中文：在使用MQTT的订阅功能时，遇到了一些问题。我无法收到消息。多方求解无效，请问是哪里出了问题？谢谢！
English:I encountered some issues while using MQTT's subscription feature. I am unable to receive the message.Multi party solution is ineffective. May I ask where the problem lies? thank you!
Chinese "班" and "班级" means "class".
Chinese "测试" means "test".
Chinese "新" means "new".
Chinese "通知" means "notice".
Chinese "消息" means "message".
Chinese "收到的" means "received".
My English is not well.Sorry!
(fanyi.baidu.com)
I'm test in WSA.
我在WSA中测试。