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还是关于child aging

场景如下,一个协调器下带了一个路由,路由下又带了几个终端,终端和路由之间通过child aging保持连接,终端处于低功耗,定时唤醒向路由发心跳,如果有终端离网中断心跳,路由向协调器报告该离网事件,但如果路由断电了,那协调器该如何得知剩余终端的在线情况?