QLabel*qlbPublishMessageTag; QLineEdit*qleHostName; QLineEdit*qleHostPort; QLineEdit*qlePublishTopic; QLineEdit*qlePublishMessage;private: QMqttClient* m_client;//mqtt client指针privateslots:voidon_btnConnect_clicked(void);//连接MQTT服务器槽函数voidon_btnPublish_clicked(void);//发布消息槽函数};#end...
log.error("===>>>MQTT topic 不存在<<==="); } MqttDeliveryToken token; try { token = mTopic.publish(message); token.waitForCompletion(); } catch (MqttPersistenceException e) { log.error("===>>>publish fail",e); e.printStackTrace(); } catch (MqttException e) { e.printStackTrace(...
MQTT(Message Queuing Telemetry Transport,消息队列遥测传输协议),是一种基于发布/订阅(publish/subscribe)模式的"轻量级"通讯协议,该协议构建于TCP/IP协议上,可以以极少的代码和有限的带宽,为连接远程设备提供实时可靠的消息服务。 三种消息发布服务质量: “至多一次”,消息发布完全依赖底层TCP/IP网络。会发生消息丢失或...
Adafruit_MQTT_Publish hass_config = Adafruit_MQTT_Publish(&mqtt, AIO_USERNAME"homeassistant/light/garden/config"); // 发布自己的开关信息 Adafruit_MQTT_Publish state_topic = Adafruit_MQTT_Publish(&mqtt, AIO_USERNAME"hachina/rgb1/light/status"); //发布自己的亮度信息 Adafruit_MQTT_Publish brightne...
in * an error. * * The communication methods of this class - `connect)`, `publish), * `subscribe()`, etc. - are all asynchronous. They create the requestfor * the server, return imediately, beforea response is received * the server, but return immediately, before a ...
三、传输transmission 传输的格式 如果payload len 长度小于126那么只需要用payload len那一段，如果payload...
info 2024-08-20 20:52:59z2m:mqtt: MQTT publish: topic 'zigbee2mqtt/Kitchen Blind', payload '{"battery":84,"charging_status":false,"device_temperature":null,"last_seen":"2024-08-20T19:52:59.071Z","linkquality":126,"motor_speed":"high","motor_state":null,"position":51,"running"...
QLineEdit*qlePublishMessage;private: QMqttClient* m_client;//mqtt client指针privateslots:voidon_btnConnect_clicked(void);//连接MQTT服务器槽函数voidon_btnPublish_clicked(void);//发布消息槽函数};#endif//QMQTTCLIENTTOOL_H //QMqttClientTool.cpp#include"QMqttClientTool.h"#include"QDebug"#include<...
实现MQTT协议需要客户端和服务器端通讯完成,在通讯过程中,MQTT协议中有三种身份:发布者 (Publish)、代理(Broker)(服务器)、订阅者(Subscribe)。其中,消息的发布者和订阅者都是客户端,消 息代理是服务器,消息发布者可以同时是订阅者。 MQTT传输的消息分为:主题(Topic)和负载(payload)两部分: ...
rc = client.publish(topic, message); while (arrivedcount == 2) client.yield(100000); if ((rc = client.unsubscribe(topic)) != 0) printf("rc from unsubscribe was %d\n", rc); if ((rc = client.disconnect()) != 0) printf("rc from disconnect was %d\n", rc); ...