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

Baptiste Clenet bapclenet at gmail.com
Mon Jan 29 20:26:56 CET 2018


Application is based on gnrc_networking.

> Can you check if the 802.15.4 sequence number of thesepackets is equal?

Yes there are equal.
Do you know how long automatic retransmission takes for atmel transceiver?


2018-01-29 10:30 GMT+01:00 Peter Kietzmann <peter.kietzmann at haw-hamburg.de>:
> 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?
>
> Cheers
> Peter
>
>
> 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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-- 
Baptiste


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