You need to implement supervision signal from end device to coordinator by yourself if you wand to reflect that end device goes off network. However, there is trade-off between power consumption and supervision frequency. Fast supervision frequency make you can detect ZED goes off network immediately but will consume more power. For the timing of firing leave request, there is only one limitation which is ZED must be alive in network. Otherwise, it won't response to leave request and it won't be removed from association table just as I describe in above posts.
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