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

#define POT_PIN 34
#define MQTT_SERVER "broker.hivemq.com"
#define MQTT_PORT 1883
#define TOPIC "potentiometer"

const char* ssid = "Wokwi-GUEST";
const char* password = "";

WiFiClient espClient;
PubSubClient client(espClient);

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

  // Connect to WiFi
  Serial.println("Connecting to WiFi...");
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("\nWiFi connected!");

  // Set up MQTT
  client.setServer(MQTT_SERVER, MQTT_PORT);
}

void reconnect() {
  // Reconnect to MQTT
  while (!client.connected()) {
    Serial.println("Attempting MQTT connection...");
    if (client.connect("ESP32Publisher")) {
      Serial.println("Connected to MQTT broker");
    } else {
      Serial.println("Failed to connect, retrying in 5 seconds...");
      delay(5000);
    }
  }
}

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

  // Read potentiometer value
  int potValue = analogRead(POT_PIN);
  char potStr[8];
  itoa(potValue, potStr, 10);

  // Publish potentiometer value
  client.publish(TOPIC, potStr);
  Serial.print("Published: ");
  Serial.println(potStr);

  delay(1000); // Delay for 1 second
}