main.cpp
#include <Arduino.h>
#include <WiFi.h>
#include <Wire.h>
#include <PubSubClient.h>

#define Led_G 10
#define Led_B 8

const char* ssid = "VOO-1M6KPZ1";
const char* password = "q2eEgqfysRXPh4hArg";

// const char* ssid = "TP-Link_5398";
// const char* password = "17064460";


const char* mqttServer = "192.168.0.148";
const int mqttPort = 1883;
const char* mqttUser = "ArnaudFanovard";
const char* mqttPassword = "$HomeApu$";

WiFiClient espClient;
PubSubClient client(espClient);


void setup_wifi() {
  delay(10);
  // We start by connecting to a WiFi network
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);

  WiFi.begin(ssid, password);

  while (WiFi.status() != WL_CONNECTED) {
    delay(200);
    Serial.print(".");
  }

  Serial.println("");
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
}

void callback(String topic, byte* payload, unsigned int length) {
  Serial.println();
  Serial.print("Message received on topic: ");
  Serial.println(topic);
  Serial.println("Message: ");
  String msg;

  if (topic == "Led_Test"){
    for (int i = 0; i < length; i++) {
      // Serial.print((char)payload[i]);
      msg += (char)payload[i];
    }
    Serial.println(msg);
    Serial.print("LED status: ");
    if (msg == "true" || msg == "\"On\":true"){ 
      digitalWrite(Led_G, LOW);
      Serial.println("ON"); 
    }
    else if (msg == "false" || msg == "{\"On\":false}"){ 
      digitalWrite(Led_G, HIGH);
      Serial.println("OFF");
    }
  }
  Serial.println();
  delay(10);   //adjust interval
}

void reconnect() {
  // Loop until we're reconnected
  while (!client.connected()) {
    digitalWrite(Led_B, HIGH);
    Serial.print("Attempting MQTT connection...");
    // Attempt to connect
    if (client.connect("ESP32Client",mqttUser,mqttPassword)) {
      Serial.println("connected");
      // Subscribe
      client.subscribe("Led_Test");
      digitalWrite(Led_B, LOW);
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 1 seconds");
      // Wait 5 seconds before retrying
      delay(1000);
    }
  }
}




void setup() {
  Serial.begin(9600);

  pinMode(Led_G, OUTPUT);
  pinMode(Led_B, OUTPUT);

  digitalWrite(Led_B, HIGH);

  setup_wifi();

  client.setServer(mqttServer,mqttPort);
  client.setCallback(callback);

  

}

void loop() {
  if (!client.connected()) {
    reconnect();}
  // Serial.println("...");
  client.loop();
}