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

const int DHT_PIN = 15;

DHTesp dhtSensor;

// ThingsBoard MQTT Broker 정보 설정
const char* mqttServer = "handa-tech.iptime.org";  // ThingsBoard 서버 주소
const int mqttPort = 1883;                          // MQTT 포트
const char* deviceEndpoint = "v1/devices/me/rpc";
const char* deviceAccessToken = "esp32_dht11";

WiFiClient espClient;
PubSubClient client(espClient);
float t_value = 0.0;
float h_value = 0.0;

void setup() {
  Serial.begin(115200);
  dhtSensor.setup(DHT_PIN, DHTesp::DHT22);
  Serial.print("Connecting to WiFi");
  WiFi.begin("Wokwi-GUEST", "", 6);
  while (WiFi.status() != WL_CONNECTED) {
    delay(100);
    Serial.print(".");
  }
  Serial.println(" Connected!");

  // ThingsBoard MQTT 연결
  client.setServer(mqttServer, mqttPort);

  while (!client.connected()) {
    if (client.connect("ESP32Client", deviceAccessToken, "")) {
      Serial.println("Connected to ThingsBoard MQTT");
      subscribeToRPC();
    } else {
      Serial.print("Failed, rc=");
      Serial.print(client.state());
      Serial.println(" Retrying in 5 seconds...");
      delay(5000);
    }
  }
}

void subscribeToRPC() {
  String rpcSubscriptionTopic = String(deviceEndpoint) + "/" + deviceAccessToken + "/rpc/request/+";
  client.subscribe(rpcSubscriptionTopic.c_str());
  Serial.println("Subscribed to RPC requests");
}

void loop() {
  client.loop();
  delay(30000); // Wait for a new reading from the sensor (DHT22 has ~0.5Hz sample rate)
  TempAndHumidity  data = dhtSensor.getTempAndHumidity();
  t_value += 0.01;
  h_value += 0.01;

  Serial.println("Temp: " + String(t_value, 2) + "°C");
  Serial.println("Humidity: " + String(h_value, 2) + "%");
  Serial.println("---");

  // ThingsBoard로 데이터 전송
  String payload = "{\"temperature\":" + String(t_value, 2) + ", \"humidity\":" + String(h_value, 2) + "}";
  client.publish(deviceEndpoint, payload.c_str());
}

void callback(char* topic, byte* payload, unsigned int length) {
  // RPC 요청이 도착하면 이 함수가 호출됩니다.
  Serial.println("RPC request received");
  Serial.print("Topic: ");
  Serial.println(topic);
  Serial.print("Payload: ");
  for (int i = 0; i < length; i++) {
    Serial.print((char)payload[i]);
  }
  Serial.println();

  // 여기에서 RPC에 대한 응답을 처리할 수 있습니다.
  // 예를 들어, 특정 명령을 수행하고 결과를 응답할 수 있습니다.
  // 처리된 결과를 응답으로 ThingsBoard에게 보내기 위해 아래와 같이 publish할 수 있습니다.
  // client.publish(topic, "결과 데이터");
}