[Tinyos-help] Acknowledgement

[Mayur Maheshwari]

Hi All

I have been using TinyOS 2.0 for my experiments (TelosB) and I
tried implementing a scheme which makes sure that the data packets are
actually being received at the other end (one hop) with the help of
acknowledgements. This could be implemented using the same interfaces and
handling the acknowledegments.

I was rather thinking what does the success message of  sendDone event
signify. Whether, it says that the packet has been handed over to the
Physical Layer(medium) or that packet has actually been received at the
other end (by confirming at the data link layer with acknowledgements).

I conducted an experiment with a mote programmed to send a packet to a node
addressed 3 and making it toggle the LED if the sendDone event returns
SUCCESS. Since, there was no other mote nearby so the messages should not be
acknowledged but still the LED toggled. This confirmed that the success of
sendDone event signifies that the packets have been sent into the air but
does not guarantee that they have actually been caught by the addressed
node.

My question is that whether we we need to implement any scheme which can
handle the acknowledements and hence guarantee the data has been received at
the other end or there is any TinyOS interface which can handle this.

Regards
-- 
Mayur Maheshwari(mayur.maheshwari at ieee.org)

"Karmanye Vadhikaraste Ma Phaleshu Kadachana,
Ma Karma Phala Hetur Bhurmatey Sangostva Akarmani"
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