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zstack unicasting

I am trying to implement uart to zigbee convertor and vice versa using zstack.

In my testing I have a coordinator and a router.

When i recieve data (abcdefgh) from uart i am unicasting a 10 byte array from ZR to ZC.

Actually I am receiving the unicast data send by my ZR at ZC.

But ZC is reflecting back some values to ZR

I don't understand why.

 

 

i didn't understand why this kind of data i am receiving since i am not sending anything from ZC to ZR.