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network ACK failure in API response

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while trying to communicate with a router node in api mode the controller returns the status with 0x21 corresponding to ntwrk ack failure...can any one shed some light on this..?
thanks in advance
asked Aug 27, 2014 in IEEE 802.15.4 by sarathtv2 New to the Community (2 points)

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1 Answer

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What this means is that one of the ACKs within the Zigbee protocol failed to indicate that the packet was received. In this case, it is the Network ACK that failed. unless you are using Application level Acks and have received the corresponding ACK, I would suggest re-transmitting the packet.
answered Aug 27, 2014 by mvut Veteran of the Digi Community (11,755 points)