1、通过配置文件，配置MQTT服务器地址，和发布订阅topic。 2、订阅topic实现sqlite3数据本地化功能。 3、定时监测sqlite3来实现数据上报功能。 4、记录可能出现的问题及应对方式（可不实现，描述思路即可）
学习Linux系统编程的测试代码
学习Linux下的网络编程测试代码
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