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

[Baptiste Clenet]

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

Cheers,

2018-01-29 20:26 GMT+01:00 Baptiste Clenet :
> 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 :
>> 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
>> ___
>> devel mailing list
>> devel@riot-os.org
>> https://lists.riot-os.org/mailman/listinfo/devel
>
>
>
> --
> Baptiste



-- 
Baptiste
___
devel mailing list
devel@riot-os.org
https://lists.riot-os.org/mailman/listinfo/devel

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

[Baptiste Clenet]

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 :
> 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
> ___
> devel mailing list
> devel@riot-os.org
> https://lists.riot-os.org/mailman/listinfo/devel



-- 
Baptiste
___
devel mailing list
devel@riot-os.org
https://lists.riot-os.org/mailman/listinfo/devel

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

[Peter Kietzmann]

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
___
devel mailing list
devel@riot-os.org
https://lists.riot-os.org/mailman/listinfo/devel

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

[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,

-- 
Baptiste
___
devel mailing list
devel@riot-os.org
https://lists.riot-os.org/mailman/listinfo/devel