#include <WiFi.h>
#include <DHT.h>
#include <PubSubClient.h>
//DHT
#define DHTPIN 14     //設定溫濕度感測器腳位
#define DHTTYPE DHT22   // DHT 22  (AM2302), AM2321
DHT dht(DHTPIN, DHTTYPE);
// 儲存訊息的字串變數
String msgStr = "";
// 儲存字元陣列格式的訊息字串（參閱下文說明）
char json[30];

// MQTT Broker
const char *mqtt_broker = "broker.MQTTGO.io";
const char *topic = "emqx/esp32";
String client_id = "7935364904";
const char *mqtt_username = "";
const char *mqtt_password = "";
const int mqtt_port = 1883;

WiFiClient espClient;
PubSubClient client(espClient);

void setup() {
  Serial.begin(9600);
  //DHT
  dht.begin();
  Serial.print("Connecting to WiFi");
  WiFi.begin("Wokwi-GUEST", "", 6);
  while (WiFi.status() != WL_CONNECTED) {
    delay(100);
    Serial.print(".");
  }
  Serial.println(" Connected!");

  client.setServer(mqtt_broker, mqtt_port);
  while (!client.connected()) {      
      client_id += String(WiFi.macAddress());
      Serial.printf("The client %s connects to the public MQTT broker\n", client_id.c_str());
      if (client.connect(client_id.c_str(), mqtt_username, mqtt_password)) {
          Serial.println("Public EMQX MQTT broker connected");
      } else {
          Serial.print("failed with state ");
          Serial.print(client.state());
          delay(2000);
      }
  }


}

void loop() {
 //DHT
 float humidity = dht.readHumidity(); 
 float temperature = dht.readTemperature(); //"temperature"存取溫濕度感測器數值

  // 更新用戶端狀態
  client.loop();


  // 建立MQTT訊息（JSON格式的字串）
  msgStr = msgStr + "溫度:" + temperature +",濕度:"+ humidity ;  
  // 把String字串轉換成字元陣列格式
  msgStr.toCharArray(json,30);

  client.publish(topic,json);
  client.subscribe(topic);
    // 清空MQTT訊息內容
  msgStr = "";
  delay(1000); // TODO: Build something amazing!
}