[Tinyos-help] Help with Ack' s in CC2420TransmitP.nc

[Ramon Duato Navarro]

Hi!
Maybe someone can help me. 
I am working with TinyOs 2.1 and Micaz and want to understand
the link layer without using Packet Link Layer.


I am reading the CC2420Csma.nc CC2420TransmitP.nc file and I 


 am getting a bit confused with the ACK's 


In CC2420TransmitP.nc, when you send a packet and receive an ACK then you call


signalDone(SUCCESS);
 
and the sendDone event is signalled with SUCCESS.


But what happens when you don't receive the ACK??


As far as I have understood, you call 
call BackoffTimer.start( CC2420_ACK_WAIT_DELAY )


and when this Timer expires you call again


signalDone(SUCCESS);


(since we are in the ACK_WAIT state)




So , there are no retransmissions and you do the same signalling as if you had received the ACK.
Is that correct?
Thanks in advance!
Ramon.






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