored as +1)
uint8_t *pixels; ///< Holds LED color values (3 or 4 bytes each)
uint8_t rOffset; ///< Red index within each 3- or 4-byte pixel
uint8_t gOffset; ///< Index of green byte
uint8_t bOffset; ///< Index of blue byte
uint8_t wOffset; ///< Index of white (==rOffset if no white)
uint32_t endTime; ///< Latch timing reference
#ifdef __AVR__
volatile uint8_t *port; ///< Output PORT register
uint8_t pinMask; ///< Output PORT bitmask
#endif
#if defined(ARDUINO_ARCH_STM32) || defined(ARDUINO_ARCH_ARDUINO_CORE_STM32)
GPIO_TypeDef *gpioPort; ///< Output GPIO PORT
uint32_t gpioPin; ///< Output GPIO PIN
#endif
};
#endif // ADAFRUIT_NEOPIXEL_H

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# Contribution Guidelines
This library is the culmination of the expertise of many members of the open source community who have dedicated their time and hard work. The best way to ask for help or propose a new idea is to [create a new issue](https://github.com/adafruit/Adafruit_NeoPixel/issues/new) while creating a Pull Request with your code changes allows you to share your own innovations with the rest of the community.
The following are some guidelines to observe when creating issues or PRs:
- Be friendly; it is important that we can all enjoy a safe space as we are all working on the same project and it is okay for people to have different ideas
- [Use code blocks](https://github.com/adam-p/markdown-here/wiki/Markdown-Cheatsheet#code); it helps us help you when we can read your code! On that note also refrain from pasting more than 30 lines of code in a post, instead [create a gist](https://gist.github.com/) if you need to share large snippets
- Use reasonable titles; refrain from using overly long or capitalized titles as they are usually annoying and do little to encourage others to help :smile:
- Be detailed; refrain from mentioning code problems without sharing your source code and always give information regarding your board and version of the library

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GNU LESSER GENERAL PUBLIC LICENSE
Version 3, 29 June 2007
Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.
This version of the GNU Lesser General Public License incorporates
the terms and conditions of version 3 of the GNU General Public
License, supplemented by the additional permissions listed below.
0. Additional Definitions.
As used herein, "this License" refers to version 3 of the GNU Lesser
General Public License, and the "GNU GPL" refers to version 3 of the GNU
General Public License.
"The Library" refers to a covered work governed by this License,
other than an Application or a Combined Work as defined below.
An "Application" is any work that makes use of an interface provided
by the Library, but which is not otherwise based on the Library.
Defining a subclass of a class defined by the Library is deemed a mode
of using an interface provided by the Library.
A "Combined Work" is a work produced by combining or linking an
Application with the Library. The particular version of the Library
with which the Combined Work was made is also called the "Linked
Version".
The "Minimal Corresponding Source" for a Combined Work means the
Corresponding Source for the Combined Work, excluding any source code
for portions of the Combined Work that, considered in isolation, are
based on the Application, and not on the Linked Version.
The "Corresponding Application Code" for a Combined Work means the
object code and/or source code for the Application, including any data
and utility programs needed for reproducing the Combined Work from the
Application, but excluding the System Libraries of the Combined Work.
1. Exception to Section 3 of the GNU GPL.
You may convey a covered work under sections 3 and 4 of this License
without being bound by section 3 of the GNU GPL.
2. Conveying Modified Versions.
If you modify a copy of the Library, and, in your modifications, a
facility refers to a function or data to be supplied by an Application
that uses the facility (other than as an argument passed when the
facility is invoked), then you may convey a copy of the modified
version:
a) under this License, provided that you make a good faith effort to
ensure that, in the event an Application does not supply the
function or data, the facility still operates, and performs
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a) Give prominent notice with each copy of the object code that the
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You may convey a Combined Work under terms of your choice that,
taken together, effectively do not restrict modification of the
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Library side by side in a single library together with other library
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b) Give prominent notice with the combined library that part of it
is a work based on the Library, and explaining where to find the
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6. Revised Versions of the GNU Lesser General Public License.
The Free Software Foundation may publish revised and/or new versions
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Each version is given a distinguishing version number. If the
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# Adafruit NeoPixel Library [![Build Status](https://github.com/adafruit/Adafruit_NeoPixel/workflows/Arduino%20Library%20CI/badge.svg)](https://github.com/adafruit/Adafruit_NeoPixel/actions)[![Documentation](https://github.com/adafruit/ci-arduino/blob/master/assets/doxygen_badge.svg)](http://adafruit.github.io/Adafruit_NeoPixel/html/index.html)
Arduino library for controlling single-wire-based LED pixels and strip such as the [Adafruit 60 LED/meter Digital LED strip][strip], the [Adafruit FLORA RGB Smart Pixel][flora], the [Adafruit Breadboard-friendly RGB Smart Pixel][pixel], the [Adafruit NeoPixel Stick][stick], and the [Adafruit NeoPixel Shield][shield].
After downloading, rename folder to 'Adafruit_NeoPixel' and install in Arduino Libraries folder. Restart Arduino IDE, then open File->Sketchbook->Library->Adafruit_NeoPixel->strandtest sketch.
Compatibility notes: Port A is not supported on any AVR processors at this time
[flora]: http://adafruit.com/products/1060
[strip]: http://adafruit.com/products/1138
[pixel]: http://adafruit.com/products/1312
[stick]: http://adafruit.com/products/1426
[shield]: http://adafruit.com/products/1430
---
## Installation
### First Method
![image](https://user-images.githubusercontent.com/36513474/68967967-3e37f480-0803-11ea-91d9-601848c306ee.png)
1. In the Arduino IDE, navigate to Sketch > Include Library > Manage Libraries
1. Then the Library Manager will open and you will find a list of libraries that are already installed or ready for installation.
1. Then search for Neopixel strip using the search bar.
1. Click on the text area and then select the specific version and install it.
### Second Method
1. Navigate to the [Releases page](https://github.com/adafruit/Adafruit_NeoPixel/releases).
1. Download the latest release.
1. Extract the zip file
1. In the Arduino IDE, navigate to Sketch > Include Library > Add .ZIP Library
## Features
- ### Simple to use
Controlling NeoPixels “from scratch” is quite a challenge, so we provide a library letting you focus on the fun and interesting bits.
- ### Give back
The library is free; you don’t have to pay for anything. Adafruit invests time and resources providing this open source code, please support Adafruit and open-source hardware by purchasing products from Adafruit!
- ### Supported Chipsets
We have included code for the following chips - sometimes these break for exciting reasons that we can't control in which case please open an issue!
- AVR ATmega and ATtiny (any 8-bit) - 8 MHz, 12 MHz and 16 MHz
- Teensy 3.x and LC
- Arduino Due
- Arduino 101
- ATSAMD21 (Arduino Zero/M0 and other SAMD21 boards) @ 48 MHz
- ATSAMD51 @ 120 MHz
- Adafruit STM32 Feather @ 120 MHz
- ESP8266 any speed
- ESP32 any speed
- Nordic nRF52 (Adafruit Feather nRF52), nRF51 (micro:bit)
Check forks for other architectures not listed here!
- ### GNU Lesser General Public License
Adafruit_NeoPixel is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
## Functions
- begin()
- updateLength()
- updateType()
- show()
- delay_ns()
- setPin()
- setPixelColor()
- fill()
- ColorHSV()
- getPixelColor()
- setBrightness()
- getBrightness()
- clear()
- gamma32()
## Examples
There are many examples implemented in this library. One of the examples is below. You can find other examples [here](https://github.com/adafruit/Adafruit_NeoPixel/tree/master/examples)
### Simple
```Cpp
#include <Adafruit_NeoPixel.h>
#ifdef __AVR__
#include <avr/power.h>
#endif
#define PIN 6
#define NUMPIXELS 16
Adafruit_NeoPixel pixels(NUMPIXELS, PIN, NEO_GRB + NEO_KHZ800);
#define DELAYVAL 500
void setup() {
#if defined(__AVR_ATtiny85__) && (F_CPU == 16000000)
clock_prescale_set(clock_div_1);
#endif
pixels.begin();
}
void loop() {
pixels.clear();
for(int i=0; i<NUMPIXELS; i++) {
pixels.setPixelColor(i, pixels.Color(0, 150, 0));
pixels.show();
delay(DELAYVAL);
}
}
```
## Contributing
If you want to contribute to this project:
- Report bugs and errors
- Ask for enhancements
- Create issues and pull requests
- Tell others about this library
- Contribute new protocols
Please read [CONTRIBUTING.md](https://github.com/adafruit/Adafruit_NeoPixel/blob/master/CONTRIBUTING.md) for details on our code of conduct, and the process for submitting pull requests to us.
### Roadmap
The PRIME DIRECTIVE is to maintain backward compatibility with existing Arduino sketches -- many are hosted elsewhere and don't track changes here, some are in print and can never be changed!
Please don't reformat code for the sake of reformatting code. The resulting large "visual diff" makes it impossible to untangle actual bug fixes from merely rearranged lines. (Exception for first item in wishlist below.)
Things I'd Like To Do But There's No Official Timeline So Please Don't Count On Any Of This Ever Being Canonical:
- For the show() function (with all the delicate pixel timing stuff), break out each architecture into separate source files rather than the current unmaintainable tangle of #ifdef statements!
- Please don't use updateLength() or updateType() in new code. They should not have been implemented this way (use the C++ 'new' operator with the regular constructor instead) and are only sticking around because of the Prime Directive. setPin() is OK for now though, it's a trick we can use to 'recycle' pixel memory across multiple strips.
- In the M0 and M4 code, use the hardware systick counter for bit timing rather than hand-tweaked NOPs (a temporary kludge at the time because I wasn't reading systick correctly). (As of 1.4.2, systick is used on M4 devices and it appears to be overclock-compatible. Not for M0 yet, which is why this item is still here.)
- As currently written, brightness scaling is still a "destructive" operation -- pixel values are altered in RAM and the original value as set can't be accurately read back, only approximated, which has been confusing and frustrating to users. It was done this way at the time because NeoPixel timing is strict, AVR microcontrollers (all we had at the time) are limited, and assembly language is hard. All the 32-bit architectures should have no problem handling nondestructive brightness scaling -- calculating each byte immediately before it's sent out the wire, maintaining the original set value in RAM -- the work just hasn't been done. There's a fair chance even the AVR code could manage it with some intense focus. (The DotStar library achieves nondestructive brightness scaling because it doesn't have to manage data timing so carefully...every architecture, even ATtiny, just takes whatever cycles it needs for the multiply/shift operations.)
## Credits
This library is written by Phil "Paint Your Dragon" Burgess for Adafruit Industries, with contributions by PJRC, Michael Miller and other members of the open source community.
## License
Adafruit_NeoPixel is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
Adafruit_NeoPixel is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the [GNU Lesser General Public License](https://www.gnu.org/licenses/lgpl-3.0.en.html) for more details.
You should have received a copy of the GNU Lesser General Public License along with NeoPixel. If not, see [this](https://www.gnu.org/licenses/)

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// Implements the RMT peripheral on Espressif SoCs
// Copyright (c) 2020 Lucian Copeland for Adafruit Industries
/* Uses code from Espressif RGB LED Strip demo and drivers
* Copyright 2015-2020 Espressif Systems (Shanghai) PTE LTD
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#if defined(ESP32)
#include <Arduino.h>
#include "driver/rmt.h"
// This code is adapted from the ESP-IDF v3.4 RMT "led_strip" example, altered
// to work with the Arduino version of the ESP-IDF (3.2)
#define WS2812_T0H_NS (400)
#define WS2812_T0L_NS (850)
#define WS2812_T1H_NS (800)
#define WS2812_T1L_NS (450)
#define WS2811_T0H_NS (500)
#define WS2811_T0L_NS (2000)
#define WS2811_T1H_NS (1200)
#define WS2811_T1L_NS (1300)
static uint32_t t0h_ticks = 0;
static uint32_t t1h_ticks = 0;
static uint32_t t0l_ticks = 0;
static uint32_t t1l_ticks = 0;
// Limit the number of RMT channels available for the Neopixels. Defaults to all
// channels (8 on ESP32, 4 on ESP32-S2 and S3). Redefining this value will free
// any channels with a higher number for other uses, such as IR send-and-recieve
// libraries. Redefine as 1 to restrict Neopixels to only a single channel.
#define ADAFRUIT_RMT_CHANNEL_MAX RMT_CHANNEL_MAX
#define RMT_LL_HW_BASE (&RMT)
bool rmt_reserved_channels[ADAFRUIT_RMT_CHANNEL_MAX];
static void IRAM_ATTR ws2812_rmt_adapter(const void *src, rmt_item32_t *dest, size_t src_size,
size_t wanted_num, size_t *translated_size, size_t *item_num)
{
if (src == NULL || dest == NULL) {
*translated_size = 0;
*item_num = 0;
return;
}
const rmt_item32_t bit0 = {{{ t0h_ticks, 1, t0l_ticks, 0 }}}; //Logical 0
const rmt_item32_t bit1 = {{{ t1h_ticks, 1, t1l_ticks, 0 }}}; //Logical 1
size_t size = 0;
size_t num = 0;
uint8_t *psrc = (uint8_t *)src;
rmt_item32_t *pdest = dest;
while (size < src_size && num < wanted_num) {
for (int i = 0; i < 8; i++) {
// MSB first
if (*psrc & (1 << (7 - i))) {
pdest->val = bit1.val;
} else {
pdest->val = bit0.val;
}
num++;
pdest++;
}
size++;
psrc++;
}
*translated_size = size;
*item_num = num;
}
void espShow(uint8_t pin, uint8_t *pixels, uint32_t numBytes, boolean is800KHz) {
// Reserve channel
rmt_channel_t channel = ADAFRUIT_RMT_CHANNEL_MAX;
for (size_t i = 0; i < ADAFRUIT_RMT_CHANNEL_MAX; i++) {
if (!rmt_reserved_channels[i]) {
rmt_reserved_channels[i] = true;
channel = i;
}
}
if (channel == ADAFRUIT_RMT_CHANNEL_MAX) {
// Ran out of channels!
return;
}
// Match default TX config from ESP-IDF version 3.4
rmt_config_t config = {
.rmt_mode = RMT_MODE_TX,
.channel = channel,
.gpio_num = pin,
.clk_div = 2,
.mem_block_num = 1,
.tx_config = {
.carrier_freq_hz = 38000,
.carrier_level = RMT_CARRIER_LEVEL_HIGH,
.idle_level = RMT_IDLE_LEVEL_LOW,
.carrier_duty_percent = 33,
.carrier_en = false,
.loop_en = false,
.idle_output_en = true,
}
};
rmt_config(&config);
rmt_driver_install(config.channel, 0, 0);
// Convert NS timings to ticks
uint32_t counter_clk_hz = 0;
// this emulates the rmt_get_counter_clock() function from ESP-IDF 3.4
if (RMT_LL_HW_BASE->conf_ch[config.channel].conf1.ref_always_on == RMT_BASECLK_REF) {
uint32_t div_cnt = RMT_LL_HW_BASE->conf_ch[config.channel].conf0.div_cnt;
uint32_t div = div_cnt == 0 ? 256 : div_cnt;
counter_clk_hz = REF_CLK_FREQ / (div);
} else {
uint32_t div_cnt = RMT_LL_HW_BASE->conf_ch[config.channel].conf0.div_cnt;
uint32_t div = div_cnt == 0 ? 256 : div_cnt;
counter_clk_hz = APB_CLK_FREQ / (div);
}
// NS to tick converter
float ratio = (float)counter_clk_hz / 1e9;
if (is800KHz) {
t0h_ticks = (uint32_t)(ratio * WS2812_T0H_NS);
t0l_ticks = (uint32_t)(ratio * WS2812_T0L_NS);
t1h_ticks = (uint32_t)(ratio * WS2812_T1H_NS);
t1l_ticks = (uint32_t)(ratio * WS2812_T1L_NS);
} else {
t0h_ticks = (uint32_t)(ratio * WS2811_T0H_NS);
t0l_ticks = (uint32_t)(ratio * WS2811_T0L_NS);
t1h_ticks = (uint32_t)(ratio * WS2811_T1H_NS);
t1l_ticks = (uint32_t)(ratio * WS2811_T1L_NS);
}
// Initialize automatic timing translator
rmt_translator_init(config.channel, ws2812_rmt_adapter);
// Write and wait to finish
rmt_write_sample(config.channel, pixels, (size_t)numBytes, true);
rmt_wait_tx_done(config.channel, pdMS_TO_TICKS(100));
// Free channel again
rmt_driver_uninstall(config.channel);
rmt_reserved_channels[channel] = false;
gpio_set_direction(pin, GPIO_MODE_OUTPUT);
}
#endif

