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About Parent's Associated Device List

Hello everyone. 

I'm using ZStack 2.5.1.a with cc2530 and cc2531 devices and my system has 1 coordinator, 13 routers and 7 end devices.

Coordinator opens permit join to let other device join the network. 

After the end device joining the network, it sent Enroll Request Command to coordinator every 5 second until it receive  Enroll Response with status success(0x00).

The problem is that sometimes the coordinator doesn't send Enroll Response because of route discovery for the end device failing. The parent of end device doesn't send route reply.    

Recently I find out when the problem happened, I can't find end device in the associated device list of it's parent. That is why route discovery fail.

But the end device can send message through it's parent.  That is strange. I think that there are some mistakes in associated device list of parent when device

joining. 

This problem happened even I update router to Z-Stack HA 1.2.1.

Please help.

Thanks