On May 10, 2007, at 3:09 PM, Vikram Kaul wrote:
>>>> I am looking at connex-400xm/wifistix combination and wanted to
>>>> of any potential pitfalls. Can someone please answer the following
>>>> questions ?
>>>> - Can the setup be powered by standard off-the-shelf battery
>>>> pack ?
>>> I guess it depends on your definition of standard off the shelf
>>> battery pack. You can power the gumstix using 3 AA cells.
>> 3 AAs might not last if you're running wifi. You might want to bring
>> up/shut down the wifi link if you don't need it always on. You might
>> also want to look at doing multiple of 3 AAs in parallel.
> My target application of this setup is wireless ad-hoc networking
> the connex/wifistix node will act as a relay device. Hence, I will
> to keep it up all the time. I am not sure how long.. but I would say 3
> or 4 hours at least. I was looking at finding out if the transmit
> of the wifistix could be reduced. That would mean more relays, but at
> least they would last longer.
The radio power can be reduced easily, using the "txpower" option to
iwconfig. There are also some power control features accessible
through iwpriv which can be set too. I can dig up some bits of
documentation on those...
> Also, is the wifi driver open-source ?
Well, hard to say. Marvell told us yes, we signed a licensing
agreement with them which said yes. We then posted the code, and
some of their lawyers told us that it wasn't open source. So in any
case, the effective answer for now is "no" since we can't give it to
you and you won't be able to find it elsewhere (though much of the
code is published in the OLPC kernel tree). If you ask me questions
about it though, I have the code and can answer probably most of what
you need to know.