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// This is a mash-up of the Due show() code + insights from Michael Miller's
// ESP8266 work for the NeoPixelBus library: github.com/Makuna/NeoPixelBus
// Needs to be a separate .c file to enforce ICACHE_RAM_ATTR execution.
#if defined(ESP8266)
#include <Arduino.h>
#ifdef ESP8266
#include <eagle_soc.h>
#endif
static uint32_t _getCycleCount(void) __attribute__((always_inline));
static inline uint32_t _getCycleCount(void) {
uint32_t ccount;
__asm__ __volatile__("rsr %0,ccount":"=a" (ccount));
return ccount;
}
#ifdef ESP8266
void ICACHE_RAM_ATTR espShow(
uint8_t pin, uint8_t *pixels, uint32_t numBytes, boolean is800KHz) {
#else
void espShow(
uint8_t pin, uint8_t *pixels, uint32_t numBytes, boolean is800KHz) {
#endif
#define CYCLES_800_T0H (F_CPU / 2500000) // 0.4us
#define CYCLES_800_T1H (F_CPU / 1250000) // 0.8us
#define CYCLES_800 (F_CPU / 800000) // 1.25us per bit
#define CYCLES_400_T0H (F_CPU / 2000000) // 0.5uS
#define CYCLES_400_T1H (F_CPU / 833333) // 1.2us
#define CYCLES_400 (F_CPU / 400000) // 2.5us per bit
uint8_t *p, *end, pix, mask;
uint32_t t, time0, time1, period, c, startTime;
#ifdef ESP8266
uint32_t pinMask;
pinMask = _BV(pin);
#endif
p = pixels;
end = p + numBytes;
pix = *p++;
mask = 0x80;
startTime = 0;
#ifdef NEO_KHZ400
if(is800KHz) {
#endif
time0 = CYCLES_800_T0H;
time1 = CYCLES_800_T1H;
period = CYCLES_800;
#ifdef NEO_KHZ400
} else { // 400 KHz bitstream
time0 = CYCLES_400_T0H;
time1 = CYCLES_400_T1H;
period = CYCLES_400;
}
#endif
for(t = time0;; t = time0) {
if(pix & mask) t = time1; // Bit high duration
while(((c = _getCycleCount()) - startTime) < period); // Wait for bit start
#ifdef ESP8266
GPIO_REG_WRITE(GPIO_OUT_W1TS_ADDRESS, pinMask); // Set high
#else
gpio_set_level(pin, HIGH);
#endif
startTime = c; // Save start time
while(((c = _getCycleCount()) - startTime) < t); // Wait high duration
#ifdef ESP8266
GPIO_REG_WRITE(GPIO_OUT_W1TC_ADDRESS, pinMask); // Set low
#else
gpio_set_level(pin, LOW);
#endif
if(!(mask >>= 1)) { // Next bit/byte
if(p >= end) break;
pix = *p++;
mask = 0x80;
}
}
while((_getCycleCount() - startTime) < period); // Wait for last bit
}
#endif // ESP8266

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// This is a mash-up of the Due show() code + insights from Michael Miller's
// ESP8266 work for the NeoPixelBus library: github.com/Makuna/NeoPixelBus
// Needs to be a separate .c file to enforce ICACHE_RAM_ATTR execution.
#if defined(K210)
#define KENDRYTE_K210 1
#endif
#if defined(KENDRYTE_K210)
#include <Arduino.h>
#include "sysctl.h"
void k210Show(
uint8_t pin, uint8_t *pixels, uint32_t numBytes, boolean is800KHz)
{
#define CYCLES_800_T0H (sysctl_clock_get_freq(SYSCTL_CLOCK_CPU) / 2500000) // 0.4us
#define CYCLES_800_T1H (sysctl_clock_get_freq(SYSCTL_CLOCK_CPU) / 1250000) // 0.8us
#define CYCLES_800 (sysctl_clock_get_freq(SYSCTL_CLOCK_CPU) / 800000) // 1.25us per bit
#define CYCLES_400_T0H (sysctl_clock_get_freq(SYSCTL_CLOCK_CPU) / 2000000) // 0.5uS
#define CYCLES_400_T1H (sysctl_clock_get_freq(SYSCTL_CLOCK_CPU) / 833333) // 1.2us
#define CYCLES_400 (sysctl_clock_get_freq(SYSCTL_CLOCK_CPU) / 400000) // 2.5us per bit
uint8_t *p, *end, pix, mask;
uint32_t t, time0, time1, period, c, startTime;
p = pixels;
end = p + numBytes;
pix = *p++;
mask = 0x80;
startTime = 0;
#ifdef NEO_KHZ400
if (is800KHz)
{
#endif
time0 = CYCLES_800_T0H;
time1 = CYCLES_800_T1H;
period = CYCLES_800;
#ifdef NEO_KHZ400
}
else
{ // 400 KHz bitstream
time0 = CYCLES_400_T0H;
time1 = CYCLES_400_T1H;
period = CYCLES_400;
}
#endif
for (t = time0;; t = time0)
{
if (pix & mask)
t = time1; // Bit high duration
while (((c = read_cycle()) - startTime) < period)
; // Wait for bit start
digitalWrite(pin, HIGH);
startTime = c; // Save start time
while (((c = read_cycle()) - startTime) < t)
; // Wait high duration
digitalWrite(pin, LOW);
if (!(mask >>= 1))
{ // Next bit/byte
if (p >= end)
break;
pix = *p++;
mask = 0x80;
}
}
while ((read_cycle() - startTime) < period)
; // Wait for last bit
}
#endif // KENDRYTE_K210

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#######################################
# Syntax Coloring Map For Adafruit_NeoPixel
#######################################
# Class
#######################################
Adafruit_NeoPixel KEYWORD1
#######################################
# Methods and Functions
#######################################
begin KEYWORD2
show KEYWORD2
setPin KEYWORD2
setPixelColor KEYWORD2
fill KEYWORD2
setBrightness KEYWORD2
clear KEYWORD2
updateLength KEYWORD2
updateType KEYWORD2
canShow KEYWORD2
getPixels KEYWORD2
getBrightness KEYWORD2
getPin KEYWORD2
numPixels KEYWORD2
getPixelColor KEYWORD2
sine8 KEYWORD2
gamma8 KEYWORD2
Color KEYWORD2
ColorHSV KEYWORD2
gamma32 KEYWORD2
#######################################
# Constants
#######################################
NEO_COLMASK LITERAL1
NEO_SPDMASK LITERAL1
NEO_KHZ800 LITERAL1
NEO_KHZ400 LITERAL1
NEO_RGB LITERAL1
NEO_RBG LITERAL1
NEO_GRB LITERAL1
NEO_GBR LITERAL1
NEO_BRG LITERAL1
NEO_BGR LITERAL1
NEO_WRGB LITERAL1
NEO_WRBG LITERAL1
NEO_WGRB LITERAL1
NEO_WGBR LITERAL1
NEO_WBRG LITERAL1
NEO_WBGR LITERAL1
NEO_RWGB LITERAL1
NEO_RWBG LITERAL1
NEO_RGWB LITERAL1
NEO_RGBW LITERAL1
NEO_RBWG LITERAL1
NEO_RBGW LITERAL1
NEO_GWRB LITERAL1
NEO_GWBR LITERAL1
NEO_GRWB LITERAL1
NEO_GRBW LITERAL1
NEO_GBWR LITERAL1
NEO_GBRW LITERAL1
NEO_BWRG LITERAL1
NEO_BWGR LITERAL1
NEO_BRWG LITERAL1
NEO_BRGW LITERAL1
NEO_BGWR LITERAL1
NEO_BGRW LITERAL1

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name=Adafruit NeoPixel
version=1.7.0
author=Adafruit
maintainer=Adafruit <info@adafruit.com>
sentence=Arduino library for controlling single-wire-based LED pixels and strip.
paragraph=Arduino library for controlling single-wire-based LED pixels and strip.
category=Display
url=https://github.com/adafruit/Adafruit_NeoPixel
architectures=*

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language: c
sudo: false
before_install:
- source <(curl -SLs https://raw.githubusercontent.com/adafruit/travis-ci-arduino/master/install.sh)
script:
- build_platform esp8266
notifications:
email:
on_success: change
on_failure: change

15
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NTPClient 3.1.0 - 2016.05.31
* Added functions for changing the timeOffset and updateInterval later. Thanks @SirUli
NTPClient 3.0.0 - 2016.04.19
* Constructors now require UDP instance argument, to add support for non-ESP8266 boards
* Added optional begin API to override default local port
* Added end API to close UDP socket
* Changed return type of update and forceUpdate APIs to bool, and return success or failure
* Change return type of getDay, getHours, getMinutes, and getSeconds to int
Older
* Changes not recorded

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/**
* The MIT License (MIT)
* Copyright (c) 2015 by Fabrice Weinberg
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include "NTPClient.h"
NTPClient::NTPClient(UDP& udp) {
this->_udp = &udp;
}
NTPClient::NTPClient(UDP& udp, int timeOffset) {
this->_udp = &udp;
this->_timeOffset = timeOffset;
}
NTPClient::NTPClient(UDP& udp, const char* poolServerName) {
this->_udp = &udp;
this->_poolServerName = poolServerName;
}
NTPClient::NTPClient(UDP& udp, const char* poolServerName, int timeOffset) {
this->_udp = &udp;
this->_timeOffset = timeOffset;
this->_poolServerName = poolServerName;
}
NTPClient::NTPClient(UDP& udp, const char* poolServerName, int timeOffset, unsigned long updateInterval) {
this->_udp = &udp;
this->_timeOffset = timeOffset;
this->_poolServerName = poolServerName;
this->_updateInterval = updateInterval;
}
void NTPClient::begin() {
this->begin(NTP_DEFAULT_LOCAL_PORT);
}
void NTPClient::begin(int port) {
this->_port = port;
this->_udp->begin(this->_port);
this->_udpSetup = true;
}
bool NTPClient::isValid(byte * ntpPacket)
{
//Perform a few validity checks on the packet
if((ntpPacket[0] & 0b11000000) == 0b11000000) //Check for LI=UNSYNC
return false;
if((ntpPacket[0] & 0b00111000) >> 3 < 0b100) //Check for Version >= 4
return false;
if((ntpPacket[0] & 0b00000111) != 0b100) //Check for Mode == Server
return false;
if((ntpPacket[1] < 1) || (ntpPacket[1] > 15)) //Check for valid Stratum
return false;
if( ntpPacket[16] == 0 && ntpPacket[17] == 0 &&
ntpPacket[18] == 0 && ntpPacket[19] == 0 &&
ntpPacket[20] == 0 && ntpPacket[21] == 0 &&
ntpPacket[22] == 0 && ntpPacket[22] == 0) //Check for ReferenceTimestamp != 0
return false;
return true;
}
bool NTPClient::forceUpdate() {
#ifdef DEBUG_NTPClient
Serial.println("Update from NTP Server");
#endif
// flush any existing packets
while(this->_udp->parsePacket() != 0)
this->_udp->flush();
this->sendNTPPacket();
// Wait till data is there or timeout...
byte timeout = 0;
int cb = 0;
do {
delay ( 10 );
cb = this->_udp->parsePacket();
if(cb > 0)
{
this->_udp->read(this->_packetBuffer, NTP_PACKET_SIZE);
if(!this->isValid(this->_packetBuffer))
cb = 0;
}
if (timeout > 100) return false; // timeout after 1000 ms
timeout++;
} while (cb == 0);
this->_lastUpdate = millis() - (10 * (timeout + 1)); // Account for delay in reading the time
unsigned long highWord = word(this->_packetBuffer[40], this->_packetBuffer[41]);
unsigned long lowWord = word(this->_packetBuffer[42], this->_packetBuffer[43]);
// combine the four bytes (two words) into a long integer
// this is NTP time (seconds since Jan 1 1900):
unsigned long secsSince1900 = highWord << 16 | lowWord;
this->_currentEpoc = secsSince1900 - SEVENZYYEARS;
return true;
}
bool NTPClient::update() {
if ((millis() - this->_lastUpdate >= this->_updateInterval) // Update after _updateInterval
|| this->_lastUpdate == 0) { // Update if there was no update yet.
if (!this->_udpSetup) this->begin(); // setup the UDP client if needed
return this->forceUpdate();
}
return true;
}
unsigned long NTPClient::getEpochTime() {
return this->_timeOffset + // User offset
this->_currentEpoc + // Epoc returned by the NTP server
((millis() - this->_lastUpdate) / 1000); // Time since last update
}
int NTPClient::getDay() {
return (((this->getEpochTime() / 86400L) + 4 ) % 7); //0 is Sunday
}
int NTPClient::getHours() {
return ((this->getEpochTime() % 86400L) / 3600);
}
int NTPClient::getMinutes() {
return ((this->getEpochTime() % 3600) / 60);
}
int NTPClient::getSeconds() {
return (this->getEpochTime() % 60);
}
String NTPClient::getFormattedTime(unsigned long secs) {
unsigned long rawTime = secs ? secs : this->getEpochTime();
unsigned int hours = (rawTime % 86400L) / 3600;
unsigned int minutes = (rawTime % 3600) / 60;
unsigned int seconds = rawTime % 60;
char formatted_time[9];
snprintf(formatted_time, sizeof(formatted_time), "%02d:%02d:%02d", hours, minutes, seconds);
return String(formatted_time);
}
// Based on https://github.com/PaulStoffregen/Time/blob/master/Time.cpp
String NTPClient::getFormattedDate(unsigned long secs) {
unsigned long rawTime = (secs ? secs : this->getEpochTime()) / 86400L; // in days
unsigned long days = 0, year = 1970;
uint8_t month;
static const uint8_t monthDays[]={31,28,31,30,31,30,31,31,30,31,30,31};
while((days += (LEAP_YEAR(year) ? 366 : 365)) <= rawTime)
year++;
rawTime -= days - (LEAP_YEAR(year) ? 366 : 365); // now it is days in this year, starting at 0
days=0;
for (month=0; month<12; month++) {
uint8_t monthLength;
if (month==1) { // february
monthLength = LEAP_YEAR(year) ? 29 : 28;
} else {
monthLength = monthDays[month];
}
if (rawTime < monthLength) break;
rawTime -= monthLength;
}
month++; // jan is month 1
rawTime++; // first day is day 1
char formatted_date[23];
snprintf(formatted_date, sizeof(formatted_date), "%4lu-%02d-%02lu %s%+03d",
year, month, rawTime, this->getFormattedTime(secs).c_str(), this->_timeOffset / 3600);
return String(formatted_date);
}
void NTPClient::end() {
this->_udp->stop();
this->_udpSetup = false;
}
void NTPClient::setTimeOffset(int timeOffset) {
this->_timeOffset = timeOffset;
}
void NTPClient::setUpdateInterval(unsigned long updateInterval) {
this->_updateInterval = updateInterval;
}
void NTPClient::sendNTPPacket() {
// set all bytes in the buffer to 0
memset(this->_packetBuffer, 0, NTP_PACKET_SIZE);
// Initialize values needed to form NTP request
// (see URL above for details on the packets)
this->_packetBuffer[0] = 0b11100011; // LI, Version, Mode
this->_packetBuffer[1] = 0; // Stratum, or type of clock
this->_packetBuffer[2] = 6; // Polling Interval
this->_packetBuffer[3] = 0xEC; // Peer Clock Precision
// 8 bytes of zero for Root Delay & Root Dispersion
this->_packetBuffer[12] = 0x49;
this->_packetBuffer[13] = 0x4E;
this->_packetBuffer[14] = 0x49;
this->_packetBuffer[15] = 0x52;
// all NTP fields have been given values, now
// you can send a packet requesting a timestamp:
this->_udp->beginPacket(this->_poolServerName, 123); //NTP requests are to port 123
this->_udp->write(this->_packetBuffer, NTP_PACKET_SIZE);
this->_udp->endPacket();
}
void NTPClient::setEpochTime(unsigned long secs) {
this->_currentEpoc = secs;
}

