Hello, In a multihop scenario the same packet may reach the destination following different routes originating duplicate packets. In this case in particular I am trying to figure out how to deal with duplicates in routing nodes (not in end nodes of communication) and how to avoid infinite cycles where a message keeps on being forwarded. Chrs,
João -----Original Message----- From: Arik Sapojnik [mailto:sapoj...@gmail.com] Sent: Mon 1/18/2010 4:54 PM To: jcarneiro Cc: tinyos-help@millennium.berkeley.edu Subject: Re: [Tinyos-help] Packet tracking and duplicates Hi, Perhaps you should consider a sliding window mechanism, TCP style. BTW - how can you receive duplicate packets? The only reason I see - it can happen when the sender didn't receive the ack, although the receiver did send it. In this case, the sender will send the again the same packet. In this scenario - you need only the previous packet number. Arik On Mon, Jan 18, 2010 at 11:48, jcarneiro <jcarne...@netcabo.pt> wrote: > Hello all, > > To prevent duplicate packets you would look at the origin and sequence > number. > This would then assume that you maintain a list of packets from every > origin meaning probably memory problems, and possibly speed inserting > new/checking duplicates. > My question is what data structure are you using to store this? I would > assume a hash but I guess that's huge for the microchip. And how many > packets do you store per origin as they may be delivered in a different > order? > Thanks in advance! > > Joao > > _______________________________________________ > Tinyos-help mailing list > Tinyos-help@millennium.berkeley.edu > https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help > -- Best Regards, Arik Sapojnik sapoj...@gmail.com
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