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终端断网重启后如何知道自己之前状态

 Dear TI:       

        在HA1.2 中将Switch设为协调器,Light设为终端,在试验中Light可能与协调器断开后重启,重启后的状态为初始状态,那么它怎么知道重启之前的状态?每次状态改变后都在flash写状态,重启后读取能都可行吗?还有其他的办法吗?

谢谢