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#pragma once
#include "Arduino.h"
#include <Udp.h>
#define SEVENZYYEARS 2208988800UL
#define NTP_PACKET_SIZE 48
#define NTP_DEFAULT_LOCAL_PORT 1337
#define LEAP_YEAR(Y) ( (Y>0) && !(Y%4) && ( (Y%100) || !(Y%400) ) )
class NTPClient {
private:
UDP* _udp;
bool _udpSetup = false;
const char* _poolServerName = "pool.ntp.org"; // Default time server
int _port = NTP_DEFAULT_LOCAL_PORT;
int _timeOffset = 0;
unsigned long _updateInterval = 60000; // In ms
unsigned long _currentEpoc = 0; // In s
unsigned long _lastUpdate = 0; // In ms
byte _packetBuffer[NTP_PACKET_SIZE];
void sendNTPPacket();
bool isValid(byte * ntpPacket);
public:
NTPClient(UDP& udp);
NTPClient(UDP& udp, int timeOffset);
NTPClient(UDP& udp, const char* poolServerName);
NTPClient(UDP& udp, const char* poolServerName, int timeOffset);
NTPClient(UDP& udp, const char* poolServerName, int timeOffset, unsigned long updateInterval);
/**
* Starts the underlying UDP client with the default local port
*/
void begin();
/**
* Starts the underlying UDP client with the specified local port
*/
void begin(int port);
/**
* This should be called in the main loop of your application. By default an update from the NTP Server is only
* made every 60 seconds. This can be configured in the NTPClient constructor.
*
* @return true on success, false on failure
*/
bool update();
/**
* This will force the update from the NTP Server.
*
* @return true on success, false on failure
*/
bool forceUpdate();
int getDay();
int getHours();
int getMinutes();
int getSeconds();
/**
* Changes the time offset. Useful for changing timezones dynamically
*/
void setTimeOffset(int timeOffset);
/**
* Set the update interval to another frequency. E.g. useful when the
* timeOffset should not be set in the constructor
*/
void setUpdateInterval(unsigned long updateInterval);
/**
* @return secs argument (or 0 for current time) formatted like `hh:mm:ss`
*/
String getFormattedTime(unsigned long secs = 0);
/**
* @return time in seconds since Jan. 1, 1970
*/
unsigned long getEpochTime();
/**
* @return secs argument (or 0 for current date) formatted to ISO 8601
* like `2004-02-12T15:19:21+00:00`
*/
String getFormattedDate(unsigned long secs = 0);
/**
* Stops the underlying UDP client
*/
void end();
/**
* Replace the NTP-fetched time with seconds since Jan. 1, 1970
*/
void setEpochTime(unsigned long secs);
};

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# NTPClient
[![Build Status](https://travis-ci.org/arduino-libraries/NTPClient.svg?branch=master)](https://travis-ci.org/arduino-libraries/NTPClient)
Connect to a NTP server, here is how:
```cpp
#include <NTPClient.h>
// change next line to use with another board/shield
#include <ESP8266WiFi.h>
//#include <WiFi.h> // for WiFi shield
//#include <WiFi101.h> // for WiFi 101 shield or MKR1000
#include <WiFiUdp.h>
const char *ssid = "<SSID>";
const char *password = "<PASSWORD>";
WiFiUDP ntpUDP;
// By default 'pool.ntp.org' is used with 60 seconds update interval and
// no offset
NTPClient timeClient(ntpUDP);
// You can specify the time server pool and the offset, (in seconds)
// additionaly you can specify the update interval (in milliseconds).
// NTPClient timeClient(ntpUDP, "europe.pool.ntp.org", 3600, 60000);
void setup(){
Serial.begin(115200);
WiFi.begin(ssid, password);
while ( WiFi.status() != WL_CONNECTED ) {
delay ( 500 );
Serial.print ( "." );
}
timeClient.begin();
}
void loop() {
timeClient.update();
Serial.println(timeClient.getFormattedTime());
delay(1000);
}
```

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#######################################
# Datatypes (KEYWORD1)
#######################################
NTPClient KEYWORD1
#######################################
# Methods and Functions (KEYWORD2)
#######################################
begin KEYWORD2
end KEYWORD2
update KEYWORD2
forceUpdate KEYWORD2
getDay KEYWORD2
getHours KEYWORD2
getMinutes KEYWORD2
getSeconds KEYWORD2
getFormattedTime KEYWORD2
getEpochTime KEYWORD2

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{
"name": "NTPClient",
"keywords": "ntp, client, time",
"description": "A NTPClient to connect to a time server",
"authors":
[
{
"name": "Fabrice Weinberg",
"email": "fabrice@weinberg.me"
},
{
"name": "Sandeep Mistry",
"email": "s.mistry@arduino.cc"
}
],
"repository":
{
"type": "git",
"url": "https://github.com/arduino-libraries/NTPClient.git"
},
"version": "3.1.0",
"frameworks": "arduino",
"platforms": "espressif"
}

9
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name=NTPClient
version=3.1.0
author=Fabrice Weinberg
maintainer=Fabrice Weinberg <fabrice@weinberg.me>
sentence=An NTPClient to connect to a time server
paragraph=Get time from a NTP server and keep it in sync.
category=Timing
url=https://github.com/arduino-libraries/NTPClient
architectures=*

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2.8
* Add setBufferSize() to override MQTT_MAX_PACKET_SIZE
* Add setKeepAlive() to override MQTT_KEEPALIVE
* Add setSocketTimeout() to overide MQTT_SOCKET_TIMEOUT
* Added check to prevent subscribe/unsubscribe to empty topics
* Declare wifi mode prior to connect in ESP example
* Use `strnlen` to avoid overruns
* Support pre-connected Client objects
2.7
* Fix remaining-length handling to prevent buffer overrun
* Add large-payload API - beginPublish/write/publish/endPublish
* Add yield call to improve reliability on ESP
* Add Clean Session flag to connect options
* Add ESP32 support for functional callback signature
* Various other fixes
2.4
* Add MQTT_SOCKET_TIMEOUT to prevent it blocking indefinitely
whilst waiting for inbound data
* Fixed return code when publishing >256 bytes
2.3
* Add publish(topic,payload,retained) function
2.2
* Change code layout to match Arduino Library reqs
2.1
* Add MAX_TRANSFER_SIZE def to chunk messages if needed
* Reject topic/payloads that exceed MQTT_MAX_PACKET_SIZE
2.0
* Add (and default to) MQTT 3.1.1 support
* Fix PROGMEM handling for Intel Galileo/ESP8266
* Add overloaded constructors for convenience
* Add chainable setters for server/callback/client/stream
* Add state function to return connack return code
1.9
* Do not split MQTT packets over multiple calls to _client->write()
* API change: All constructors now require an instance of Client
to be passed in.
* Fixed example to match 1.8 api changes - dpslwk
* Added username/password support - WilHall
* Added publish_P - publishes messages from PROGMEM - jobytaffey
1.8
* KeepAlive interval is configurable in PubSubClient.h
* Maximum packet size is configurable in PubSubClient.h
* API change: Return boolean rather than int from various functions
* API change: Length parameter in message callback changed
from int to unsigned int
* Various internal tidy-ups around types
1.7
* Improved keepalive handling
* Updated to the Arduino-1.0 API
1.6
* Added the ability to publish a retained message
1.5
* Added default constructor
* Fixed compile error when used with arduino-0021 or later
1.4
* Fixed connection lost handling
1.3
* Fixed packet reading bug in PubSubClient.readPacket
1.2
* Fixed compile error when used with arduino-0016 or later
1.1
* Reduced size of library
* Added support for Will messages
* Clarified licensing - see LICENSE.txt
1.0
* Only Quality of Service (QOS) 0 messaging is supported
* The maximum message size, including header, is 128 bytes
* The keepalive interval is set to 30 seconds
* No support for Will messages

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Copyright (c) 2008-2020 Nicholas O'Leary
Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:
The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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# Arduino Client for MQTT
This library provides a client for doing simple publish/subscribe messaging with
a server that supports MQTT.
## Examples
The library comes with a number of example sketches. See File > Examples > PubSubClient
within the Arduino application.
Full API documentation is available here: https://pubsubclient.knolleary.net
## Limitations
- It can only publish QoS 0 messages. It can subscribe at QoS 0 or QoS 1.
- The maximum message size, including header, is **256 bytes** by default. This
is configurable via `MQTT_MAX_PACKET_SIZE` in `PubSubClient.h` or can be changed
by calling `PubSubClient::setBufferSize(size)`.
- The keepalive interval is set to 15 seconds by default. This is configurable
via `MQTT_KEEPALIVE` in `PubSubClient.h` or can be changed by calling
`PubSubClient::setKeepAlive(keepAlive)`.
- The client uses MQTT 3.1.1 by default. It can be changed to use MQTT 3.1 by
changing value of `MQTT_VERSION` in `PubSubClient.h`.
## Compatible Hardware
The library uses the Arduino Ethernet Client api for interacting with the
underlying network hardware. This means it Just Works with a growing number of
boards and shields, including:
- Arduino Ethernet
- Arduino Ethernet Shield
- Arduino YUN – use the included `YunClient` in place of `EthernetClient`, and
be sure to do a `Bridge.begin()` first
- Arduino WiFi Shield - if you want to send packets > 90 bytes with this shield,
enable the `MQTT_MAX_TRANSFER_SIZE` define in `PubSubClient.h`.
- Sparkfun WiFly Shield – [library](https://github.com/dpslwk/WiFly)
- TI CC3000 WiFi - [library](https://github.com/sparkfun/SFE_CC3000_Library)
- Intel Galileo/Edison
- ESP8266
- ESP32
The library cannot currently be used with hardware based on the ENC28J60 chip –
such as the Nanode or the Nuelectronics Ethernet Shield. For those, there is an
[alternative library](https://github.com/njh/NanodeMQTT) available.
## License
This code is released under the MIT License.

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#######################################
# Syntax Coloring Map For PubSubClient
#######################################
#######################################
# Datatypes (KEYWORD1)
#######################################
PubSubClient KEYWORD1
#######################################
# Methods and Functions (KEYWORD2)
#######################################
connect KEYWORD2
disconnect KEYWORD2
publish KEYWORD2
publish_P KEYWORD2
beginPublish KEYWORD2
endPublish KEYWORD2
write KEYWORD2
subscribe KEYWORD2
unsubscribe KEYWORD2
loop KEYWORD2
connected KEYWORD2
setServer KEYWORD2
setCallback KEYWORD2
setClient KEYWORD2
setStream KEYWORD2
setKeepAlive KEYWORD2
setBufferSize KEYWORD2
setSocketTimeout KEYWORD2
#######################################
# Constants (LITERAL1)
#######################################

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{
"name": "PubSubClient",
"keywords": "ethernet, mqtt, m2m, iot",
"description": "A client library for MQTT messaging. MQTT is a lightweight messaging protocol ideal for small devices. This library allows you to send and receive MQTT messages. It supports the latest MQTT 3.1.1 protocol and can be configured to use the older MQTT 3.1 if needed. It supports all Arduino Ethernet Client compatible hardware, including the Intel Galileo/Edison, ESP8266 and TI CC3000.",
"repository": {
"type": "git",
"url": "https://github.com/knolleary/pubsubclient.git"
},
"version": "2.8",
"exclude": "tests",
"examples": "examples/*/*.ino",
"frameworks": "arduino",
"platforms": [
"atmelavr",
"espressif8266",
"espressif32"
]
}

9
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name=PubSubClient
version=2.8
author=Nick O'Leary <nick.oleary@gmail.com>
maintainer=Nick O'Leary <nick.oleary@gmail.com>
sentence=A client library for MQTT messaging.
paragraph=MQTT is a lightweight messaging protocol ideal for small devices. This library allows you to send and receive MQTT messages. It supports the latest MQTT 3.1.1 protocol and can be configured to use the older MQTT 3.1 if needed. It supports all Arduino Ethernet Client compatible hardware, including the Intel Galileo/Edison, ESP8266 and TI CC3000.
category=Communication
url=http://pubsubclient.knolleary.net
architectures=*

