Gujiawei-Edinburgh commented on issue #212:
URL: https://github.com/apache/bifromq/issues/212#issuecomment-3760627687
> 希望应用端可以获取到 设备的 在线 和离线状态 1、场景：应用程序有可能需要停止服务，导致 没有收到 event 事件，会导致 设备状态 错误
2、想法：希望可以获取到 设备端发送的 心跳包，和心跳发生时间间隔，辅助判断设备在线状态，比如 设备端 每 60 s 发生一次心态包
，如果接收到心态包，设备为在线状态 ，如果 超过 规定时间，则为 离线状态。
1. If you want to receive **PING events**, there is a `PingReq` event in the
system.
This event is **only enabled when `debugMode` is set to `true`** (it is
`false` by default).
You can enable it via your custom `SettingProvider`.
2. For **Keep Alive**, the value is available in the `ClientConnected` event
as
`keepAliveTimeSeconds`.
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