This article has explained how to create a fully functional MQTT subscription client.
本文介绍了如何创建能完全正常运行的MQTT订阅客户机。
The subscribed method is called by the client when a subscription request has been acknowledged by the broker.
当代理确认了订阅请求后，即调用订阅方法。
When users start the synchronization client software on the device, they choose which subscription set to synchronize.
当用户启动设备上的同步客户机软件时，他们选择要同步的订阅集。
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