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

// Pot pin used is 34
#define varvolt 34          // GPIO 34

// Replace with your Wi-Fi credentials
const char* ssid = "Wokwi-GUEST";        // Your Wi-Fi SSID
const char* password = ""; // Your Wi-Fi password

// MQTT Broker settings  
const char* mqtt_server = "broker.emqx.io"; 

const int mqtt_port = 1883; // Standard MQTT port

// MQTT Topics
#define POT_TOPIC "home/esp32/var"
// Initialize DHT sensor

// Wi-Fi and MQTT clients
WiFiClient espClient;
PubSubClient client(espClient);

// Function to connect to Wi-Fi
void setup_wifi() {
  delay(10);
  // Connect to Wi-Fi
  Serial.println();
  Serial.print("Connecting to WiFi...");
  WiFi.begin(ssid, password);

  while (WiFi.status() != WL_CONNECTED) {
    delay(250);
    Serial.print(".");
  }
  Serial.println("Connected to WiFi");
}

// Reconnect to MQTT if disconnected
void reconnect() {
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    // Create a random client ID
    String clientId = "ESP32Client-" + String(random(0xffff), HEX);
    
    if (client.connect(clientId.c_str())) {
      Serial.println("Connected to MQTT broker");
    } else {
      Serial.print("Failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      delay(5000);
    }
  }
}

void setup() {
  // Start the Serial Monitor
  Serial.begin(115200);
  // Connect to Wi-Fi
  setup_wifi();
  
  // Input
  pinMode(varvolt, INPUT);  
  // Set MQTT server
  client.setServer(mqtt_server, mqtt_port);
}

void loop() {
  if (!client.connected()) {
    reconnect(); // Reconnect if the connection to MQTT is lost
  }
  
  // Read potentiometer value and print on the serial monitor
   int value=analogRead(varvolt);
   Serial.println(value);
     
  // Publish pot value to MQTT broker on separate topics
 
  client.publish(POT_TOPIC, String(value).c_str());
 

  // Wait before publishing again
  delay(5000);  // Publish every 5 seconds
}