Hi all Found a solution for solving this issue. You should either define the RF230_HARDWARE_ACK flag in both the Makefiles of UDPEcho and IPBaseStation or the SOFTWAREACK_TIMEOUT flag and set it to minimum value of 900.
CFLAGS += -DSOFTWAREACK_TIMEOUT=900 Although the predefined value for SOFTWAREACK_TIMEOUT in Rf230RadioP is 1000 the UDPEcho works properly only with the above mentioned adjustments. Best Regards Zsolt 2010/9/15 Miklos Maroti <[email protected]> > Hi Stephen, > > I think the stack never duplicates data packets. Do you mean that if > an ack packet does not arrive on time, then BLIP will retry, which on > a MAC level is a new message, but on the BLIP level it is a duplcate > UDPEcho packet? > > Zsolt and Krisztian, can you increase the SOFTWAREACK_TIMEOUT to 2000 > and see if that improves the situation? (By the way, on our tests we > saw only 1-2% duplicate packets on IRIS). > > Best, > Miklos > > On Wed, Sep 15, 2010 at 5:37 PM, Stephen Dawson-Haggerty > <[email protected]> wrote: > > I believe this is an issue with the iris radio stack when using > > software acks? I remember that its ack timeout was set to be shorter > > than the software turnaround time on an epic platform. However, I'm > > not an iris expert... > > > > Steve > > > > On Mon, Sep 6, 2010 at 10:16 PM, nithin k n <[email protected]> > wrote: > >> > >> hi there > >> > >> UDPEcho is not behaving well, for eg, while pinging the UDPEcho > installed > >> motes, the basestation gets too many DUP! packets in reply, > >> on an average, the count of DUP! packets is more than actual ping reply > >> packets. > >> Reason for this? > >> > >> Regards, > >> Nithin > >> > >> > >> _______________________________________________ > >> Tinyos-help mailing list > >> [email protected] > >> > https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help > >> > > > > > > > > -- > > stephen dawson-haggerty > > http://cs.berkeley.edu/~stevedh <http://cs.berkeley.edu/%7Estevedh> > > uc berkeley wireless and embedded systems lab > > berkeley, ca 94720 > > _______________________________________________ > > Tinyos-help mailing list > > [email protected] > > https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help > > >
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