arduino_r4_mqttha/HomeAssistantMQTTDiscovery.ino

#include <WiFiS3.h>
#include <PubSubClient.h>
#include "HAMqttDevice.h"

// Informations WiFi
const char* ssid = "WifiHome2";
const char* password = "louca2212";

// Informations MQTT
const char* mqtt_server = "10.0.0.3";
const int mqtt_port = 1883;

// Objets WiFi et MQTT
WiFiClient wifiClient;
PubSubClient mqttClient(wifiClient);

// Identifiants pour Home Assistant
const String uniqueID = "temp01ae";  // Identifiant unique pour le capteur
const String haPrefix = "homeassistant";  // Préfixe pour le topic de découverte Home Assistant
const String sensorName = "sensorBedroomT"; // Nom du capteur
const String deviceName = "Bedroom"; // Nom de l'appareil

void setup() {
  Serial.begin(115200);

  // Connexion au WiFi
  connectWiFi();

  // Configuration du client MQTT
  mqttClient.setServer(mqtt_server, mqtt_port);
  
  // Connexion au serveur MQTT
  connectMQTT();

  // Construire le topic de configuration
  String configTopic = haPrefix + "/sensor/" + sensorName + "/config";

  // Message de configuration pour Home Assistant
  String configPayload = "{";
  configPayload += "\"device_class\":\"temperature\",";
  configPayload += "\"state_topic\":\"" + haPrefix + "/sensor/" + sensorName + "/state\",";
  configPayload += "\"unit_of_measurement\":\"°C\",";
  configPayload += "\"value_template\":\"{{ value_json.temperature}}\",";
  configPayload += "\"unique_id\":\"" + uniqueID + "\",";
  configPayload += "\"device\":{";
  configPayload += "\"identifiers\":[\"" + deviceName + uniqueID + "\"],";
  configPayload += "\"name\":\"" + deviceName + "\",";
  configPayload += "\"manufacturer\":\"Example sensors Ltd.\",";
  configPayload += "\"model\":\"K9\",";
  configPayload += "\"serial_number\":\"12AE3010545\",";
  configPayload += "\"hw_version\":\"1.01a\",";
  configPayload += "\"sw_version\":\"2024.1.0\",";
  configPayload += "\"configuration_url\":\"https://example.com/sensor_portal/config\"";
  configPayload += "}";
  configPayload += "}";

  // Affichage du message de configuration sur la console série
  Serial.println("Envoi du message de configuration Home Assistant :");
  Serial.println("Topic : " + configTopic);
  Serial.println("Payload : " + configPayload);

  // Publier la configuration de l'appareil sur le topic MQTT
  mqttClient.publish(configTopic.c_str(), configPayload.c_str(), true);
}

void loop() {
  if (!mqttClient.connected()) {
    connectMQTT();
  }

  // Simuler une mesure de température (remplacer par une mesure réelle)
  float temperature = analogRead(A0) * (5.0 / 1023.0) * 100.0;

  // Préparer le message d'état
  String statePayload = "{\"temperature\":" + String(temperature) + "}";
  String stateTopic = haPrefix + "/sensor/" + sensorName + "/state";

  // Affichage du message d'état sur la console série
  Serial.println("Envoi du message d'état :");
  Serial.println("Topic : " + stateTopic);
  Serial.println("Payload : " + statePayload);

  // Publier la valeur du capteur de température dans Home Assistant
  mqttClient.publish(stateTopic.c_str(), statePayload.c_str());

  // Gestion du client MQTT
  mqttClient.loop();

  // Attendre 10 secondes avant la prochaine mesure
  delay(10000);
}

void connectWiFi() {
  Serial.print("Connexion à ");
  Serial.println(ssid);

  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.print(".");
  }

  Serial.println("\nWiFi connecté");
  Serial.print("Adresse IP : ");
  Serial.println(WiFi.localIP());
}

void connectMQTT() {
  while (!mqttClient.connected()) {
    Serial.print("Connexion au serveur MQTT...");

    if (mqttClient.connect("ArduinoClient")) {
      Serial.println("connecté");

      // Assurez-vous de publier le message de configuration juste après la connexion
      String configTopic = haPrefix + "/sensor/" + sensorName + "/config";
      String configPayload = "{";
      configPayload += "\"device_class\":\"temperature\",";
      configPayload += "\"state_topic\":\"" + haPrefix + "/sensor/" + sensorName + "/state\",";
      configPayload += "\"unit_of_measurement\":\"°C\",";
      configPayload += "\"value_template\":\"{{ value_json.temperature}}\",";
      configPayload += "\"unique_id\":\"" + uniqueID + "\",";
      configPayload += "\"device\":{";
      configPayload += "\"identifiers\":[\"" + deviceName + uniqueID + "\"],";
      configPayload += "\"name\":\"" + deviceName + "\",";
      configPayload += "\"manufacturer\":\"Example sensors Ltd.\",";
      configPayload += "\"model\":\"K9\",";
      configPayload += "\"serial_number\":\"12AE3010545\",";
      configPayload += "\"hw_version\":\"1.01a\",";
      configPayload += "\"sw_version\":\"2024.1.0\",";
      configPayload += "\"configuration_url\":\"https://example.com/sensor_portal/config\"";
      configPayload += "}";
      configPayload += "}";

      Serial.println("Envoi du message de configuration Home Assistant :");
      Serial.println("Topic : " + configTopic);
      Serial.println("Payload : " + configPayload);

      // Publier la configuration de l'appareil sur le topic MQTT
      if (mqttClient.publish(configTopic.c_str(), configPayload.c_str(), true)) {
        Serial.println("Message de configuration envoyé avec succès");
      } else {
        Serial.println("Échec de l'envoi du message de configuration");
      }
    } else {
      Serial.print("Échec de la connexion, rc=");
      Serial.print(mqttClient.state());
      Serial.println("; nouvelle tentative dans 5 secondes");

      delay(5000);
    }
  }
}