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

// WiFi credentials
const char *ssid = "Wokwi-GUEST";
const char *password = "";

// ThingsBoard credentials
#define TOKEN "YOUR_DEVICE_TOKEN" // Replace with your ThingsBoard device token
const char *thingsboardServer = "thingsboard.cloud";

// DHT sensor setup
#define DHTPIN 2  // Pin where the DHT sensor is connected
#define DHTTYPE DHT22  // DHT 22 (AM2302)
DHT dht(DHTPIN, DHTTYPE);

WiFiClient espClient;
PubSubClient client(espClient);
ThingsBoard tb(client);

unsigned long lastSend;

void setup() {
  Serial.begin(115200);
  dht.begin();
  delay(10);

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

  // Initialize ThingsBoard connection
  client.setServer(thingsboardServer, 1883);
  lastSend = 0;
}

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

  if (millis() - lastSend > 1000) { // Update and send every 1 second
    sendDataToThingsBoard();
    lastSend = millis();
  }

  tb.loop();
}

void sendDataToThingsBoard() {
  Serial.println("Reading sensor data");

  // Reading temperature or humidity
  float humidity = dht.readHumidity();
  // Temperature in Celsius
  float temperature = dht.readTemperature();

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

  Serial.println("Sending data to ThingsBoard:");
  Serial.print("Humidity: ");
  Serial.print(humidity);
  Serial.print(" %\t");
  Serial.print("Temperature: ");
  Serial.print(temperature);
  Serial.println(" °C ");

  tb.sendTelemetryFloat("temperature", temperature);
  tb.sendTelemetryFloat("humidity", humidity);
}

void reconnect() {
  // Loop until reconnected
  while (!tb.connected()) {
    Serial.print("Connecting to ThingsBoard...");
    if (tb.connect("ESP32_Device", TOKEN)) {
      Serial.println("connected");
    } else {
      Serial.print("failed, rc=");
      Serial.print(tb.state());
      Serial.println(" try again in 5 seconds");
      delay(5000);
    }
  }
}