Do you have multiple beacons?
Regardless I would try embedding in the beacon packet a unique identifier
that would
allow a clue as to if the packet being received is from the beacon you
turned off.
eric
On Wed, Jun 4, 2008 at 9:17 AM, Klaas Thoelen <[EMAIL PROTECTED]>
wrote:
> Hi *,
>
> I'm currently developing an application which involves a basestation
> sending out
> beacon messages which are to be received by free nodes. Upon reception, a
> free
> node knows that it is in range of a certain basestation and restarts a
> timer. If
> the timer fires (the interval is 2.5 times the beaconing interval), the
> node is
> considered out of range. Pretty simple, I would say.
>
> However, a fair amount of time when I switch off my basestation (and thus
> only 1
> free node is on), my free node still receives beacon messages!? Although no
> other node is on, let alone transmitting.
>
> So my question is, where do these 'ghost' messages could come from? I was
> thinking multipath, but I doubt it since it happens over an interval of
> over
> half a minute. Or some messages which are delivered to my application but
> which
> are not removed from some reception buffer and thus reappear later, but
> again I
> doubt it since this is not happening all the time...
>
> My code which handles the reception is:
>
> event message_t* AMReceiveCommandMsg.receive(message_t* msg_in, void*
> payload,
> uint8_t len) {
> if (len == sizeof(CommandMsg)) {
> CommandMsg* cmdMsg = (CommandMsg*)payload;
> if (cmdMsg->type == 2) { //this is a beaconing
> message
> connected = TRUE;
> call BeaconTimer.startPeriodic(beacon_interval);
> }
> }
> return msg_in;
> }
>
> I think this is standard as in the tutorials, so I don't see a problem
> here.
>
> I'm using TinyOS 2.0.2 on micaz.
>
> Does somebody have an idea where I can search for a solution to this?
>
> Best regards,
> Klaas
> _______________________________________________
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> Tinyos-help@millennium.berkeley.edu
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>
--
Eric B. Decker
Senior (over 50 :-) Researcher
Autonomous Systems Lab
Jack Baskin School of Engineering
UCSC
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