#include <WiFi.h>
#include <PubSubClient.h>

// Paramètres WiFi
const char* ssid = "Wokwi-GUEST";
const char* password = "";

// Paramètres MQTT
const char* mqtt_server = "broker.hivemq.com";
const char* mqtt_topic = "esp32/led/state"; // Topic MQTT pour la LED

const int ledPin = 32; // LED sur GPIO 32
bool ledState = false;

WiFiClient espClient;
PubSubClient client(espClient);

void setup() {
  Serial.begin(115200);
  pinMode(ledPin, OUTPUT);

  // Connexion WiFi
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.println("Connecting to WiFi...");
  }
  Serial.println("Connected to WiFi");

  // Connexion MQTT
  client.setServer(mqtt_server, 1883);
  connectToMQTT();
}

void loop() {
  if (!client.connected()) {
    connectToMQTT();
  }
  client.loop();

  // Changement d’état de la LED toutes les 100 ms
  static unsigned long lastMsg = 0;
  if (millis() - lastMsg > 100) {
    lastMsg = millis();

    ledState = !ledState;
    digitalWrite(ledPin, ledState ? HIGH : LOW);

    const char* message = ledState ? "on" : "off";
    client.publish(mqtt_topic, message);
    Serial.print("LED ");
    Serial.println(message);
  }
}

void connectToMQTT() {
  while (!client.connected()) {
    Serial.println("Connecting to MQTT...");
    if (client.connect("ESP32Client")) {
      Serial.println("Connected to MQTT broker");
    } else {
      Serial.print("Failed, rc=");
      Serial.print(client.state());
      Serial.println(" trying again in 2 seconds...");
      delay(2000);
    }
  }
}