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1、我让终端设备进入休眠状态，路由设备发送单播消息后，等待终端节点data request。请问路由设备保存这个消息的时间是多少？怎么更改？
2、路由设备发送广播设备，也会保存一段时间么？请问这个时间是多少，怎么更改