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/*
PubSubClient.cpp - A simple client for MQTT.
Nick O'Leary
http://knolleary.net
*/
#include "PubSubClient.h"
#include "Arduino.h"
PubSubClient::PubSubClient() {
this->_state = MQTT_DISCONNECTED;
this->_client = NULL;
this->stream = NULL;
setCallback(NULL);
this->bufferSize = 0;
setBufferSize(MQTT_MAX_PACKET_SIZE);
setKeepAlive(MQTT_KEEPALIVE);
setSocketTimeout(MQTT_SOCKET_TIMEOUT);
}
PubSubClient::PubSubClient(Client& client) {
this->_state = MQTT_DISCONNECTED;
setClient(client);
this->stream = NULL;
this->bufferSize = 0;
setBufferSize(MQTT_MAX_PACKET_SIZE);
setKeepAlive(MQTT_KEEPALIVE);
setSocketTimeout(MQTT_SOCKET_TIMEOUT);
}
PubSubClient::PubSubClient(IPAddress addr, uint16_t port, Client& client) {
this->_state = MQTT_DISCONNECTED;
setServer(addr, port);
setClient(client);
this->stream = NULL;
this->bufferSize = 0;
setBufferSize(MQTT_MAX_PACKET_SIZE);
setKeepAlive(MQTT_KEEPALIVE);
setSocketTimeout(MQTT_SOCKET_TIMEOUT);
}
PubSubClient::PubSubClient(IPAddress addr, uint16_t port, Client& client, Stream& stream) {
this->_state = MQTT_DISCONNECTED;
setServer(addr,port);
setClient(client);
setStream(stream);
this->bufferSize = 0;
setBufferSize(MQTT_MAX_PACKET_SIZE);
setKeepAlive(MQTT_KEEPALIVE);
setSocketTimeout(MQTT_SOCKET_TIMEOUT);
}
PubSubClient::PubSubClient(IPAddress addr, uint16_t port, MQTT_CALLBACK_SIGNATURE, Client& client) {
this->_state = MQTT_DISCONNECTED;
setServer(addr, port);
setCallback(callback);
setClient(client);
this->stream = NULL;
this->bufferSize = 0;
setBufferSize(MQTT_MAX_PACKET_SIZE);
setKeepAlive(MQTT_KEEPALIVE);
setSocketTimeout(MQTT_SOCKET_TIMEOUT);
}
PubSubClient::PubSubClient(IPAddress addr, uint16_t port, MQTT_CALLBACK_SIGNATURE, Client& client, Stream& stream) {
this->_state = MQTT_DISCONNECTED;
setServer(addr,port);
setCallback(callback);
setClient(client);
setStream(stream);
this->bufferSize = 0;
setBufferSize(MQTT_MAX_PACKET_SIZE);
setKeepAlive(MQTT_KEEPALIVE);
setSocketTimeout(MQTT_SOCKET_TIMEOUT);
}
PubSubClient::PubSubClient(uint8_t *ip, uint16_t port, Client& client) {
this->_state = MQTT_DISCONNECTED;
setServer(ip, port);
setClient(client);
this->stream = NULL;
this->bufferSize = 0;
setBufferSize(MQTT_MAX_PACKET_SIZE);
setKeepAlive(MQTT_KEEPALIVE);
setSocketTimeout(MQTT_SOCKET_TIMEOUT);
}
PubSubClient::PubSubClient(uint8_t *ip, uint16_t port, Client& client, Stream& stream) {
this->_state = MQTT_DISCONNECTED;
setServer(ip,port);
setClient(client);
setStream(stream);
this->bufferSize = 0;
setBufferSize(MQTT_MAX_PACKET_SIZE);
setKeepAlive(MQTT_KEEPALIVE);
setSocketTimeout(MQTT_SOCKET_TIMEOUT);
}
PubSubClient::PubSubClient(uint8_t *ip, uint16_t port, MQTT_CALLBACK_SIGNATURE, Client& client) {
this->_state = MQTT_DISCONNECTED;
setServer(ip, port);
setCallback(callback);
setClient(client);
this->stream = NULL;
this->bufferSize = 0;
setBufferSize(MQTT_MAX_PACKET_SIZE);
setKeepAlive(MQTT_KEEPALIVE);
setSocketTimeout(MQTT_SOCKET_TIMEOUT);
}
PubSubClient::PubSubClient(uint8_t *ip, uint16_t port, MQTT_CALLBACK_SIGNATURE, Client& client, Stream& stream) {
this->_state = MQTT_DISCONNECTED;
setServer(ip,port);
setCallback(callback);
setClient(client);
setStream(stream);
this->bufferSize = 0;
setBufferSize(MQTT_MAX_PACKET_SIZE);
setKeepAlive(MQTT_KEEPALIVE);
setSocketTimeout(MQTT_SOCKET_TIMEOUT);
}
PubSubClient::PubSubClient(const char* domain, uint16_t port, Client& client) {
this->_state = MQTT_DISCONNECTED;
setServer(domain,port);
setClient(client);
this->stream = NULL;
this->bufferSize = 0;
setBufferSize(MQTT_MAX_PACKET_SIZE);
setKeepAlive(MQTT_KEEPALIVE);
setSocketTimeout(MQTT_SOCKET_TIMEOUT);
}
PubSubClient::PubSubClient(const char* domain, uint16_t port, Client& client, Stream& stream) {
this->_state = MQTT_DISCONNECTED;
setServer(domain,port);
setClient(client);
setStream(stream);
this->bufferSize = 0;
setBufferSize(MQTT_MAX_PACKET_SIZE);
setKeepAlive(MQTT_KEEPALIVE);
setSocketTimeout(MQTT_SOCKET_TIMEOUT);
}
PubSubClient::PubSubClient(const char* domain, uint16_t port, MQTT_CALLBACK_SIGNATURE, Client& client) {
this->_state = MQTT_DISCONNECTED;
setServer(domain,port);
setCallback(callback);
setClient(client);
this->stream = NULL;
this->bufferSize = 0;
setBufferSize(MQTT_MAX_PACKET_SIZE);
setKeepAlive(MQTT_KEEPALIVE);
setSocketTimeout(MQTT_SOCKET_TIMEOUT);
}
PubSubClient::PubSubClient(const char* domain, uint16_t port, MQTT_CALLBACK_SIGNATURE, Client& client, Stream& stream) {
this->_state = MQTT_DISCONNECTED;
setServer(domain,port);
setCallback(callback);
setClient(client);
setStream(stream);
this->bufferSize = 0;
setBufferSize(MQTT_MAX_PACKET_SIZE);
setKeepAlive(MQTT_KEEPALIVE);
setSocketTimeout(MQTT_SOCKET_TIMEOUT);
}
PubSubClient::~PubSubClient() {
free(this->buffer);
}
boolean PubSubClient::connect(const char *id) {
return connect(id,NULL,NULL,0,0,0,0,1);
}
boolean PubSubClient::connect(const char *id, const char *user, const char *pass) {
return connect(id,user,pass,0,0,0,0,1);
}
boolean PubSubClient::connect(const char *id, const char* willTopic, uint8_t willQos, boolean willRetain, const char* willMessage) {
return connect(id,NULL,NULL,willTopic,willQos,willRetain,willMessage,1);
}
boolean PubSubClient::connect(const char *id, const char *user, const char *pass, const char* willTopic, uint8_t willQos, boolean willRetain, const char* willMessage) {
return connect(id,user,pass,willTopic,willQos,willRetain,willMessage,1);
}
boolean PubSubClient::connect(const char *id, const char *user, const char *pass, const char* willTopic, uint8_t willQos, boolean willRetain, const char* willMessage, boolean cleanSession) {
if (!connected()) {
int result = 0;
if(_client->connected()) {
result = 1;
} else {
if (domain != NULL) {
result = _client->connect(this->domain, this->port);
} else {
result = _client->connect(this->ip, this->port);
}
}
if (result == 1) {
nextMsgId = 1;
// Leave room in the buffer for header and variable length field
uint16_t length = MQTT_MAX_HEADER_SIZE;
unsigned int j;
#if MQTT_VERSION == MQTT_VERSION_3_1
uint8_t d[9] = {0x00,0x06,'M','Q','I','s','d','p', MQTT_VERSION};
#define MQTT_HEADER_VERSION_LENGTH 9
#elif MQTT_VERSION == MQTT_VERSION_3_1_1
uint8_t d[7] = {0x00,0x04,'M','Q','T','T',MQTT_VERSION};
#define MQTT_HEADER_VERSION_LENGTH 7
#endif
for (j = 0;j<MQTT_HEADER_VERSION_LENGTH;j++) {
this->buffer[length++] = d[j];
}
uint8_t v;
if (willTopic) {
v = 0x04|(willQos<<3)|(willRetain<<5);
} else {
v = 0x00;
}
if (cleanSession) {
v = v|0x02;
}
if(user != NULL) {
v = v|0x80;
if(pass != NULL) {
v = v|(0x80>>1);
}
}
this->buffer[length++] = v;
this->buffer[length++] = ((this->keepAlive) >> 8);
this->buffer[length++] = ((this->keepAlive) & 0xFF);
CHECK_STRING_LENGTH(length,id)
length = writeString(id,this->buffer,length);
if (willTopic) {
CHECK_STRING_LENGTH(length,willTopic)
length = writeString(willTopic,this->buffer,length);
CHECK_STRING_LENGTH(length,willMessage)
length = writeString(willMessage,this->buffer,length);
}
if(user != NULL) {
CHECK_STRING_LENGTH(length,user)
length = writeString(user,this->buffer,length);
if(pass != NULL) {
CHECK_STRING_LENGTH(length,pass)
length = writeString(pass,this->buffer,length);
}
}
write(MQTTCONNECT,this->buffer,length-MQTT_MAX_HEADER_SIZE);
lastInActivity = lastOutActivity = millis();
while (!_client->available()) {
unsigned long t = millis();
if (t-lastInActivity >= ((int32_t) this->socketTimeout*1000UL)) {
_state = MQTT_CONNECTION_TIMEOUT;
_client->stop();
return false;
}
}
uint8_t llen;
uint32_t len = readPacket(&llen);
if (len == 4) {
if (buffer[3] == 0) {
lastInActivity = millis();
pingOutstanding = false;
_state = MQTT_CONNECTED;
return true;
} else {
_state = buffer[3];
}
}
_client->stop();
} else {
_state = MQTT_CONNECT_FAILED;
}
return false;
}
return true;
}
// reads a byte into result
boolean PubSubClient::readByte(uint8_t * result) {
uint32_t previousMillis = millis();
while(!_client->available()) {
yield();
uint32_t currentMillis = millis();
if(currentMillis - previousMillis >= ((int32_t) this->socketTimeout * 1000)){
return false;
}
}
*result = _client->read();
return true;
}
// reads a byte into result[*index] and increments index
boolean PubSubClient::readByte(uint8_t * result, uint16_t * index){
uint16_t current_index = *index;
uint8_t * write_address = &(result[current_index]);
if(readByte(write_address)){
*index = current_index + 1;
return true;
}
return false;
}
uint32_t PubSubClient::readPacket(uint8_t* lengthLength) {
uint16_t len = 0;
if(!readByte(this->buffer, &len)) return 0;
bool isPublish = (this->buffer[0]&0xF0) == MQTTPUBLISH;
uint32_t multiplier = 1;
uint32_t length = 0;
uint8_t digit = 0;
uint16_t skip = 0;
uint32_t start = 0;
do {
if (len == 5) {
// Invalid remaining length encoding - kill the connection
_state = MQTT_DISCONNECTED;
_client->stop();
return 0;
}
if(!readByte(&digit)) return 0;
this->buffer[len++] = digit;
length += (digit & 127) * multiplier;
multiplier <<=7; //multiplier *= 128
} while ((digit & 128) != 0);
*lengthLength = len-1;
if (isPublish) {
// Read in topic length to calculate bytes to skip over for Stream writing
if(!readByte(this->buffer, &len)) return 0;
if(!readByte(this->buffer, &len)) return 0;
skip = (this->buffer[*lengthLength+1]<<8)+this->buffer[*lengthLength+2];
start = 2;
if (this->buffer[0]&MQTTQOS1) {
// skip message id
skip += 2;
}
}
uint32_t idx = len;
for (uint32_t i = start;i<length;i++) {
if(!readByte(&digit)) return 0;
if (this->stream) {
if (isPublish && idx-*lengthLength-2>skip) {
this->stream->write(digit);
}
}
if (len < this->bufferSize) {
this->buffer[len] = digit;
len++;
}
idx++;
}
if (!this->stream && idx > this->bufferSize) {
len = 0; // This will cause the packet to be ignored.
}
return len;
}
boolean PubSubClient::loop() {
if (connected()) {
unsigned long t = millis();
if ((t - lastInActivity > this->keepAlive*1000UL) || (t - lastOutActivity > this->keepAlive*1000UL)) {
if (pingOutstanding) {
this->_state = MQTT_CONNECTION_TIMEOUT;
_client->stop();
return false;
} else {
this->buffer[0] = MQTTPINGREQ;
this->buffer[1] = 0;
_client->write(this->buffer,2);
lastOutActivity = t;
lastInActivity = t;
pingOutstanding = true;
}
}
if (_client->available()) {
uint8_t llen;
uint16_t len = readPacket(&llen);
uint16_t msgId = 0;
uint8_t *payload;
if (len > 0) {
lastInActivity = t;
uint8_t type = this->buffer[0]&0xF0;
if (type == MQTTPUBLISH) {
if (callback) {
uint16_t tl = (this->buffer[llen+1]<<8)+this->buffer[llen+2]; /* topic length in bytes */
memmove(this->buffer+llen+2,this->buffer+llen+3,tl); /* move topic inside buffer 1 byte to front */
this->buffer[llen+2+tl] = 0; /* end the topic as a 'C' string with \x00 */
char *topic = (char*) this->buffer+llen+2;
// msgId only present for QOS>0
if ((this->buffer[0]&0x06) == MQTTQOS1) {
msgId = (this->buffer[llen+3+tl]<<8)+this->buffer[llen+3+tl+1];
payload = this->buffer+llen+3+tl+2;
callback(topic,payload,len-llen-3-tl-2);
this->buffer[0] = MQTTPUBACK;
this->buffer[1] = 2;
this->buffer[2] = (msgId >> 8);
this->buffer[3] = (msgId & 0xFF);
_client->write(this->buffer,4);
lastOutActivity = t;
} else {
payload = this->buffer+llen+3+tl;
callback(topic,payload,len-llen-3-tl);
}
}
} else if (type == MQTTPINGREQ) {
this->buffer[0] = MQTTPINGRESP;
this->buffer[1] = 0;
_client->write(this->buffer,2);
} else if (type == MQTTPINGRESP) {
pingOutstanding = false;
}
} else if (!connected()) {
// readPacket has closed the connection
return false;
}
}
return true;
}
return false;
}
boolean PubSubClient::publish(const char* topic, const char* payload) {
return publish(topic,(const uint8_t*)payload, payload ? strnlen(payload, this->bufferSize) : 0,false);
}
boolean PubSubClient::publish(const char* topic, const char* payload, boolean retained) {
return publish(topic,(const uint8_t*)payload, payload ? strnlen(payload, this->bufferSize) : 0,retained);
}
boolean PubSubClient::publish(const char* topic, const uint8_t* payload, unsigned int plength) {
return publish(topic, payload, plength, false);
}
boolean PubSubClient::publish(const char* topic, const uint8_t* payload, unsigned int plength, boolean retained) {
if (connected()) {
if (this->bufferSize < MQTT_MAX_HEADER_SIZE + 2+strnlen(topic, this->bufferSize) + plength) {
// Too long
return false;
}
// Leave room in the buffer for header and variable length field
uint16_t length = MQTT_MAX_HEADER_SIZE;
length = writeString(topic,this->buffer,length);
// Add payload
uint16_t i;
for (i=0;i<plength;i++) {
this->buffer[length++] = payload[i];
}
// Write the header
uint8_t header = MQTTPUBLISH;
if (retained) {
header |= 1;
}
return write(header,this->buffer,length-MQTT_MAX_HEADER_SIZE);
}
return false;
}
boolean PubSubClient::publish_P(const char* topic, const char* payload, boolean retained) {
return publish_P(topic, (const uint8_t*)payload, payload ? strnlen(payload, this->bufferSize) : 0, retained);
}
boolean PubSubClient::publish_P(const char* topic, const uint8_t* payload, unsigned int plength, boolean retained) {
uint8_t llen = 0;
uint8_t digit;
unsigned int rc = 0;
uint16_t tlen;
unsigned int pos = 0;
unsigned int i;
uint8_t header;
unsigned int len;
int expectedLength;
if (!connected()) {
return false;
}
tlen = strnlen(topic, this->bufferSize);
header = MQTTPUBLISH;
if (retained) {
header |= 1;
}
this->buffer[pos++] = header;
len = plength + 2 + tlen;
do {
digit = len & 127; //digit = len %128
len >>= 7; //len = len / 128
if (len > 0) {
digit |= 0x80;
}
this->buffer[pos++] = digit;
llen++;
} while(len>0);
pos = writeString(topic,this->buffer,pos);
rc += _client->write(this->buffer,pos);
for (i=0;i<plength;i++) {
rc += _client->write((char)pgm_read_byte_near(payload + i));
}
lastOutActivity = millis();
expectedLength = 1 + llen + 2 + tlen + plength;
return (rc == expectedLength);
}
boolean PubSubClient::beginPublish(const char* topic, unsigned int plength, boolean retained) {
if (connected()) {
// Send the header and variable length field
uint16_t length = MQTT_MAX_HEADER_SIZE;
length = writeString(topic,this->buffer,length);
uint8_t header = MQTTPUBLISH;
if (retained) {
header |= 1;
}
size_t hlen = buildHeader(header, this->buffer, plength+length-MQTT_MAX_HEADER_SIZE);
uint16_t rc = _client->write(this->buffer+(MQTT_MAX_HEADER_SIZE-hlen),length-(MQTT_MAX_HEADER_SIZE-hlen));
lastOutActivity = millis();
return (rc == (length-(MQTT_MAX_HEADER_SIZE-hlen)));
}
return false;
}
int PubSubClient::endPublish() {
return 1;
}
size_t PubSubClient::write(uint8_t data) {
lastOutActivity = millis();
return _client->write(data);
}
size_t PubSubClient::write(const uint8_t *buffer, size_t size) {
lastOutActivity = millis();
return _client->write(buffer,size);
}
size_t PubSubClient::buildHeader(uint8_t header, uint8_t* buf, uint16_t length) {
uint8_t lenBuf[4];
uint8_t llen = 0;
uint8_t digit;
uint8_t pos = 0;
uint16_t len = length;
do {
digit = len & 127; //digit = len %128
len >>= 7; //len = len / 128
if (len > 0) {
digit |= 0x80;
}
lenBuf[pos++] = digit;
llen++;
} while(len>0);
buf[4-llen] = header;
for (int i=0;i<llen;i++) {
buf[MQTT_MAX_HEADER_SIZE-llen+i] = lenBuf[i];
}
return llen+1; // Full header size is variable length bit plus the 1-byte fixed header
}
boolean PubSubClient::write(uint8_t header, uint8_t* buf, uint16_t length) {
uint16_t rc;
uint8_t hlen = buildHeader(header, buf, length);
#ifdef MQTT_MAX_TRANSFER_SIZE
uint8_t* writeBuf = buf+(MQTT_MAX_HEADER_SIZE-hlen);
uint16_t bytesRemaining = length+hlen; //Match the length type
uint8_t bytesToWrite;
boolean result = true;
while((bytesRemaining > 0) && result) {
bytesToWrite = (bytesRemaining > MQTT_MAX_TRANSFER_SIZE)?MQTT_MAX_TRANSFER_SIZE:bytesRemaining;
rc = _client->write(writeBuf,bytesToWrite);
result = (rc == bytesToWrite);
bytesRemaining -= rc;
writeBuf += rc;
}
return result;
#else
rc = _client->write(buf+(MQTT_MAX_HEADER_SIZE-hlen),length+hlen);
lastOutActivity = millis();
return (rc == hlen+length);
#endif
}
boolean PubSubClient::subscribe(const char* topic) {
return subscribe(topic, 0);
}
boolean PubSubClient::subscribe(const char* topic, uint8_t qos) {
size_t topicLength = strnlen(topic, this->bufferSize);
if (topic == 0) {
return false;
}
if (qos > 1) {
return false;
}
if (this->bufferSize < 9 + topicLength) {
// Too long
return false;
}
if (connected()) {
// Leave room in the buffer for header and variable length field
uint16_t length = MQTT_MAX_HEADER_SIZE;
nextMsgId++;
if (nextMsgId == 0) {
nextMsgId = 1;
}
this->buffer[length++] = (nextMsgId >> 8);
this->buffer[length++] = (nextMsgId & 0xFF);
length = writeString((char*)topic, this->buffer,length);
this->buffer[length++] = qos;
return write(MQTTSUBSCRIBE|MQTTQOS1,this->buffer,length-MQTT_MAX_HEADER_SIZE);
}
return false;
}
boolean PubSubClient::unsubscribe(const char* topic) {
size_t topicLength = strnlen(topic, this->bufferSize);
if (topic == 0) {
return false;
}
if (this->bufferSize < 9 + topicLength) {
// Too long
return false;
}
if (connected()) {
uint16_t length = MQTT_MAX_HEADER_SIZE;
nextMsgId++;
if (nextMsgId == 0) {
nextMsgId = 1;
}
this->buffer[length++] = (nextMsgId >> 8);
this->buffer[length++] = (nextMsgId & 0xFF);
length = writeString(topic, this->buffer,length);
return write(MQTTUNSUBSCRIBE|MQTTQOS1,this->buffer,length-MQTT_MAX_HEADER_SIZE);
}
return false;
}
void PubSubClient::disconnect() {
this->buffer[0] = MQTTDISCONNECT;
this->buffer[1] = 0;
_client->write(this->buffer,2);
_state = MQTT_DISCONNECTED;
_client->flush();
_client->stop();
lastInActivity = lastOutActivity = millis();
}
uint16_t PubSubClient::writeString(const char* string, uint8_t* buf, uint16_t pos) {
const char* idp = string;
uint16_t i = 0;
pos += 2;
while (*idp) {
buf[pos++] = *idp++;
i++;
}
buf[pos-i-2] = (i >> 8);
buf[pos-i-1] = (i & 0xFF);
return pos;
}
boolean PubSubClient::connected() {
boolean rc;
if (_client == NULL ) {
rc = false;
} else {
rc = (int)_client->connected();
if (!rc) {
if (this->_state == MQTT_CONNECTED) {
this->_state = MQTT_CONNECTION_LOST;
_client->flush();
_client->stop();
}
} else {
return this->_state == MQTT_CONNECTED;
}
}
return rc;
}
PubSubClient& PubSubClient::setServer(uint8_t * ip, uint16_t port) {
IPAddress addr(ip[0],ip[1],ip[2],ip[3]);
return setServer(addr,port);
}
PubSubClient& PubSubClient::setServer(IPAddress ip, uint16_t port) {
this->ip = ip;
this->port = port;
this->domain = NULL;
return *this;
}
PubSubClient& PubSubClient::setServer(const char * domain, uint16_t port) {
this->domain = domain;
this->port = port;
return *this;
}
PubSubClient& PubSubClient::setCallback(MQTT_CALLBACK_SIGNATURE) {
this->callback = callback;
return *this;
}
PubSubClient& PubSubClient::setClient(Client& client){
this->_client = &client;
return *this;
}
PubSubClient& PubSubClient::setStream(Stream& stream){
this->stream = &stream;
return *this;
}
int PubSubClient::state() {
return this->_state;
}
boolean PubSubClient::setBufferSize(uint16_t size) {
if (size == 0) {
// Cannot set it back to 0
return false;
}
if (this->bufferSize == 0) {
this->buffer = (uint8_t*)malloc(size);
} else {
uint8_t* newBuffer = (uint8_t*)realloc(this->buffer, size);
if (newBuffer != NULL) {
this->buffer = newBuffer;
} else {
return false;
}
}
this->bufferSize = size;
return (this->buffer != NULL);
}
uint16_t PubSubClient::getBufferSize() {
return this->bufferSize;
}
PubSubClient& PubSubClient::setKeepAlive(uint16_t keepAlive) {
this->keepAlive = keepAlive;
return *this;
}
PubSubClient& PubSubClient::setSocketTimeout(uint16_t timeout) {
this->socketTimeout = timeout;
return *this;
}

