Subscribes a gadget to a channel.

订阅到信道的 gadget。

Branch - policy branch to which this system subscribes.

branch—系统订阅的策略组。

Subscribes with the broker to receive StateChange notifications.

向代理程序订阅以收到StateChange通知消息。

The Timeline service subscribes to all events it is interested in.

时间轴服务订阅其感兴趣的所有事件。

It also handles the responses from the SUBSCRIBES that are sent out.

它也会处理从SUBSCRIBES发出的响应。