[riot-devel] Re-transmission, interval 40ms problem

Peter Kietzmann peter.kietzmann at haw-hamburg.de
Mon Jan 29 10:30:15 CET 2018

Hi Baptise,

which software did you use on BOARD A and B? AFAIK there is not a known
problem with this in the stack. The Atmel radio does automatic
retransmission and carrier sensing which might take some milli seconds
(not 40!). Can you check if the 802.15.4 sequence number of these
packets is equal?


Am 26.01.2018 um 10:48 schrieb Baptiste Clenet:
> Hi,
> Some packet are lost while sending message between two samr21 so I use
> the sniffer application to check paquet over the air.
> I was surprised to see that sometime paquet are retransmitted without
> my consent!
> I mean:
> I send one paquet from BOARD A to BOARD B
> BOARD B does not receive it
> BOARD C (sniffer) sees two paquets with 40ms interval
> The interval is almost 40ms every time there is a paquet retransmission.
> Do you know why paquet is retransmitted 40ms after the first one?
> Is this a problem (or normal behaviour) in RIOT stack or transceiver?
> Cheers,

Peter Kietzmann

Hamburg University of Applied Sciences
Dept. Informatik, Internet Technologies Group
Berliner Tor 7, 20099 Hamburg, Germany
Fon: +49-40-42875-8426
Web: http://www.haw-hamburg.de/inet

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