Messages will be lost. Get over it...
The number will vary depending on the distance
between motes, and whether they can all "hear"
each other (see Hidden Node Problem). I think
TOSSIM has a whole modeling system for testing
message failures, but I've never used the sim.
I also found that throttling sends with up to 10ms
between them helped greatly in small systems. See
this old report:
http://www.etantdonnes.com/Motes/report_mica2/
MS
Kartik Siddhabathula wrote:
> Hi Harshal,
>
> As from your output it is clear that the receiver mote is able to get
> the messages.
> The problem must be in the simultaneous sending. The problem I faced was
> also when I was sending simultaneously that's why I wanted to know what
> is the buffer size for receiving.
>
> As far as I my understanding goes, the reason must be that when the
> receiver receives the messages, it keeps in the buffer till it is
> processed (crc check etc). While it is processing a packet and another
> one arrives it puts them in the buffer queue.
>
> Kartik
>
> --- On *Mon, 7/19/10, harsh...@cse.iitk.ac.in
> /<harsh...@cse.iitk.ac.in>/* wrote:
>
>
> From: harsh...@cse.iitk.ac.in <harsh...@cse.iitk.ac.in>
> Subject: Re: [*] [Tinyos-help] Regarding sending and receiving
> To: "Kartik Siddhabathula" <siddhabathulakar...@yahoo.com>
> Cc: tinyos-help@millennium.berkeley.edu
> Date: Monday, July 19, 2010, 3:50 AM
>
> Hi Kartik,
> Thanks for your reply. I did what you suggested and got the
> following output:
> X=91
> X=94
> X=86
> X=90
> X=83
> X=88
> X=77
> X=86
> X=89
> X=89
>
> According to this, most packets are received, which is good. However, in
> my application I am still facing the same problem. In that app, many
> nodes
> try to send at a time to a particular node. More concretely, in (TOSSIM
> simulation of) a 25 node network, about 20 nodes send a message to a
> particular node of which only 7-8 are seen to be received by it. Could
> this simultaneous sending be a reason for that node to not to
> receive all
> the messages?
>
> Regards,
> Harshal
>
>
> > Hi Harshal,
> >
> > I got over the problem. I tested some code two days back and I
> found that
> > I was receiving some where between 89 to 99 messages out of 100
> messages.
> > I am not sure how I overcame the problem though I hadn't made
> much changes
> > to the code!
> >
> > Try to do this: Have one sender and one receiver.
> > Sender sends 1000 messages and each message is a number one more
> than the
> > previous one.
> >
> > At the receiver have two variables X and Y initialized to 0.
> > let's say the received number is z,
> > do if z<Y+100 then X++
> > else save the value of X in the log and then do X=0 and Y=Y+100.
> >
> > Get the log and then let me know the results.
> >
> > Kartik
> >
> >
> > --- On Sun, 7/18/10, harsh...@cse.iitk.ac.in
> </mc/compose?to=harsh...@cse.iitk.ac.in> <harsh...@cse.iitk.ac.in
> </mc/compose?to=harsh...@cse.iitk.ac.in>>
> > wrote:
> >
> > From: harsh...@cse.iitk.ac.in
> </mc/compose?to=harsh...@cse.iitk.ac.in> <harsh...@cse.iitk.ac.in
> </mc/compose?to=harsh...@cse.iitk.ac.in>>
> > Subject: Re: [*] [Tinyos-help] Regarding sending and receiving
> > To: "Kartik Siddhabathula" <siddhabathulakar...@yahoo.com
> </mc/compose?to=siddhabathulakar...@yahoo.com>>
> > Cc: tinyos-help@millennium.berkeley.edu
> </mc/compose?to=tinyos-h...@millennium.berkeley.edu>
> > Date: Sunday, July 18, 2010, 11:46 PM
> >
> >> Hi All,
> >>
> >> I have a question regarding the buffers. I am using tinyos-2.x and
> > telosb
> >> motes. From one mote I sent a message 100 times, but another
> mote which
> > was configured to receive the messages received less messages.
> >>
> >> Once it received the message only thrice and the maximum is 57
> messages.
> > The no of messages received (on average) is 30.
> >>
> >> What could be the reason, any ideas?
> >>
> >> Thanks in advance,
> >> Kartik
> >>
> >>
> >>
> >> _______________________________________________
> >
> >
> > Hi,
> > I am facing a similar problem to the one above. It would be
> really great
> > if someone provides some pointers.
> >
> > Regards,
> > Harshal
> >
> >
> >
> >
> >
> >
>
>
>
>
> ------------------------------------------------------------------------
>
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