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终端设备调用NLME_NetworkDiscoveryRequest后没有发送beacon request请求

终端设备在运行接近一天左右,会出现离网现象,而且无法回到网络中,通过串口调试信息及抓包工具查看到,终端设备调用NLME_NetworkDiscoveryRequest后,并没有发送beacon request,但是NLME_NetworkDiscoveryRequest的返回却是0,ZDO_beaconNotifyIndCB回调函数没有得到触发。

希望大牛帮忙分析下有可能是什么造成,如果改进。