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

// Replace with your network credentials
const char* ssid = "Wokwi-GUEST";
const char* password = "";

// Replace with your MQTT broker details
const char* mqttServer = "localhost";
const int mqttPort = 1883;

// Replace with your LED pin
const int ledPin = 5;

WiFiClient espClient;
PubSubClient client(espClient);

void setup() {
  // Start Serial Monitor
  Serial.begin(115200);

  // Connect to Wi-Fi
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(250);
  }
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());

  // Set the LED pin as an output
  pinMode(ledPin, OUTPUT);

  // Set up MQTT client
  client.setServer(mqttServer, mqttPort);
}

void loop() {
  if (!client.connected()) {
  digitalWrite(ledPin, HIGH); // turn the LED on
  delay(500);                  // wait for 500 milliseconds
  digitalWrite(ledPin, LOW);  // turn the LED off
  delay(500); 
  }
  
  }