#include<WiFi.h>
#include<PubSubClient.h>
#include <Ethernet.h>
#include <SPI.h>
#include "DHT.h"
#define dhtPin 27      //讀取DHT11 Data
#define dhtType DHT11 //選用DHT11

DHT dht(dhtPin, dhtType); // Initialize DHT sensor

const char*ssid = "e710-2";
const char*password = "e710e710";
const char*mqttServer = "broker.mqtt-dashboard.com";
const int mqttPort = 1883;
const char* mqttUserName = "";  // 使用者名稱，隨意設定。
const char* mqttPwd = "";  // MQTT密碼
const char* clientID = "";
const char topic[] = "esp32/test456";
String msgStr = "";
char json[25];

unsigned long atime = millis();
unsigned long btime;

WiFiClient espClient;
PubSubClient client(espClient);

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

void reconnect() {
  while (!client.connected()) {
    if (client.connect(clientID, mqttUserName, mqttPwd)) {
      Serial.println("MQTT connected");
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      delay(5000);  // 等5秒之後再重試
    }
  }
}


void  setup() {
  Serial.begin(115200);
  setup_wifi();
  client.setServer(mqttServer, mqttPort);
  reconnect();
  client.subscribe("esp32/test456");
  dht.begin();
}

void loop() {
  if (!client.connected()) {
    reconnect();
  }
  client.loop();
  btime = millis();

  if ((btime - atime) >= 5000) {
    float h = dht.readHumidity();//讀取濕度
    float t = dht.readTemperature();//讀取攝氏溫度
    float f = dht.readTemperature(true);//讀取華氏溫度
    if (isnan(h) || isnan(t) || isnan(f)) {
      Serial.println("無法從DHT傳感器讀取！");
      return;
    }
    Serial.print("濕度: ");
    Serial.print(h);
    Serial.print("%\t");
    Serial.print("攝氏溫度: ");
    Serial.print(t);
    Serial.print("*C\t");
    Serial.print("華氏溫度: ");
    Serial.print(f);
    Serial.print("*F\n");
    msgStr = msgStr + "temp: " + t + " humid: " + h +"%";
    msgStr.toCharArray(json, 25);
    client.publish(topic, json);
    msgStr = "";
    atime = btime;
  }

}