Transmission timeouts
Setting AO=1 is required for the XBee to use the explicit receive API frame (0x91) when RF data packets are received.
This is required if the application needs indication of source or destination endpoint, cluster ID, and/or profile ID
values used in received ZigBee data packets. ZDO messages can only be received if AO=1.
XBee/XBee-PRO ZigBee RF Modules User Guide
91
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