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/*
PubSubClient.h - A simple client for MQTT.
Nick O'Leary
http://knolleary.net
*/
#ifndef PubSubClient_h
#define PubSubClient_h
#include <Arduino.h>
#include "IPAddress.h"
#include "Client.h"
#include "Stream.h"
#define MQTT_VERSION_3_1 3
#define MQTT_VERSION_3_1_1 4
// MQTT_VERSION : Pick the version
//#define MQTT_VERSION MQTT_VERSION_3_1
#ifndef MQTT_VERSION
#define MQTT_VERSION MQTT_VERSION_3_1_1
#endif
// MQTT_MAX_PACKET_SIZE : Maximum packet size. Override with setBufferSize().
#ifndef MQTT_MAX_PACKET_SIZE
#define MQTT_MAX_PACKET_SIZE 256
#endif
// MQTT_KEEPALIVE : keepAlive interval in Seconds. Override with setKeepAlive()
#ifndef MQTT_KEEPALIVE
#define MQTT_KEEPALIVE 15
#endif
// MQTT_SOCKET_TIMEOUT: socket timeout interval in Seconds. Override with setSocketTimeout()
#ifndef MQTT_SOCKET_TIMEOUT
#define MQTT_SOCKET_TIMEOUT 15
#endif
// MQTT_MAX_TRANSFER_SIZE : limit how much data is passed to the network client
// in each write call. Needed for the Arduino Wifi Shield. Leave undefined to
// pass the entire MQTT packet in each write call.
//#define MQTT_MAX_TRANSFER_SIZE 80
// Possible values for client.state()
#define MQTT_CONNECTION_TIMEOUT -4
#define MQTT_CONNECTION_LOST -3
#define MQTT_CONNECT_FAILED -2
#define MQTT_DISCONNECTED -1
#define MQTT_CONNECTED 0
#define MQTT_CONNECT_BAD_PROTOCOL 1
#define MQTT_CONNECT_BAD_CLIENT_ID 2
#define MQTT_CONNECT_UNAVAILABLE 3
#define MQTT_CONNECT_BAD_CREDENTIALS 4
#define MQTT_CONNECT_UNAUTHORIZED 5
#define MQTTCONNECT 1 << 4 // Client request to connect to Server
#define MQTTCONNACK 2 << 4 // Connect Acknowledgment
#define MQTTPUBLISH 3 << 4 // Publish message
#define MQTTPUBACK 4 << 4 // Publish Acknowledgment
#define MQTTPUBREC 5 << 4 // Publish Received (assured delivery part 1)
#define MQTTPUBREL 6 << 4 // Publish Release (assured delivery part 2)
#define MQTTPUBCOMP 7 << 4 // Publish Complete (assured delivery part 3)
#define MQTTSUBSCRIBE 8 << 4 // Client Subscribe request
#define MQTTSUBACK 9 << 4 // Subscribe Acknowledgment
#define MQTTUNSUBSCRIBE 10 << 4 // Client Unsubscribe request
#define MQTTUNSUBACK 11 << 4 // Unsubscribe Acknowledgment
#define MQTTPINGREQ 12 << 4 // PING Request
#define MQTTPINGRESP 13 << 4 // PING Response
#define MQTTDISCONNECT 14 << 4 // Client is Disconnecting
#define MQTTReserved 15 << 4 // Reserved
#define MQTTQOS0 (0 << 1)
#define MQTTQOS1 (1 << 1)
#define MQTTQOS2 (2 << 1)
// Maximum size of fixed header and variable length size header
#define MQTT_MAX_HEADER_SIZE 5
#if defined(ESP8266) || defined(ESP32)
#include <functional>
#define MQTT_CALLBACK_SIGNATURE std::function<void(char*, uint8_t*, unsigned int)> callback
#else
#define MQTT_CALLBACK_SIGNATURE void (*callback)(char*, uint8_t*, unsigned int)
#endif
#define CHECK_STRING_LENGTH(l,s) if (l+2+strnlen(s, this->bufferSize) > this->bufferSize) {_client->stop();return false;}
class PubSubClient : public Print {
private:
Client* _client;
uint8_t* buffer;
uint16_t bufferSize;
uint16_t keepAlive;
uint16_t socketTimeout;
uint16_t nextMsgId;
unsigned long lastOutActivity;
unsigned long lastInActivity;
bool pingOutstanding;
MQTT_CALLBACK_SIGNATURE;
uint32_t readPacket(uint8_t*);
boolean readByte(uint8_t * result);
boolean readByte(uint8_t * result, uint16_t * index);
boolean write(uint8_t header, uint8_t* buf, uint16_t length);
uint16_t writeString(const char* string, uint8_t* buf, uint16_t pos);
// Build up the header ready to send
// Returns the size of the header
// Note: the header is built at the end of the first MQTT_MAX_HEADER_SIZE bytes, so will start
// (MQTT_MAX_HEADER_SIZE - <returned size>) bytes into the buffer
size_t buildHeader(uint8_t header, uint8_t* buf, uint16_t length);
IPAddress ip;
const char* domain;
uint16_t port;
Stream* stream;
int _state;
public:
PubSubClient();
PubSubClient(Client& client);
PubSubClient(IPAddress, uint16_t, Client& client);
PubSubClient(IPAddress, uint16_t, Client& client, Stream&);
PubSubClient(IPAddress, uint16_t, MQTT_CALLBACK_SIGNATURE,Client& client);
PubSubClient(IPAddress, uint16_t, MQTT_CALLBACK_SIGNATURE,Client& client, Stream&);
PubSubClient(uint8_t *, uint16_t, Client& client);
PubSubClient(uint8_t *, uint16_t, Client& client, Stream&);
PubSubClient(uint8_t *, uint16_t, MQTT_CALLBACK_SIGNATURE,Client& client);
PubSubClient(uint8_t *, uint16_t, MQTT_CALLBACK_SIGNATURE,Client& client, Stream&);
PubSubClient(const char*, uint16_t, Client& client);
PubSubClient(const char*, uint16_t, Client& client, Stream&);
PubSubClient(const char*, uint16_t, MQTT_CALLBACK_SIGNATURE,Client& client);
PubSubClient(const char*, uint16_t, MQTT_CALLBACK_SIGNATURE,Client& client, Stream&);
~PubSubClient();
PubSubClient& setServer(IPAddress ip, uint16_t port);
PubSubClient& setServer(uint8_t * ip, uint16_t port);
PubSubClient& setServer(const char * domain, uint16_t port);
PubSubClient& setCallback(MQTT_CALLBACK_SIGNATURE);
PubSubClient& setClient(Client& client);
PubSubClient& setStream(Stream& stream);
PubSubClient& setKeepAlive(uint16_t keepAlive);
PubSubClient& setSocketTimeout(uint16_t timeout);
boolean setBufferSize(uint16_t size);
uint16_t getBufferSize();
boolean connect(const char* id);
boolean connect(const char* id, const char* user, const char* pass);
boolean connect(const char* id, const char* willTopic, uint8_t willQos, boolean willRetain, const char* willMessage);
boolean connect(const char* id, const char* user, const char* pass, const char* willTopic, uint8_t willQos, boolean willRetain, const char* willMessage);
boolean connect(const char* id, const char* user, const char* pass, const char* willTopic, uint8_t willQos, boolean willRetain, const char* willMessage, boolean cleanSession);
void disconnect();
boolean publish(const char* topic, const char* payload);
boolean publish(const char* topic, const char* payload, boolean retained);
boolean publish(const char* topic, const uint8_t * payload, unsigned int plength);
boolean publish(const char* topic, const uint8_t * payload, unsigned int plength, boolean retained);
boolean publish_P(const char* topic, const char* payload, boolean retained);
boolean publish_P(const char* topic, const uint8_t * payload, unsigned int plength, boolean retained);
// Start to publish a message.
// This API:
// beginPublish(...)
// one or more calls to write(...)
// endPublish()
// Allows for arbitrarily large payloads to be sent without them having to be copied into
// a new buffer and held in memory at one time
// Returns 1 if the message was started successfully, 0 if there was an error
boolean beginPublish(const char* topic, unsigned int plength, boolean retained);
// Finish off this publish message (started with beginPublish)
// Returns 1 if the packet was sent successfully, 0 if there was an error
int endPublish();
// Write a single byte of payload (only to be used with beginPublish/endPublish)
virtual size_t write(uint8_t);
// Write size bytes from buffer into the payload (only to be used with beginPublish/endPublish)
// Returns the number of bytes written
virtual size_t write(const uint8_t *buffer, size_t size);
boolean subscribe(const char* topic);
boolean subscribe(const char* topic, uint8_t qos);
boolean unsubscribe(const char* topic);
boolean loop();
boolean connected();
int state();
};
#endif

