Subscribes with the broker to receive StateChange notifications.

向代理程序订阅以收到StateChange通知消息。

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In this scenario the Sensor and the M.A.P.E. Loop are publishers (they publish StateChange and Restart topics, respectively).

在该场景中，Sensor和M.A.P.E . Loop是发布者(它们分别地发布StateChange和Restart主题)。

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Sensor — This performs the monitoring of the log file and publishes a StateChange topic with the broker, every time a new state change entry is added to the log file.

Sensor——它执行对日志文件的监视，并且，每当添加一条新的状态改变条目到日志文件中，便利用Broker(代理)发布一个StateChange主题。

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