#include <ESP8266WiFi.h>
#include <PubSubClient.h>

// WiFi配置
const char* ssid = "YXBB";          
const char* password = "1819742305";  

// MQTT配置
const char* mqttServer = "1.95.120.104"; 
const int mqttPort = 1883;
const char* mqttUser = "zwh"; 
const char* mqttPassword = "@zwh123456";
const char* clientID = "ESP8266Client"; 

WiFiClient espClient;
PubSubClient client(espClient);

void setup() {
  Serial.begin(115200);
  
  // 连接WiFi
  WiFi.begin(ssid, password);
  Serial.print("Connecting to WiFi");
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("\nConnected! IP address: ");
  Serial.println(WiFi.localIP());

  // 设置MQTT服务器
  client.setServer(mqttServer, mqttPort);
  // 设置消息回调函数
  client.setCallback(callback); 

  // 连接MQTT代理
  connectToMQTT();
}

// MQTT消息接收回调
void callback(char* topic, byte* payload, unsigned int length) {
  Serial.print("Message arrived [");
  Serial.print(topic);
  Serial.print("]: ");
  for (int i = 0; i < length; i++) {
    Serial.print((char)payload[i]);
  }
  Serial.println();
}

// MQTT连接函数
void connectToMQTT() {
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    if (client.connect(clientID, mqttUser, mqttPassword)) {
      Serial.println("connected!");
      
      // 连接成功后订阅主题
      client.subscribe("esp/sub");
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      delay(5000);
    }
  }
}

void loop() {
  // 维持MQTT连接
  if (!client.connected()) {
    connectToMQTT();
  }
  client.loop(); // 处理MQTT消息

  // 示例：每10秒发布消息
  static unsigned long lastMsg = 0;
  if (millis() - lastMsg > 10000) {
    lastMsg = millis();
    client.publish("test", 
  "{\"device_id\": \"ZWH-2025-3-001\", "
  "\"temp\": 42, "
  "\"humi\": 23}"
);
    Serial.println("Message published");
  }
}