Re: [Ubertooth-general] it is possible to configure ubertooth to a specific range of BT channels?

[Michael M. <meh...@gm...>]

Hello Dominic,

Thank you for your replay and it took me some time before making the
changes you have suggested. I have created a new control message to apply a
channel range selection and now i can sniff the selected bluetooth channels.

However, i have noticed two things while i was reading your implementation
and it took my attention.

First, you did increment 32 channels every time you hop in sweeping mode
and i wonder why you used 32 and how can i adapt it to variable bluetooth
channel ranges.
source:
https://github.com/greatscottgadgets/ubertooth/blob/master/firmware/bluetooth_rxtx/bluetooth_rxtx.c
line 1289

Second, it is again on the sweeping mode and you switch channels 25 times
per second. Was there a good reason for this choice?
souce:
https://github.com/greatscottgadgets/ubertooth/blob/master/firmware/bluetooth_rxtx/bluetooth_rxtx.c
line 786

Regarding software defined radio, i use it often more on the energy
detection side and not for decoding technologies like bluetooth but indeed
that is an alternative and that is in my TODO list.

For the rest, thank you for your time,
Michael


On Thu, May 22, 2014 at 7:32 PM, Dominic Spill <dom...@gm...> wrote:

> On 22 May 2014 15:40, Michael Mehari <meh...@gm...> wrote:
> >
> > My problem was to assign specific ubertooth devices to a specific
> spectrum band. For example, Ubertooth dev 1 to BT_channel 1-15, . . .
> > I looked inside the sniffer source code (ubertooth-rx) and it seems it
> only has two options. Either set to a specific channel or the entire 79
> bluetooth channels?
> >
> > So my question is, it is possible to configure the ubertooth device to a
> specific range of BT channels?
>
>
> It's not possible with the current firmware, but would be possible with
> some firmware modifications.  You could add a control message that set the
> limited set of channels (or use the set_afh_map command) and then set the
> desired hopping method.
>
> I assume you're not trying to follow a connection, but are more interested
> in monitoring a section of the spectrum?  So you want to break the spectrum
> up in to six parts and use an Ubertooth in sweep mode in each?
>
> Have you also considered using a software defined radio implementation?
> You would still need multiple radio devices (such as HackRF), but it may be
> an interesting alternate angle to the problem.
>
> Thanks,
>   Dominic
>



-- 
regards,
Michael T. Mehari
GSM: +32485310659