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cc2530 rejoin problem

Other Parts Discussed in Thread: CC2530, Z-STACK

Hello.

I am working one large project by using cc2530.

It is consist of one coordinator and 4 ED.

Coordinator can send 96 bytes data to ED and ED is same.

ED use battery , so i need lowest power conserve for ED. 

I use zstack 2.5.1a/sampleApp.

Issues:

1. After long time , ZDO STATE CHANGE is not changed but ED can't send packet to coordinator.

2.MCU can't communication with ED after No.

3.Zigbee network is often offline.

One of most importants is power conserve.

Help me please.

Thanks in advance.

Piao