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SparkFun License Information
============================
SparkFun uses two different licenses for our files — one for hardware and one for code.
Hardware
---------
**SparkFun hardware is released under [Creative Commons Share-alike 4.0 International](http://creativecommons.org/licenses/by-sa/4.0/).**
Note: This is a human-readable summary of (and not a substitute for) the [license](http://creativecommons.org/licenses/by-sa/4.0/legalcode).
You are free to:
Share — copy and redistribute the material in any medium or format
Adapt — remix, transform, and build upon the material
for any purpose, even commercially.
The licensor cannot revoke these freedoms as long as you follow the license terms.
Under the following terms:
Attribution — You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
ShareAlike — If you remix, transform, or build upon the material, you must distribute your contributions under the same license as the original.
No additional restrictions — You may not apply legal terms or technological measures that legally restrict others from doing anything the license permits.
Notices:
You do not have to comply with the license for elements of the material in the public domain or where your use is permitted by an applicable exception or limitation.
No warranties are given. The license may not give you all of the permissions necessary for your intended use. For example, other rights such as publicity, privacy, or moral rights may limit how you use the material.
Code
--------
**SparkFun code, firmware, and software is released under the MIT License(http://opensource.org/licenses/MIT).**
The MIT License (MIT)
Copyright (c) 2016 SparkFun Electronics
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

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SparkFun SCD30 CO₂ Sensor Library
===========================================================
![SparkFun SCD30 CO₂ Sensor](https://cdn.sparkfun.com//assets/parts/1/2/9/8/4/SparkFun_Sensirion_SCD30.jpg)
[*SparkX CO₂ Humidity and Temperature Sensor - SCD30 (SPX-14751)*](https://www.sparkfun.com/products/14751)
The SCD30 from Sensirion is a high quality [NDIR](https://en.wikipedia.org/wiki/Nondispersive_infrared_sensor) based CO₂ sensor capable of detecting 400 to 10000ppm with an accuracy of ±(30ppm+3%). In order to improve accuracy the SCD30 has temperature and humidity sensing built-in, as well as commands to compensate for altitude.
We've written an Arduino library to make reading the CO₂, humidity, and temperature very easy. It can be downloaded through the Arduino Library manager: search for 'SparkFun SCD30'. We recommend using a [Qwiic Breadboard Cable](https://www.sparkfun.com/products/14425) to connect the SCD30 to a Qwiic compatible board. The Ye*LL*ow wire goes in the SC*L* pin. The SCD30 also supports a serial interface but we haven't worked with it.
The CO₂ sensor works very well and for additional accuracy the SCD30 accepts ambient pressure readings. We recommend using the SCD30 in conjunction with the [Qwiic Pressure Sensor - MS5637](https://www.sparkfun.com/products/14688) or the [Qwiic Environmental Sensor - BME680](https://www.sparkfun.com/products/14570) to obtain the current barometric pressure.
Note: The SCD30 has an automatic self-calibration routine. Sensirion recommends 7 days of continuous readings with at least 1 hour a day of 'fresh air' for self-calibration to complete.
Library written by Nathan Seidle ([SparkFun](http://www.sparkfun.com)).
Thanks to!
* [jobr97](https://github.com/jobr97) for adding the getTemperatureOffset() method
* [bobobo1618](https://github.com/bobobo1618) for writing a CRC check and improving the return values of the library
* [labeneator](https://github.com/labeneator) for adding method to disable calibrate at begin
* [AndreasExner](https://github.com/AndreasExner) for adding [reset and getAutoSelfCalibration methods](https://github.com/sparkfun/SparkFun_SCD30_Arduino_Library/pull/17)
* [awatterott](https://github.com/awatterott) for adding [getAltitudeCompensation()](https://github.com/sparkfun/SparkFun_SCD30_Arduino_Library/pull/18)
* [jogi-k](https://github.com/jogi-k) for adding [teensy i2clib](https://github.com/sparkfun/SparkFun_SCD30_Arduino_Library/pull/19) support
* [paulvha](https://github.com/paulvha) for the suggestions and corrections in [his version of the library](https://github.com/paulvha/scd30)
Repository Contents
-------------------
* **/examples** - Example sketches for the library (.ino). Run these from the Arduino IDE.
* **/src** - Source files for the library (.cpp, .h).
* **keywords.txt** - Keywords from this library that will be highlighted in the Arduino IDE.
* **library.properties** - General library properties for the Arduino package manager.
Documentation
--------------
* **[Installing an Arduino Library Guide](https://learn.sparkfun.com/tutorials/installing-an-arduino-library)** - Basic information on how to install an Arduino library.
License Information
-------------------
This product is _**open source**_!
Various bits of the code have different licenses applied. Anything SparkFun wrote is beerware; if you see me (or any other SparkFun employee) at the local, and you've found our code helpful, please buy us a round!
Please use, reuse, and modify these files as you see fit. Please maintain attribution to SparkFun Electronics and release anything derivative under the same license.
Distributed as-is; no warranty is given.
- Your friends at SparkFun.

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#######################################
# Syntax Coloring Map
#######################################
#######################################
# Datatypes (KEYWORD1)
#######################################
SCD30 KEYWORD1
#######################################
# Methods and Functions (KEYWORD2)
#######################################
SCD30 KEYWORD2
begin KEYWORD2
enableDebugging KEYWORD2
beginMeasuring KEYWORD2
StopMeasurement KEYWORD2
getSettingValue KEYWORD2
getForcedRecalibration KEYWORD2
getMeasurementInterval KEYWORD2
getTemperatureOffset KEYWORD2
getAltitudeCompensation KEYWORD2
getFirmwareVersion KEYWORD2
getCO2 KEYWORD2
getHumidity KEYWORD2
getTemperature KEYWORD2
setMeasurementInterval KEYWORD2
setAmbientPressure KEYWORD2
setAltitudeCompensation KEYWORD2
setAutoSelfCalibration KEYWORD2
setForcedRecalibrationFactor KEYWORD2
setTemperatureOffset KEYWORD2
getAutoSelfCalibration KEYWORD2
dataAvailable KEYWORD2
readMeasurement KEYWORD2
reset KEYWORD2
sendCommand KEYWORD2
readRegister KEYWORD2
computeCRC8 KEYWORD2
#######################################
# Constants (LITERAL1)
#######################################
SCD30_ADDRESS LITERAL1
COMMAND_CONTINUOUS_MEASUREMENT LITERAL1
COMMAND_SET_MEASUREMENT_INTERVAL LITERAL1
COMMAND_GET_DATA_READY LITERAL1
COMMAND_READ_MEASUREMENT LITERAL1
COMMAND_AUTOMATIC_SELF_CALIBRATION LITERAL1
COMMAND_SET_FORCED_RECALIBRATION_FACTOR LITERAL1
COMMAND_SET_TEMPERATURE_OFFSET LITERAL1
COMMAND_SET_ALTITUDE_COMPENSATION LITERAL1
COMMAND_RESET LITERAL1
COMMAND_STOP_MEAS LITERAL1
COMMAND_READ_FW_VER LITERAL1

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name=SparkFun SCD30 Arduino Library
version=1.0.11
author=SparkFun Electronics
maintainer=SparkFun Electronics <sparkfun.com>
sentence=Library for the Sensirion SCD30 CO2 Sensor
paragraph=An Arduinolibrary for the SCD30 CO2 sensor from Sensirion. The SCD30 is a high quality <a href="https://en.wikipedia.org/wiki/Nondispersive_infrared_sensor">NDIR</a> based CO₂ sensor capable of detecting 400 to 10000ppm with an accuracy of ±(30ppm+3%). In order to improve accuracy the SCD30 has temperature and humidity sensing built-in, as well as commands to set the current altitude.<br><br>Get the SCD30 <a href="https://www.sparkfun.com/products/14751">here</a>.
category=Sensors
url=https://github.com/sparkfun/SparkFun_SCD30_Arduino_Library
architectures=*

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/*
This is a library written for the SCD30
SparkFun sells these at its website: www.sparkfun.com
Do you like this library? Help support SparkFun. Buy a board!
https://www.sparkfun.com/products/14751
Written by Nathan Seidle @ SparkFun Electronics, May 22nd, 2018
Updated February 1st 2021 to include some of the features of paulvha's version of the library
(while maintaining backward-compatibility):
https://github.com/paulvha/scd30
Thank you Paul!
The SCD30 measures CO2 with accuracy of +/- 30ppm.
This library handles the initialization of the SCD30 and outputs
CO2 levels, relative humidty, and temperature.
https://github.com/sparkfun/SparkFun_SCD30_Arduino_Library
Development environment specifics:
Arduino IDE 1.8.13
SparkFun code, firmware, and software is released under the MIT License.
Please see LICENSE.md for more details.
*/
#include "SparkFun_SCD30_Arduino_Library.h"
SCD30::SCD30(void)
{
// Constructor
}
//Initialize the Serial port
#ifdef USE_TEENSY3_I2C_LIB
bool SCD30::begin(i2c_t3 &wirePort, bool autoCalibrate, bool measBegin)
#else
bool SCD30::begin(TwoWire &wirePort, bool autoCalibrate, bool measBegin)
#endif
{
_i2cPort = &wirePort; //Grab which port the user wants us to use
/* Especially during obtaining the ACK BIT after a byte sent the SCD30 is using clock stretching (but NOT only there)!
* The need for clock stretching is described in the Sensirion_CO2_Sensors_SCD30_Interface_Description.pdf
*
* The default clock stretch (maximum wait time) on the ESP8266-library (2.4.2) is 230us which is set during _i2cPort->begin();
* In the current implementation of the ESP8266 I2C driver there is NO error message when this time expired, while
* the clock stretch is still happening, causing uncontrolled behaviour of the hardware combination.
*
* To set ClockStretchlimit() a check for ESP8266 boards has been added in the driver.
*
* With setting to 20000, we set a max timeout of 20mS (> 20x the maximum measured) basically disabling the time-out
* and now wait for clock stretch to be controlled by the client.
*/
#if defined(ARDUINO_ARCH_ESP8266)
_i2cPort->setClockStretchLimit(200000);
#endif
uint16_t fwVer;
if (getFirmwareVersion(&fwVer) == false) // Read the firmware version. Return false if the CRC check fails.
return (false);
if (_printDebug == true)
{
_debugPort->print(F("SCD30 begin: got firmware version 0x"));
_debugPort->println(fwVer, HEX);
}
if (measBegin == false) // Exit now if measBegin is false
return (true);
//Check for device to respond correctly
if (beginMeasuring() == true) //Start continuous measurements
{
setMeasurementInterval(2); //2 seconds between measurements
setAutoSelfCalibration(autoCalibrate); //Enable auto-self-calibration
return (true);
}
return (false); //Something went wrong
}
//Calling this function with nothing sets the debug port to Serial
//You can also call it with other streams like Serial1, SerialUSB, etc.
void SCD30::enableDebugging(Stream &debugPort)
{
_debugPort = &debugPort;
_printDebug = true;
}
//Returns the latest available CO2 level
//If the current level has already been reported, trigger a new read
uint16_t SCD30::getCO2(void)
{
if (co2HasBeenReported == true) //Trigger a new read
readMeasurement(); //Pull in new co2, humidity, and temp into global vars
co2HasBeenReported = true;
return (uint16_t)co2; //Cut off decimal as co2 is 0 to 10,000
}
//Returns the latest available humidity
//If the current level has already been reported, trigger a new read
float SCD30::getHumidity(void)
{
if (humidityHasBeenReported == true) //Trigger a new read
readMeasurement(); //Pull in new co2, humidity, and temp into global vars
humidityHasBeenReported = true;
return humidity;
}
//Returns the latest available temperature
//If the current level has already been reported, trigger a new read
float SCD30::getTemperature(void)
{
if (temperatureHasBeenReported == true) //Trigger a new read
readMeasurement(); //Pull in new co2, humidity, and temp into global vars
temperatureHasBeenReported = true;
return temperature;
}
//Enables or disables the ASC
bool SCD30::setAutoSelfCalibration(bool enable)
{
if (enable)
return sendCommand(COMMAND_AUTOMATIC_SELF_CALIBRATION, 1); //Activate continuous ASC
else
return sendCommand(COMMAND_AUTOMATIC_SELF_CALIBRATION, 0); //Deactivate continuous ASC
}
//Set the forced recalibration factor. See 1.3.7.
//The reference CO2 concentration has to be within the range 400 ppm ≤ cref(CO2) ≤ 2000 ppm.
bool SCD30::setForcedRecalibrationFactor(uint16_t concentration)
{
if (concentration < 400 || concentration > 2000)
{
return false; //Error check.
}
return sendCommand(COMMAND_SET_FORCED_RECALIBRATION_FACTOR, concentration);
}
//Get the temperature offset. See 1.3.8.
float SCD30::getTemperatureOffset(void)
{
uint16_t response = readRegister(COMMAND_SET_TEMPERATURE_OFFSET);
return (((float)response) / 100.0);
}
//Set the temperature offset. See 1.3.8.
bool SCD30::setTemperatureOffset(float tempOffset)
{
union
{
int16_t signed16;
uint16_t unsigned16;
} signedUnsigned; // Avoid any ambiguity casting int16_t to uint16_t
signedUnsigned.signed16 = tempOffset * 100;
return sendCommand(COMMAND_SET_TEMPERATURE_OFFSET, signedUnsigned.unsigned16);
}
//Get the altitude compenstation. See 1.3.9.
uint16_t SCD30::getAltitudeCompensation(void)
{
return readRegister(COMMAND_SET_ALTITUDE_COMPENSATION);
}
//Set the altitude compenstation. See 1.3.9.
bool SCD30::setAltitudeCompensation(uint16_t altitude)
{
return sendCommand(COMMAND_SET_ALTITUDE_COMPENSATION, altitude);
}
//Set the pressure compenstation. This is passed during measurement startup.
//mbar can be 700 to 1200
bool SCD30::setAmbientPressure(uint16_t pressure_mbar)
{
if (pressure_mbar < 700 || pressure_mbar > 1200)
{
return false;
}
return sendCommand(COMMAND_CONTINUOUS_MEASUREMENT, pressure_mbar);
}
// SCD30 soft reset
void SCD30::reset()
{
sendCommand(COMMAND_RESET);
}
// Get the current ASC setting
bool SCD30::getAutoSelfCalibration()
{
uint16_t response = readRegister(COMMAND_AUTOMATIC_SELF_CALIBRATION);
if (response == 1) {
return true;
}
else {
return false;
}
}
//Begins continuous measurements
//Continuous measurement status is saved in non-volatile memory. When the sensor
//is powered down while continuous measurement mode is active SCD30 will measure
//continuously after repowering without sending the measurement command.
//Returns true if successful
bool SCD30::beginMeasuring(uint16_t pressureOffset)
{
return (sendCommand(COMMAND_CONTINUOUS_MEASUREMENT, pressureOffset));
}
//Overload - no pressureOffset
bool SCD30::beginMeasuring(void)
{
return (beginMeasuring(0));
}
// Stop continuous measurement
bool SCD30::StopMeasurement(void)
{
return(sendCommand(COMMAND_STOP_MEAS));
}
//Sets interval between measurements
//2 seconds to 1800 seconds (30 minutes)
bool SCD30::setMeasurementInterval(uint16_t interval)
{
return sendCommand(COMMAND_SET_MEASUREMENT_INTERVAL, interval);
}
//Returns true when data is available
bool SCD30::dataAvailable()
{
uint16_t response = readRegister(COMMAND_GET_DATA_READY);
if (response == 1)
return (true);
return (false);
}
//Get 18 bytes from SCD30
//Updates global variables with floats
//Returns true if success
bool SCD30::readMeasurement()
{
//Verify we have data from the sensor
if (dataAvailable() == false)
return (false);
ByteToFl tempCO2; tempCO2.value = 0;
ByteToFl tempHumidity; tempHumidity.value = 0;
ByteToFl tempTemperature; tempTemperature.value = 0;
_i2cPort->beginTransmission(SCD30_ADDRESS);
_i2cPort->write(COMMAND_READ_MEASUREMENT >> 8); //MSB
_i2cPort->write(COMMAND_READ_MEASUREMENT & 0xFF); //LSB
if (_i2cPort->endTransmission() != 0)
return (0); //Sensor did not ACK
const uint8_t receivedBytes = _i2cPort->requestFrom((uint8_t)SCD30_ADDRESS, (uint8_t)18);
bool error = false;
if (_i2cPort->available())
{
byte bytesToCrc[2];
for (byte x = 0; x < 18; x++)
{
byte incoming = _i2cPort->read();
switch (x)
{
case 0:
case 1:
case 3:
case 4:
tempCO2.array[x < 3 ? 3-x : 4-x] = incoming;
bytesToCrc[x % 3] = incoming;
break;
case 6:
case 7:
case 9:
case 10:
tempTemperature.array[x < 9 ? 9-x : 10-x] = incoming;
bytesToCrc[x % 3] = incoming;
break;
case 12:
case 13:
case 15:
case 16:
tempHumidity.array[x < 15 ? 15-x : 16-x] = incoming;
bytesToCrc[x % 3] = incoming;
break;
default:
//Validate CRC
uint8_t foundCrc = computeCRC8(bytesToCrc, 2);
if (foundCrc != incoming)
{
if (_printDebug == true)
{
_debugPort->print(F("readMeasurement: found CRC in byte "));
_debugPort->print(x);
_debugPort->print(F(", expected 0x"));
_debugPort->print(foundCrc, HEX);
_debugPort->print(F(", got 0x"));
_debugPort->println(incoming, HEX);
}
error = true;
}
break;
}
}
}
else
{
if (_printDebug == true)
{
_debugPort->print(F("readMeasurement: no SCD30 data found from I2C, i2c claims we should receive "));
_debugPort->print(receivedBytes);
_debugPort->println(F(" bytes"));
}
return false;
}
if (error)
{
if (_printDebug == true)
_debugPort->println(F("readMeasurement: encountered error reading SCD30 data."));
return false;
}
//Now copy the uint32s into their associated floats
co2 = tempCO2.value;
temperature = tempTemperature.value;
humidity = tempHumidity.value;
//Mark our global variables as fresh
co2HasBeenReported = false;
humidityHasBeenReported = false;
temperatureHasBeenReported = false;
return (true); //Success! New data available in globals.
}
//Gets a setting by reading the appropriate register.
//Returns true if the CRC is valid.
bool SCD30::getSettingValue(uint16_t registerAddress, uint16_t *val)
{
_i2cPort->beginTransmission(SCD30_ADDRESS);
_i2cPort->write(registerAddress >> 8); //MSB
_i2cPort->write(registerAddress & 0xFF); //LSB
if (_i2cPort->endTransmission() != 0)
return (false); //Sensor did not ACK
_i2cPort->requestFrom((uint8_t)SCD30_ADDRESS, (uint8_t)3); // Request data and CRC
if (_i2cPort->available())
{
uint8_t data[2];
data[0] = _i2cPort->read();
data[1] = _i2cPort->read();
uint8_t crc = _i2cPort->read();
*val = (uint16_t)data[0] << 8 | data[1];
uint8_t expectedCRC = computeCRC8(data, 2);
if (crc == expectedCRC) // Return true if CRC check is OK
return (true);
if (_printDebug == true)
{
_debugPort->print(F("getSettingValue: CRC fail: expected 0x"));
_debugPort->print(expectedCRC, HEX);
_debugPort->print(F(", got 0x"));
_debugPort->println(crc, HEX);
}
}
return (false);
}
//Gets two bytes from SCD30
uint16_t SCD30::readRegister(uint16_t registerAddress)
{
_i2cPort->beginTransmission(SCD30_ADDRESS);
_i2cPort->write(registerAddress >> 8); //MSB
_i2cPort->write(registerAddress & 0xFF); //LSB
if (_i2cPort->endTransmission() != 0)
return (0); //Sensor did not ACK
_i2cPort->requestFrom((uint8_t)SCD30_ADDRESS, (uint8_t)2);
if (_i2cPort->available())
{
uint8_t msb = _i2cPort->read();
uint8_t lsb = _i2cPort->read();
return ((uint16_t)msb << 8 | lsb);
}
return (0); //Sensor did not respond
}
//Sends a command along with arguments and CRC
bool SCD30::sendCommand(uint16_t command, uint16_t arguments)
{
uint8_t data[2];
data[0] = arguments >> 8;
data[1] = arguments & 0xFF;
uint8_t crc = computeCRC8(data, 2); //Calc CRC on the arguments only, not the command
_i2cPort->beginTransmission(SCD30_ADDRESS);
_i2cPort->write(command >> 8); //MSB
_i2cPort->write(command & 0xFF); //LSB
_i2cPort->write(arguments >> 8); //MSB
_i2cPort->write(arguments & 0xFF); //LSB
_i2cPort->write(crc);
if (_i2cPort->endTransmission() != 0)
return (false); //Sensor did not ACK
return (true);
}
//Sends just a command, no arguments, no CRC
bool SCD30::sendCommand(uint16_t command)
{
_i2cPort->beginTransmission(SCD30_ADDRESS);
_i2cPort->write(command >> 8); //MSB
_i2cPort->write(command & 0xFF); //LSB
if (_i2cPort->endTransmission() != 0)
return (false); //Sensor did not ACK
return (true);
}
//Given an array and a number of bytes, this calculate CRC8 for those bytes
//CRC is only calc'd on the data portion (two bytes) of the four bytes being sent
//From: http://www.sunshine2k.de/articles/coding/crc/understanding_crc.html
//Tested with: http://www.sunshine2k.de/coding/javascript/crc/crc_js.html
//x^8+x^5+x^4+1 = 0x31
uint8_t SCD30::computeCRC8(uint8_t data[], uint8_t len)
{
uint8_t crc = 0xFF; //Init with 0xFF
for (uint8_t x = 0; x < len; x++)
{
crc ^= data[x]; // XOR-in the next input byte
for (uint8_t i = 0; i < 8; i++)
{
if ((crc & 0x80) != 0)
crc = (uint8_t)((crc << 1) ^ 0x31);
else
crc <<= 1;
}
}
return crc; //No output reflection
}

