Am 14.03.2013 um 00:27 schrieb Sascha Herrmann <sas...@ps.nvbi.de>:
>>>> Ack support is something that's been on my radar to add, but haven't had
>
>>>> time. Maybe you have time to do this properly, by making a new netlink
>>>> item to turn acking on and off and pushing it through iz.
>>> I would like to see ACK support, too. But I think, it should implemented
>>> in the mac layer too, for situations where auto ack isn't an option.
>>
>> I'm not sure it can be implemented in software, due to the non-realtime
>> nature of the Linux kernel. The mrf24j40 datasheet hints at it almost
>> being a requirement to be done in hardware because of the timing
>
>> requirements of the 802.15.4 standard.
>
> Yes, I think you are right. I didn't realize that the ack frames are
> send with such a tight timing and without csma/ca. Ack frames are
> required to be send within 12 symbol periods (192us for 2,4GHz).
I absolutely second that. ACK timing is way too tight on Linux. You can do it
on Contiki with a dual-buffer radio such as the CC2420:
http://www.ibr.cs.tu-bs.de/papers/poettner-wisarnfall2011.pdf
Bastian
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