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

Baptiste Clenet bapclenet at gmail.com
Tue Jan 30 13:31:05 CET 2018


How does CSMA work on at86rf2xx driver?
Is error handled?

Cheers,

2018-01-29 20:26 GMT+01:00 Baptiste Clenet <bapclenet at gmail.com>:
> 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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>> devel at riot-os.org
>> https://lists.riot-os.org/mailman/listinfo/devel
>
>
>
> --
> Baptiste



-- 
Baptiste


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