1. 轻量级物联网协议 — MQTT MQTT全称 Message Queuing Telemetry Transport,即消息队列遥测传输协议,是一种基于发布 publish/订阅 subscribe 模式的"轻量级"通讯协议。 MQTT 协议构建于TCP/IP 协议上,基于 TCP 传输方式,是一个基于客户端-服务器的消息发布/订阅传输协议。 MQTT 协议轻量、简单、开放,特别适合端与...
We will use an example python script to publish messages, process the publish acknowledgements and examine QOS (quality of service) settings. Important Note feb 2024:The MQTT Python client has been upgraded to version 2.The code examples were written in version 1.5 . The change appears only to...
您需编写程序调用aiot_mqtt_sign.c中的aiotMqttSign()函数计算MQTT连接参数,实现接入物联网平台和通信。 开发说明和示例代码如下: 调用aiotMqttSign()接口,生成连接MQTT服务端的三个建连参数clientId、username和password。 #define EXAMPLE_PRODUCT_KEY "a11xsrW***" #define EXAMPLE_DEVICE_NAME "paho_***" ...
本篇的重点是解析paho mqtt官方例程,学习它的一些结构体、API和回调的处理,然后再学习下Linux中的线程和线程间数据通信,掌握相关API的使用,最后综合起来,使用多线程publish或处理subscribe的主题的消息,将订阅的温湿度消息解析出来在LVGL的表格中用折线图的方式显示出来。 温湿度监控系统应用开发所有文章 【嵌入式Linux...
paho-mqtt是Python的一个MQTT客户端库,提供了方便的API用于发布和订阅MQTT消息。 发布字节数组可以通过paho-mqtt库实现。首先,需要安装paho-mqtt库,可以使用pip命令进行安装: 代码语言:txt 复制 pip install paho-mqtt 接下来,可以使用以下代码示例发布字节数组:...
您需编写程序调用aiot_mqtt_sign.c中的aiotMqttSign()函数计算MQTT连接参数,实现接入物联网平台和通信。 开发说明和示例代码如下: 调用aiotMqttSign()接口,生成连接MQTT服务端的三个建连参数clientId、username和password。 #define EXAMPLE_PRODUCT_KEY "a11xsrW***" #...
Recently I tried to publish and subscribe message through AWS IOT service. Here is how I processed it: Subscribe to topic "Sensor/+/reading" (Subscribe.py) Publish the data to topic "Sensor/livingroom/reading" (Publish.py) However, every time I published the data to AWS IOT MQTT server,...
I have tested the example program on paho-mqtt, and I know that the function loop_forever() can handles reconnecting. But my question is that, although loop_forever() can reconnect, it cannot re-subscribe. It should be a problem when the server suddenly crashes, in this case,...
subscribe to topic: /a1 jAqFaOZng s nart t he rno ne t e r/C le arA larn publish device status successfully : tenprature . 25. hunidity . 36 publish device status successfully : tenprature = 24. hunidity = 36 订阅两个主题: publish device status successfully : tenprature = 24. hun...
"MQTTPacket/src/MQTTSerializePublish.c", "MQTTPacket/src/MQTTSubscribeClient.c", "MQTTPacket/src/MQTTSubscribeServer.c", "MQTTPacket/src/MQTTUnsubscribeClient.c", "MQTTPacket/src/MQTTUnsubscribeServer.c", ] lite_library("pahomqtt_static") { ...