Hi M10....
One way is get the IEEE address of device when it joins to the networks using
GenericApp_ProcessZDOMsgs( zdoIncomingMsg_t *inMsg )
{ ....
case Device_annce:
....
}
Here you have the example code --> http://processors.wiki.ti.com/index.php/Z-Stack_FAQ#How_to_get_the_address_of_new_devices_joining_the_network
If you find another way ... share with us
Regards