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CC2530: network hanging

Part Number: CC2530
Other Parts Discussed in Thread: Z-STACK

hello,

I'm using cc2530 nodes to run a zigbee network. for now I have a coordinator and two end devices. the first end device easily joins the network and sends periodically 7 byte message packets successfully. when I start the second end device it makes the announcement and gets its short address, but it can't send the next packet and prevent the first one too!!! so the network stops. what it is about and how can I fix this?

thank you