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