#include <ESP8266WiFi.h>
#include <PubSubClient.h>
#include <DHT.h>
const char *ssid = "SYS123";
const char *password = "12345678";
const char* mqtt_server = "test.mosquitto.org";
const int mqtt_port = 1883;
const char* temperature_topic = "home/temp";
#define DHTPIN D3
#define DHTTYPE DHT11
DHT dht(DHTPIN, DHTTYPE);
WiFiClient espClient;
PubSubClient client(espClient);
void setup_wifi() {
  delay(10);
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.println("WiFi connected");
}
void reconnect() {
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    if (client.connect("ESP8266Client")) {
      Serial.println("connected");
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      delay(5000);
    }
  }
}
void setup() {
  Serial.begin(115200);
  setup_wifi();
  client.setServer(mqtt_server, mqtt_port);
  dht.begin();
}
void loop() {
  if (!client.connected()) {
    reconnect();
  }
  client.loop();
  float temperature = dht.readTemperature();
  if (!isnan(temperature))
  {
    Serial.print("Temperature: ");
    Serial.println(temperature);
    char tempString[8];
    dtostrf(temperature, 6, 2, tempString);
    client.publish(temperature_topic, tempString);
    broker
  } else {
    Serial.println("Failed to read temperature from DHT sensor");
  }
  delay(5000);
}