使用ZDO_REJOIN_BACKOFF功能相当于开启一个timer event，如果没有join成功，可以加长尝试搜网的时间。如果加网成功了可以把这个timer event清除掉。
在协调器未加电时，节点搜索一会儿网络后进入休眠，此时节点未成功入网，所以不会进入深度睡眠。而在节点入网后才有可能进入深度睡眠状态。
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