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

// Pin Definitions
#define DHT_PIN 4         // DHT sensor connected to GPIO4
#define DHT_TYPE DHT11    // DHT11 ya DHT22 use kar sakte ho

// WiFi Settings
const char* ssid = "Wokwi-GUEST";        // Your WiFi SSID
const char* password = "";               // Your WiFi password

// ThingsBoard Settings
const char* mqttServer = "demo.thingsboard.io"; // ThingsBoard server
const int mqttPort = 1883;                      // MQTT port
const char* accessToken = "d6FA1exBMB53pgP5dFzL";  // Access token for the device

// Create WiFi and MQTT clients
WiFiClient wifiClient;
PubSubClient client(wifiClient);
DHT dht(DHT_PIN, DHT_TYPE);

void setup() {
  Serial.begin(115200);
  dht.begin(); // DHT sensor start

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

  // Connect to ThingsBoard server
  client.setServer(mqttServer, mqttPort);
  while (!client.connected()) {
    Serial.print("Connecting to ThingsBoard...");
    if (client.connect("ESP32_Device", accessToken, NULL)) {
      Serial.println("connected");
    } else {
      Serial.print("failed with state ");
      Serial.print(client.state());
      delay(2000);
    }
  }
}

void loop() {
  if (!client.connected()) {
    while (!client.connected()) {
      Serial.print("Reconnecting to ThingsBoard...");
      if (client.connect("ESP32_Device", accessToken, NULL)) {
        Serial.println("reconnected");
      } else {
        Serial.print("failed with state ");
        Serial.print(client.state());
        delay(2000);
      }
    }
  }
  client.loop();

  // Read DHT values
  float temperature = dht.readTemperature();
  float humidity = dht.readHumidity();

  // Check if reading is valid
  if (isnan(temperature) || isnan(humidity)) {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }

  // Prepare JSON payload for ThingsBoard
  String payload = "{";
  payload += "\"temperature\":" + String(temperature) + ",";
  payload += "\"humidity\":" + String(humidity);
  payload += "}";

  // Publish data to ThingsBoard
  Serial.println("Sending data to ThingsBoard: " + payload);
  client.publish("v1/devices/me/telemetry", payload.c_str());

  // Wait for 10 seconds before sending data again
  delay(10000);
}