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Secondary IEEE address

Other Parts Discussed in Thread: CC2538

Q1 -Why there are 2 IEEE addresses defined or allowed for ZigBee device?

My understanding was IEEE address(or MAC address) is a unique address hardwired by manufacturer and can not be changed. So why having a second address??

Also, In Zstack tells  four-level hierarchy to determine the IEEE address

1.Read from Z-Stack non-volatile memory
2. Look-up from Secondary IEEE location
3. Look-up from Primary IEEE location
4.Create temporary using random number generation

Please advise how/why  a device has multiple IEEE addresses?

Q2- If I have a custom CC2538 board which has programmed with ZStack as coordinator, how can I read the device IEEE address? Is there a MT command to request IEEE address of a coordinator that is connected to PC via serial port?

Thanks in advance.