mqtt的C语言客户端，本压缩包文件可以做到订阅话题、并在接收到消息之后驱动相应LED灯开闭、呼吸等。已经在树莓派上面测试通过-mqtt C language clients can do this compressed file subscr iption topic, and after receiving the message-driven opening and closing the corresponding LED lights, breathing. Raspberry Pi has been tested by the above