How to recognize ACK event

[Hongwei Zhang]

>>Which HostAP function is called when the ACK for
>>current frame is received?
>>    
>>
>
>prism2_tx_ev() will be called for successfully transmitted frames.
>However, please note that more than one frame may be pending in hw
>queue, so "current frame" is somewhat unclear concept.
>
Just to share my recent experience with hostap-ver-0.1.3, I found that 
multiple TX interrupts seem to pop up for the transmission of a single 
short UDP packet. This happens to unicast packets, but does not happen 
to broadcast packets. I wonder what may be the cause for this phenomenon?

Thanks,

Hongwei

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