[Tinyos-help] Acknowledgments (Mohammed Biloo)

[Imran Ansari]

Hi Mohammed,

 

The solution and explanation given to my problem seems to solve my problem. I very much appreciate your help. I will try it and get back to you if I need further assistance. Thank you.

 

Kind regards,

Imran Shafique Ansari
 




Date: Thu, 9 Jul 2009 15:33:01 -0400
From: mohammed.billoo at gmail.com
To: tinyos-help at millennium.berkeley.edu
Subject: Re: [Tinyos-help] Acknowledgments (Mohammed Biloo)

Hi Imran, 

What you could do is create a 16-bit variable that is used as a packet counter and include that as part of the structure of the data. In other words, in your header file, packet_counter would be a field of the struct. On the transmitter side, you would initialize the variable in Boot.booted to 0. In Receive.receive, you could have the following (in pseudocode):

if (received_packet_counter == Current local counter)
   if (current local counter == 2^16-1) % Just in case
      { Current local counter = 0; }
  if (current local counter != 2^16-1)
  { Current local counter ++; }
   AMSend.send (next packet)
end

On the receive side, you could send acknowledgments by updating the packet_counter field of the struct based on the data received. So, in the receivers Receive.receive, you could have:

Current local counter = Received packet counter; 
AMSend.Send acknowldgement with packet counter = Current local counter
You could differentiate between transmissions and acknowledgements by having another field in the structure called "packet_type" and set it to 1 if it's a transmission or set it to 0 if an acknowledgment, and have appropriate if statements in the Receive.receive of transmitter and receiver. 

Hope that helps, feel free to contact me if you need any more help. 

Cheers,
-- 
Mohammed Billoo
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