Re: [Grailrtls-developers] wifi card

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Hello Giuseppe,

The GRAIL platfom itself is agnostic to the hardware that is being used to
collect data so long as you can get some basic statistics, like signal
strength, from the system. Once you get the RSSI values you can send them
into the system and the RSS algorithms, such as localization and mobility
detection, will operate as expected without caring about what hardware is
providing the data.

To capture data we use libpcap with radiotap. Libpcap allows us to see
wifi packets and radiotap adds some additional information (such as RSSI)
into the packet headers. Read the radiotap page for more information on
that: http://www.radiotap.org/

We've written interfaces to the GRAIL system in Java, C++, and Ruby so you
could either try to get the code in
grailrtls/grail-solvers/src/wifi_sense_layer.cpp to work with your card or
you could try to write a small program, for instance with RubyPcap
(http://sourceforge.net/projects/rubypcap/) in Ruby or JNetPCap
(http://jnetpcap.com/) in Java. A C++ program would use the C interface to
libpcap as in our wifi_sense_layer program. I wasn't the person who
originally wrote this code, but if you get the RSS values I can help you
with the rest of the GRAIL system.

-Ben Firner

> We are working on the feasibility of a network of environmental sensors in
> collaboration with the Earth Sciences Department of Bologna University
> (Italy).
> Probably we'll have to face the use of embedded pc without Atheros
> chipset, so we have a few questions:
> Is it possible to configure and use GRAIL for access to wifi cards other
> than atheros compatible?
> It is for some time that MADWIFI is no longer available on repository for
> latest release of Ubuntu.
> Is it still needed to support the setup of wireless networks, or can we
> use other tools?
>
> Best Regards
> Giuseppe Onorevoli
>
>
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