资料包里面包含MQTT协议的C语言库文件，可供初学者学习和使用(The packet contains the C language library file of the MQTT protocol for beginners to learn and use)

ec20通信基于stm32单片机，MQTT协议连接移动的onenet平台。(EC20 communication is based on STM32 single chip microcomputer, mqtt protocol connects the mobile onenet platform.)