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/*
This is a library written for the SCD30
SparkFun sells these at its website: www.sparkfun.com
Do you like this library? Help support SparkFun. Buy a board!
https://www.sparkfun.com/products/14751
Written by Nathan Seidle @ SparkFun Electronics, May 22nd, 2018
Updated February 1st 2021 to include some of the features of paulvha's version of the library
(while maintaining backward-compatibility):
https://github.com/paulvha/scd30
Thank you Paul!
The SCD30 measures CO2 with accuracy of +/- 30ppm.
This library handles the initialization of the SCD30 and outputs
CO2 levels, relative humidty, and temperature.
https://github.com/sparkfun/SparkFun_SCD30_Arduino_Library
Development environment specifics:
Arduino IDE 1.8.13
SparkFun code, firmware, and software is released under the MIT License.
Please see LICENSE.md for more details.
*/
#ifndef __SparkFun_SCD30_ARDUINO_LIBARARY_H__
#define __SparkFun_SCD30_ARDUINO_LIBARARY_H__
// Uncomment the next #define if using an Teensy >= 3 or Teensy LC and want to use the dedicated I2C-Library for it
// Then you also have to include <i2c_t3.h> on your application instead of <Wire.h>
// #define USE_TEENSY3_I2C_LIB
#include "Arduino.h"
#ifdef USE_TEENSY3_I2C_LIB
#include <i2c_t3.h>
#else
#include <Wire.h>
#endif
//The default I2C address for the SCD30 is 0x61.
#define SCD30_ADDRESS 0x61
//Available commands
#define COMMAND_CONTINUOUS_MEASUREMENT 0x0010
#define COMMAND_SET_MEASUREMENT_INTERVAL 0x4600
#define COMMAND_GET_DATA_READY 0x0202
#define COMMAND_READ_MEASUREMENT 0x0300
#define COMMAND_AUTOMATIC_SELF_CALIBRATION 0x5306
#define COMMAND_SET_FORCED_RECALIBRATION_FACTOR 0x5204
#define COMMAND_SET_TEMPERATURE_OFFSET 0x5403
#define COMMAND_SET_ALTITUDE_COMPENSATION 0x5102
#define COMMAND_RESET 0xD304 // Soft reset
#define COMMAND_STOP_MEAS 0x0104
#define COMMAND_READ_FW_VER 0xD100
typedef union {
byte array[4];
float value;
} ByteToFl; // paulvha
class SCD30
{
public:
SCD30(void);
bool begin(bool autoCalibrate) { return begin(Wire, autoCalibrate); }
#ifdef USE_TEENSY3_I2C_LIB
bool begin(i2c_t3 &wirePort = Wire, bool autoCalibrate=true, bool measBegin=true); //By default use Wire port
#else
bool begin(TwoWire &wirePort = Wire, bool autoCalibrate=true, bool measBegin=true); //By default use Wire port
#endif
void enableDebugging(Stream &debugPort = Serial); //Turn on debug printing. If user doesn't specify then Serial will be used.
bool beginMeasuring(uint16_t pressureOffset);
bool beginMeasuring(void);
bool StopMeasurement(void); // paulvha
// based on paulvha
bool getSettingValue(uint16_t registerAddress, uint16_t *val);
bool getForcedRecalibration(uint16_t *val) {return(getSettingValue(COMMAND_SET_FORCED_RECALIBRATION_FACTOR, val));}
bool getMeasurementInterval(uint16_t *val) {return(getSettingValue(COMMAND_SET_MEASUREMENT_INTERVAL, val));}
bool getTemperatureOffset(uint16_t *val) {return(getSettingValue(COMMAND_SET_TEMPERATURE_OFFSET, val));}
bool getAltitudeCompensation(uint16_t *val) {return(getSettingValue(COMMAND_SET_ALTITUDE_COMPENSATION, val));}
bool getFirmwareVersion(uint16_t *val) {return(getSettingValue(COMMAND_READ_FW_VER, val));}
uint16_t getCO2(void);
float getHumidity(void);
float getTemperature(void);
float getTemperatureOffset(void);
uint16_t getAltitudeCompensation(void);
bool setMeasurementInterval(uint16_t interval);
bool setAmbientPressure(uint16_t pressure_mbar);
bool setAltitudeCompensation(uint16_t altitude);
bool setAutoSelfCalibration(bool enable);
bool setForcedRecalibrationFactor(uint16_t concentration);
bool setTemperatureOffset(float tempOffset);
bool getAutoSelfCalibration(void);
bool dataAvailable();
bool readMeasurement();
void reset();
bool sendCommand(uint16_t command, uint16_t arguments);
bool sendCommand(uint16_t command);
uint16_t readRegister(uint16_t registerAddress);
uint8_t computeCRC8(uint8_t data[], uint8_t len);
private:
//Variables
#ifdef USE_TEENSY3_I2C_LIB
i2c_t3 *_i2cPort; //The generic connection to user's chosen I2C hardware
#else
TwoWire *_i2cPort; //The generic connection to user's chosen I2C hardware
#endif
//Global main datums
float co2 = 0;
float temperature = 0;
float humidity = 0;
//These track the staleness of the current data
//This allows us to avoid calling readMeasurement() every time individual datums are requested
bool co2HasBeenReported = true;
bool humidityHasBeenReported = true;
bool temperatureHasBeenReported = true;
//Debug
Stream *_debugPort; //The stream to send debug messages to if enabled. Usually Serial.
boolean _printDebug = false; //Flag to print debugging variables
};
#endif

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#include "util.h"
namespace config {
const char *ntp_server = NTP_SERVER;
const long utc_offset_in_seconds = UTC_OFFSET_IN_SECONDS; // UTC+1
}
// Get last 3 bytes of ESP MAC (worldwide unique)
String macToID() {
uint8_t mac[6];
WiFi.macAddress(mac);
String result;
for (int i = 3; i < 6; i++) {
if (mac[i] < 16)
result += '0';
result += String(mac[i], HEX);
}
result.toLowerCase();
return result;
}
//NOTE: ESP32 sometimes couldn't access the NTP server, and every loop would take +1000ms
// ifdefs could be used to define functions specific to ESP32, e.g. with configTime
namespace ntp {
WiFiUDP ntpUDP;
NTPClient timeClient(ntpUDP, config::ntp_server, config::utc_offset_in_seconds, 60000UL);
void initialize() {
timeClient.begin();
}
void update() {
timeClient.update();
}
String getLocalTime() {
return timeClient.getFormattedDate();
}
}
uint32_t max_loop_duration = 0;
//FIXME: Remove every instance of Strings, to avoid heap fragmentation problems. (Start: "Free heap space : 17104 bytes")
// See more https://cpp4arduino.com/2020/02/07/how-to-format-strings-without-the-string-class.html
const String SENSOR_ID = "ESP" + macToID();

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#ifndef AMPEL_UTIL_H_INCLUDED
#define AMPEL_UTIL_H_INCLUDED
#include <Arduino.h>
#include "config.h"
#include <WiFiUdp.h> // required for NTP
#include "src/lib/NTPClient-master/NTPClient.h" // NTP
#if defined(ESP8266)
# define BOARD "ESP8266"
# include <ESP8266WiFi.h> // required to get MAC address
# define get_free_heap_size() system_get_free_heap_size()
#elif defined(ESP32)
# define BOARD "ESP32"
# include <WiFi.h> // required to get MAC address
# define get_free_heap_size() esp_get_free_heap_size()
#else
# define BOARD "Unknown"
#endif
namespace ntp {
void initialize();
void update();
String getLocalTime();
}
namespace util {
template<typename Tpa, typename Tpb>
inline auto min(const Tpa &a, const Tpb &b) -> decltype(a < b ? a : b) {
return b < a ? b : a;
}
template<typename Tpa, typename Tpb>
inline auto max(const Tpa &a, const Tpb &b) -> decltype(b > a ? b : a) {
return b > a ? b : a;
}
}
//NOTE: Only use seconds() for duration comparison, not timestamps comparison. Otherwise, problems happen when millis roll over.
#define seconds() (millis() / 1000UL)
extern uint32_t max_loop_duration;
const extern String SENSOR_ID;
#endif

