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

// Replace with your network credentials
const char* ssid = "YOUR_SSID";
const char* password = "YOUR_PASSWORD";

// Replace with your ThingsBoard instance and token
const char* mqtt_server = "YOUR_THINGSBOARD_SERVER";
const char* token = "ccD7Hcq1crrAPrLrbhRN";

// Initialize the WiFi and MQTT client objects
WiFiClient espClient;
PubSubClient client(espClient);

// Analog pin connected to the potentiometer
const int potPin = 34;

void setup() {
  // Initialize Serial Monitor
  Serial.begin(115200);
  delay(10);
  
  // Connecting to WiFi
  setup_wifi();
  
  // Set the MQTT server
  client.setServer(mqtt_server, 1883);
}

void setup_wifi() {
  delay(10);
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);

  WiFi.begin(ssid, password);

  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }

  Serial.println("");
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
}

void reconnect() {
  // Loop until we're reconnected
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    // Attempt to connect
    if (client.connect("ESP32Client", token, "")) {
      Serial.println("connected");
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 3 seconds");
      // Wait 3 seconds before retrying
      delay(3000);
    }
  }
}

void loop() {
  if (!client.connected()) {
    reconnect();
  }
  client.loop();
  
  // Read the value from the potentiometer
  int potValue = analogRead(potPin);
  
  // Print the potentiometer value to the Serial Monitor
  Serial.print("Potentiometer value: ");
  Serial.println(potValue);
  
  // Prepare payload in JSON format
  String payload = "{\"adc_value\":";
  payload += potValue;
  payload += "}";
  
  // Publish the payload to ThingsBoard
  if (client.publish("v1/devices/me/telemetry", payload.c_str())) {
    Serial.println("Data sent successfully");
  } else {
    Serial.println("Failed to send data");
  }
  
  // Delay for a second before next reading
  delay(100);
}