#include <WiFi.h>  
#include <PubSubClient.h>
const char* ssid ="Wokwi-GUEST";
const char* password = "";


//const char* ssid = "YourWiFiSSID";
//const char* password = "YourWiFiPassword";
const char* mqtt_server = "91.121.93.94";
const int ledPin =5; // GPIO pin to which the LED is connected


//const char *ssid = "Idoom 4G_ECD58";
//const char *password = "Kerajetconnection4g00";
//const char *mqtt_server = "192.168.0.127";

const char *mqtt_client_id = "mqtt-explorer-791b1ed5";
const char *mqtt_topic = "esp32/led";

const int pinLED = 5;

WiFiClient espClient;
PubSubClient client(espClient);

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

  pinMode(pinLED, OUTPUT);
  digitalWrite(pinLED, LOW);

  setup_wifi();
  client.setServer(mqtt_server, 1883);
  client.setCallback(callback);
}

void setup_wifi() {
  delay(10);
  Serial.println("Connecting to WiFi...");
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting to WiFi...");
  }
  Serial.println("Connected to WiFi");
}

void callback(char *topic, byte *payload, unsigned int length) {
  Serial.println("Message received: ");
  Serial.println(topic);
  String message;
  for (int i = 0; i < length; i++) {
    message += (char)payload[i];
  }

  if (String(topic) == mqtt_topic) {
    if (message == "on") {
      digitalWrite(pinLED, HIGH);
    } else if (message == "off") {
      digitalWrite(pinLED, LOW);
    }
  }
}

void reconnect() {
  while (!client.connected()) {
    Serial.println("Attempting MQTT connection...");
    if (client.connect(mqtt_client_id)) {
      Serial.println("Connected to MQTT broker");
      client.subscribe(mqtt_topic);
    } else {
      Serial.print("Failed, rc=");
      Serial.print(client.state());
      Serial.println(" Retrying in 5 seconds...");
      delay(5000);
    }
  }
}

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