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CC2480 Topology Discovering

Hi, all

I am trying to use the cc2480 API, ZDO_IEEE_ADDR_REQ to discover the topology of my network. When I am trying to get the IEEE addr from the End device, the response will return staus 0x12(ZunsupportedMode) with CORRECT IEEE address.

I am wondering if this is caused by turning off the `POLLing data` from the router? However, how dose the ED return its address? Can I still use this method to discover the topology when polling is off on end devices. 

Thanks.