MQTT成功连接之后，就可以发布消息了。

After MQTT is successfully connected, messages may be published.

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在图3所示的体系结构中，传感器组件还必须将包括实际事件对象的通知消息发布到连接层中的代理组件。

In the architecture depicted in Figure 3, the sensor component must also publish a notification message that includes the actual event object to the broker component in the connectivity layer.

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现在我们有一个多后台案例，一个需要在多个后台创建的应用程序，所有事务的发布包括连接都经过它。

Now we have the case of multiple backends, an application that needs to be created on multiple backends, all transaction issues including consistency should be there.

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