使用PubSubClient 与 MQTT Broker 建立连接。 client.setServer(mqtt_broker, mqtt_port); client.setCallback(callback);while(!client.connected()) { String client_id ="esp32-client-"; client_id += String(WiFi.macAddress()); Serial.printf("The client %s connects to the public MQTT broker\n"...
//connecting to a mqtt broker client.setServer(mqtt_broker, mqtt_port); client.setCallback(callback); while (!client.connected()) { String client_id = "esp8266-client-"; client_id += String(WiFi.macAddress()); Serial.println("Connecting to public emqx mqtt broker..."); //提示连接...
为了确认每条订阅,代理者会向订阅者发送一条SUBACK确认消息,该消息包含有原始订阅消息的数据包标识符packetId,以及一个返回码returnCode列表。 数据包标识符packetId:数据包的唯一标识符,与SUBSCRIBE订阅消息当中的packetId保持一致; 返回码returnCode:代理者会为在SUBSCRIBE消息当中接收到的每个topic/qos响应一个返回码,...
pinMode(BUILTIN_LED,OUTPUT);// Initialize the BUILTIN_LED pin as an output Serial.begin(115200); setup_wifi(); //配置mqtt服务器地址和端口 client.setServer(mqtt_server,1883); //设置订阅消息回调 client.setCallback(callback); } voidloop() { //重连机制 if(!client.connected()) { reconne...
[2]; sem_t discon_sem; int pubmsg_d = -1; int submsg_d = -1; msgbuf subMsg = {1, 0}; msgbuf pubMsg = {2, 0}; MQTTClient client; //定义一个MQTT客户端client MQTTClient_connectOptions conn_opts = MQTTClient_connectOptions_initializer; //传递给MQTTClient_setCallbacks的回调函数...
()); // 服务器id设置为wifi的物理地址WiFiClientespClient;PubSubClientclient(espClient);// MQTT监听函数voidmqttCallback(char*topic,byte*payload,unsignedintlength){Serial.print("Message arrived in topic: ");Serial.println(topic);Serial.print("Message:");StringcharPayload;for(inti =0; i < ...
client.connect(mqtt_devid, mqtt_pubid, mqtt_password); //客户端连接到指定的产品的指定设备.同时输入鉴权信息 client.setCallback(callback); //设置好客户端收到信息是的回调 tim1.attach(20, sendTempAndHumi); //定时每20秒调用一次发送数据函数sendTempAndHumi ...
PubSubClientmqttClient(wifiClient);constbyteledPin = LED_BUILTIN;// 需要控制的led灯voidsetup(){Serial.begin(9600);//设置ESP8266工作模式为无线终端模式WiFi.mode(WIFI_STA);// 连接WiFiconnectWifi();// 设置MQTT服务器和端口号mqttClient.setServer(mqttServer,1883);// 连接MQTT服务器connectMQTTServer...
if (status == MQTT_CONNECT_ACCEPTED) {printf("mqtt_connection_cb: Successfully connected\n");/* 为收到PUB消息注册回调函数 */mqtt_set_inpub_callback(client, mqtt_incoming_publish_cb, mqtt_incoming_data_cb, arg);/* SUB */mqtt_subscribe(client, SUB_TOPIC,1, mqtt_sub_request_cb, arg)...
(client.state());Serial.println(" try again in 5 seconds");// Wait 5 seconds before retryingdelay(5000);}}}voidsetup(){Serial.begin(115200);// setup_wifi;client.setServer(mqtt_server,mqtt_port);client.setCallback(callback);}voidloop(){if(!client.connected()){reconnect();}client....