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什么情况下会发路由请求?

实验环境:1个协调器,1个路由器,10个终端设备,所有设备都开启了NV_RESTORE,开启了child aging。2.6.2协议栈,

1、我给终端发消息,有时候消息直接通过路由器发送给终端了,但是有的时候会进行NWK ROUTER REQUEST,并且路由请求过一次后,下次再发数据还会再路由请求,为什么会这样,请问什么时候会发送路由请求?

2、NWK Link States 里面的IC和OC分别代表什么含义?