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#include "web_server.h"
namespace config {
// Values should be defined in config.h
#ifdef HTTP_USER
const char *http_user = HTTP_USER;
#else
const char *http_user = "";
#endif
#ifdef HTTP_PASSWORD
const char *http_password = HTTP_PASSWORD;
#else
const char *http_password = "";
#endif
}
namespace web_server {
const char *header_template;
const char *body_template;
const char *script_template;
void handleWebServerRoot();
void handlePageNotFound();
#ifdef AMPEL_CSV
void handleDeleteCSV();
void handleWebServerCSV();
#endif
#if defined(ESP8266)
ESP8266WebServer http(80); // Create a webserver object that listens for HTTP request on port 80
#elif defined(ESP32)
WebServer http(80);
#endif
void update() {
http.handleClient(); // Listen for HTTP requests from clients
}
void initialize() {
header_template =
PSTR("<!doctype html><html lang=en>"
"<head>\n"
"<title>%d ppm - CO2 SENSOR - %s - %s</title>\n"
"<meta charset='UTF-8'>\n"
// HfT Favicon
"<link rel='icon' type='image/png' sizes='16x16' href='data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAYAAAAf8/9hAAAABHNCSVQICAgIfAhkiAAAAHtJREFUOE9jvMnA+5+BAsBIFQMkl85h+P3kGcOb8jqwW+TPH2H4de0GA29UGNxtfx49YWCRk0HwHz5iuKegwwB2AS4DkA2F6VR6cAWsEQbgBqDY9vARw/ejJ+Au+LxsFcPz6BSwHpwGYPMCSS6gyAAKYhESiKMGjPgwAADopHVhn5ynEwAAAABJRU5ErkJggg=='/>\n"
// Responsive grid:
"<link rel='stylesheet' href='https://unpkg.com/purecss@2.0.3/build/pure-min.css'>\n"
"<link rel='stylesheet' href='https://unpkg.com/purecss@2.0.3/build/grids-responsive-min.css'>\n"
// JS Graphs:
"<script src='https://cdn.plot.ly/plotly-basic-1.58.2.min.js'></script>\n"
// Fullscreen
"<meta name='viewport' content='width=device-width, initial-scale=1'>\n"
// Refresh after every measurement.
// "<meta http-equiv='refresh' content='%d'>\n"
"</head>\n"
"<body>\n"
"<div class='pure-g'><div class='pure-u-1'><div class='pure-menu'><p class='pure-menu-heading'>MakerLab Murnau e.V. CO<sub>2</sub> Ampel</p></div></div>\n"
"<div class='pure-u-1'><ul class='pure-menu pure-menu-horizontal pure-menu-list'>\n"
"<li class='pure-menu-item'><a href='#table' class='pure-menu-link'>Info</a></li>\n"
#ifdef AMPEL_CSV
"<li class='pure-menu-item'><a href='#graph' class='pure-menu-link'>Graph</a></li>\n"
"<li class='pure-menu-item'><a href='#log' class='pure-menu-link'>Log</a></li>\n"
"<li class='pure-menu-item'><a href='./%s' class='pure-menu-link'>Download CSV</a></li>\n"
#endif
"<li class='pure-menu-item' id='led'>&#11044;</li>\n" // LED
"</ul></div></div>\n"
"<script>\n"
// Show a colored dot on the webpage, with a similar color than on LED Ring.
"hue=(1-(Math.min(Math.max(parseInt(document.title),500),1600)-500)/1100)*120;\n"
"document.getElementById('led').style.color=['hsl(',hue,',100%%,50%%)'].join('');\n"
"</script>\n");
body_template =
PSTR("<div class='pure-g'>\n"
"<div class='pure-u-1' id='graph'></div>\n" // Graph placeholder
"</div>\n"
"<div class='pure-g'>\n"
//Sensor table
"<table id='table' class='pure-table-striped pure-u-1 pure-u-md-1-2'>\n"
"<tr><th colspan='2'>%s</th></tr>\n"
"<tr><td>CO<sub>2</sub> concentration</td><td>%5d ppm</td></tr>\n"
"<tr><td>Temperature</td><td>%.1f&#8451;</td></tr>\n"
"<tr><td>Humidity</td><td>%.1f%%</td></tr>\n"
"<tr><td>Last measurement</td><td>%s</td></tr>\n"
"<tr><td>Measurement timestep</td><td>%5d s</td></tr>\n"
#ifdef AMPEL_CSV
"<tr><th colspan='2'>CSV</th></tr>\n"
"<tr><td>Last write</td><td>%s</td></tr>\n"
"<tr><td>Timestep</td><td>%5d s</td></tr>\n"
"<tr><td>Available drive space</td><td>%d kB</td></tr>\n"
#endif
#ifdef AMPEL_MQTT
"<tr><th colspan='2'>MQTT</th></tr>\n"
"<tr><td>Connected?</td><td>%s</td></tr>\n"
"<tr><td>Last publish</td><td>%s</td></tr>\n"
"<tr><td>Timestep</td><td>%5d s</td></tr>\n"
#endif
#if defined(AMPEL_LORAWAN) && defined(ESP32)
"<tr><th colspan='2'>LoRaWAN</th></tr>\n"
"<tr><td>Connected?</td><td>%s</td></tr>\n"
"<tr><td>Frequency</td><td>%s MHz</td></tr>\n"
"<tr><td>Last transmission</td><td>%s</td></tr>\n"
"<tr><td>Timestep</td><td>%5d s</td></tr>\n"
#endif
"<tr><th colspan='2'>Sensor</th></tr>\n"
"<tr><td>Temperature offset</td><td>%.1fK</td></tr>\n" //TODO: Read it from sensor?
"<tr><td>Local address</td><td><a href='http://%s.local/'>%s.local</a></td></tr>\n"
"<tr><td>Local IP</td><td><a href='http://%s'>%s</a></td></tr>\n"
"<tr><td>Free heap space</td><td>%6d bytes</td></tr>\n"
"<tr><td>Max loop duration</td><td>%5d ms</td></tr>\n"
"<tr><td>Board</td><td>%s</td></tr>\n"
"<tr><td>Uptime</td><td>%2d d %4d h %02d min %02d s</td></tr>\n"
"</table>\n"
"<div id='log' class='pure-u-1 pure-u-md-1-2'></div>\n"
#ifdef AMPEL_CSV
"<form action='/delete_csv' method='POST' onsubmit=\"return confirm('Are you really sure you want to delete all data?') && (document.body.style.cursor = 'wait');\">"
"<input type='submit' value='Delete CSV'/>"
"</form>\n"
#endif
"</div>\n");
script_template =
PSTR(
"<a href='https://transfer.hft-stuttgart.de/gitlab/co2ampel/ampel-firmware' target='_blank'>Source code</a>\n"
"<a href='https://transfer.hft-stuttgart.de/gitlab/co2ampel/ampel-documentation' target='_blank'>Documentation</a>\n"
#ifdef AMPEL_CSV
"<script>\n"
"document.body.style.cursor = 'default';\n"
"fetch('./%s',{credentials:'include'})\n"
".then(response=>response.text())\n"
".then(csvText=>csvToTable(csvText))\n"
".then(htmlTable=>addLogTableToPage(htmlTable))\n"
".then(_=>Plotly.newPlot('graph',data,layout,{displaylogo:false}))\n"
".catch(e=>console.error(e));\n"
"xs=[];\n"
"data=[{x:xs,y:[],type:'scatter',name:'CO<sub>2</sub>',line:{color:'#2ca02c'}},\n"
"{x:xs,y:[],type:'scatter',name:'Temperature',yaxis:'y2',line:{color:'#ff7f0e',dash:'dot'}},\n"
"{x:xs,y:[],type:'scatter',name:'Humidity',yaxis:'y3',line:{color:'#1f77b4',dash:'dot'}}];\n"
"layout={height:600,title:'%s',legend:{xanchor:'right',x:0.2,y:1.0},\n"
"xaxis:{domain:[0.0,0.85]},yaxis:{ticksuffix:'ppm',range:[0,2000],dtick:200},\n"
"yaxis2:{overlaying:'y',side:'right',ticksuffix:'°C',position:0.9,anchor:'free',range:[0,30],dtick:3},\n"
"yaxis3:{overlaying:'y',side:'right',ticksuffix:'%%',position:0.95,anchor:'free',range:[0,100],dtick:10}\n"
"};\n"
"function csvToTable(csvText) {\n"
"csvText=csvText.trim();\n"
"lines=csvText.split('\\n');\n"
"table=document.createElement('table');\n"
"table.className='pure-table-striped';\n"
"n=lines.length;\n"
"lines.forEach((line,i)=>{\n"
"fields=line.split(';');\n"
"xs.push(fields[0]);\n"
"data[0]['y'].push(fields[1]);\n"
"data[1]['y'].push(fields[2]);\n"
"data[2]['y'].push(fields[3]);\n"
"if(i>4 && i<n-12){if(i==5){fields=['...','...','...','...']}else{return;}}\n"
"row=document.createElement('tr');\n"
"fields.forEach((field,index)=>{\n"
"cell=document.createElement(i<2?'th':'td');\n"
"cell.appendChild(document.createTextNode(field));\n"
"row.appendChild(cell);});\n"
"table.appendChild(row);});\n"
"return table;}\n"
"function addLogTableToPage(table){document.getElementById('log').appendChild(table);}\n"
"</script>\n"
#endif
"</body>\n"
"</html>");
// Web-server
http.on("/", handleWebServerRoot);
#ifdef AMPEL_CSV
http.on("/" + csv_writer::filename, handleWebServerCSV);
http.on("/delete_csv", HTTP_POST, handleDeleteCSV);
#endif
http.onNotFound(handlePageNotFound);
http.begin();
Serial.print(F("You can access this sensor via http://"));
Serial.print(SENSOR_ID);
Serial.print(F(".local (might be unstable) or http://"));
Serial.println(WiFi.localIP());
}
// Allow access if http_user or http_password are empty, or if provided credentials match
bool shouldBeAllowed() {
return strcmp(config::http_user, "") == 0 || strcmp(config::http_password, "") == 0
|| http.authenticate(config::http_user, config::http_password);
}
void handleWebServerRoot() {
if (!shouldBeAllowed()) {
return http.requestAuthentication(DIGEST_AUTH);
}
unsigned long ss = seconds();
uint8_t dd = ss / 86400;
ss -= dd * 86400;
unsigned int hh = ss / 3600;
ss -= hh * 3600;
uint8_t mm = ss / 60;
ss -= mm * 60;
//NOTE: Splitting in multiple parts in order to use less RAM
char content[2000]; // Update if needed
// Header size : 1611 - Body size : 1800 - Script size : 1920
// Header
snprintf_P(content, sizeof(content), header_template, sensor::co2, SENSOR_ID.c_str(),
WiFi.localIP().toString().c_str()
#ifdef AMPEL_CSV
, csv_writer::filename.c_str()
#endif
);
http.setContentLength(CONTENT_LENGTH_UNKNOWN);
http.send_P(200, PSTR("text/html"), content);
// Body
snprintf_P(content, sizeof(content), body_template, SENSOR_ID.c_str(), sensor::co2, sensor::temperature,
sensor::humidity, sensor::timestamp.c_str(), config::measurement_timestep,
#ifdef AMPEL_CSV
csv_writer::last_successful_write.c_str(), config::csv_interval, csv_writer::getAvailableSpace() / 1024,
#endif
#ifdef AMPEL_MQTT
mqtt::connected ? "Yes" : "No", mqtt::last_successful_publish.c_str(), config::sending_interval,
#endif
#if defined(AMPEL_LORAWAN) && defined(ESP32)
lorawan::connected ? "Yes" : "No", LMIC_FREQUENCY_PLAN, lorawan::last_transmission.c_str(),
config::lorawan_sending_interval,
#endif
config::temperature_offset, SENSOR_ID.c_str(), SENSOR_ID.c_str(), WiFi.localIP().toString().c_str(),
WiFi.localIP().toString().c_str(), get_free_heap_size(), max_loop_duration, BOARD, dd, hh, mm, ss);
http.sendContent(content);
// Script
snprintf_P(content, sizeof(content), script_template
#ifdef AMPEL_CSV
, csv_writer::filename.c_str(), SENSOR_ID.c_str()
#endif
);
http.sendContent(content);
}
#ifdef AMPEL_CSV
void handleWebServerCSV() {
if (!shouldBeAllowed()) {
return http.requestAuthentication(DIGEST_AUTH);
}
if (FS_LIB.exists(csv_writer::filename)) {
fs::File csv_file = FS_LIB.open(csv_writer::filename, "r");
http.sendHeader("Content-Length", String(csv_file.size()));
http.streamFile(csv_file, F("text/csv"));
csv_file.close();
} else {
http.send(204, F("text/html"), F("No data available."));
}
}
void handleDeleteCSV() {
if (!shouldBeAllowed()) {
return http.requestAuthentication(DIGEST_AUTH);
}
Serial.print("Removing CSV file...");
FS_LIB.remove(csv_writer::filename);
Serial.println(" Done!");
http.sendHeader("Location", "/");
http.send(303);
}
#endif
void handlePageNotFound() {
http.send(404, F("text/plain"), F("404: Not found"));
}
}

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#ifndef WEB_SERVER_H_
#define WEB_SERVER_H_
#if defined(ESP8266)
# include <ESP8266WebServer.h>
#elif defined(ESP32)
# include <WebServer.h>
#endif
#include "config.h"
#include "util.h"
#include "co2_sensor.h"
#ifdef AMPEL_CSV
# include "csv_writer.h"
#endif
#ifdef AMPEL_MQTT
# include "mqtt.h"
#endif
#ifdef AMPEL_LORAWAN
# include "lorawan.h"
#endif
namespace web_server {
void initialize();
void update();
}
#endif

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#include "wifi_util.h"
namespace config {
// WiFi config. See 'config.h' if you want to modify those values.
const char *wifi_ssid = WIFI_SSID;
const char *wifi_password = WIFI_PASSWORD;
#ifdef WIFI_TIMEOUT
const uint8_t wifi_timeout = WIFI_TIMEOUT; // [s] Will try to connect during wifi_timeout seconds before failing.
#else
const uint8_t wifi_timeout = 60; // [s] Will try to connect during wifi_timeout seconds before failing.
#endif
}
// Initialize Wi-Fi
void WiFiConnect(const String &hostname) {
//NOTE: WiFi Multi could allow multiple SSID and passwords.
WiFi.persistent(false); // Don't write user & password to Flash.
WiFi.mode(WIFI_STA); // Set ESP to be a WiFi-client only
#if defined(ESP8266)
WiFi.hostname(hostname);
#elif defined(ESP32)
WiFi.setHostname(hostname.c_str());
#endif
Serial.print(F("WiFi - Connecting to "));
Serial.println(config::wifi_ssid);
WiFi.begin(config::wifi_ssid, config::wifi_password);
// Wait for connection, at most wifi_timeout seconds
for (int i = 0; i <= config::wifi_timeout && (WiFi.status() != WL_CONNECTED); i++) {
led_effects::showRainbowWheel();
Serial.print(".");
}
if (WiFi.status() == WL_CONNECTED) {
led_effects::showKITTWheel(color::green);
Serial.println();
Serial.print(F("WiFi - Connected! IP address: "));
Serial.println(WiFi.localIP());
} else {
//TODO: Allow sensor to work as an Access Point, in order to define SSID & password?
led_effects::showKITTWheel(color::red);
Serial.println(F("Connection to WiFi failed"));
}
}

10
ampel-firmware/wifi_util.h Normal file
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#ifndef WIFI_UTIL_H_INCLUDED
#define WIFI_UTIL_H_INCLUDED
#include "config.h"
#include "util.h"
#include "led_effects.h"
void WiFiConnect(const String &hostname);
#endif

25
platformio.ini Normal file
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; PlatformIO Project Configuration File
;
; Build options: build flags, source filter, extra scripting
; Upload options: custom port, speed and extra flags
; Library options: dependencies, extra library storages
;
; Please visit documentation for the other options and examples
; http://docs.platformio.org/page/projectconf.html
[platformio]
src_dir = ampel-firmware
[env:esp8266]
platform = espressif8266
board = esp12e
framework = arduino
monitor_speed = 115200
lib_deps =
MCCI LoRaWAN LMIC library
build_flags =
-D ARDUINO_LMIC_PROJECT_CONFIG_H_SUPPRESS
-D CFG_eu868=1
-D CFG_sx1276_radio=1