Testing protocol stack with OsmocomBB (cheap way)

Gianni Tedesco gianni at scaramanga.co.uk
Thu Jun 2 07:41:13 UTC 2011


On Tue, 2011-05-31 at 00:31 +0200, Drasko DRASKOVIC wrote:
> On Tue, May 31, 2011 at 12:18 AM, Gianni Tedesco
> <gianni at scaramanga.co.uk> wrote:
> > On Tue, 2011-05-31 at 00:05 +0200, Drasko DRASKOVIC wrote:
> >> Hi Gianni,
> >> after few hours of searching through the wiki pages, I have not been
> >> able to find the document you were mentioning that would explain
> >> attaching to cell and have some packet transfered through protocol
> >> stack up to the Wireshark.
> >>
> >> Are you sure that this document still exist and not have been removed/replaced ?
> >>
> >> All I have found that can resemble is this :
> >> http://bb.osmocom.org/trac/wiki/layer23
> >> but I guess that this is not what you are talking about, as it gives
> >> no detailed instructions for the things I want to obtain (i.e. which
> >> applications to start, in which order, what are things to observe,
> >> etc...).
> >
> > Pretty much, but also look at the page for your specific phone model and
> > http://bb.osmocom.org/trac/wiki/osmocon
> >
> > Basically you just need to use osmocon to load the layer1 firmware,
> > power the phone up and then if 'mobile' (or whatever app you want) is
> > running, it should be "all systems go". You can run
> > mobile/cell_log/whatever before or after booting the phone and it'll be
> > fine.
> >
> >> I tried some basic test by watching OsocomBB video presentations, as
> >> these are closest instructions and recepies on tools usage I have
> >> found to get one up and running, and I described troubles I have been
> >> facing in previous mail - I tried to guess what can be the right
> >> scenario as I find no docs, but I am still not able to synchronize to
> >> any cell, nor have some packets coming...
> >
> > It's not a complicated scenario and is well explained on the wiki:
> >
> > We have a firmware for the phone that we compiled on the PC
> >
> > We have a data cable between phone and PC
> >
> > The firmware does low level things
> >
> > Other apps running on the PC do high level things (eg. mobile phone)
> >
> > We use a loader program (osmocon) to load the firmware from the PC on to
> > the phone via the cable.
> >
> > After the firmware is running on the phone, we can run high level apps
> > on the PC (mobile, cell_log, etc).
> >
> > The high level apps communicate to the phone via the communication
> > channel setup by the loader.
> >
> > Most (all?) of the high level apps have a command line switch which
> > tells them to transmit GSMTAP logs to a specific IP address.
> >
> > You can use tcpdump to capture the GSMTAP info and view it in wireshark.
> 
> Yes, thanks. I gotten that. What I meant is more like some
> instructions how to get the system running, this what I am trying to
> achieve. Now, as you can see there is a lot of information spread all
> around and I have hard time to get them together in a meaningful
> picture.
> 
> What troubles me the most is these kind of information that are
> missing, for example :
> - start this application first, then this one

Actually, either way round should be fine.

> - LOST message is OK

Hmm, maybe this one is scary but there's a LOT of different messages.

> - there is no SIM simulated, and you can not do anything without SIM,
> which is not supported on the master

True

> - connect this to this to get logs in Wireshark

Well OK, but if you've used tcpdump, wireshark etc. this is no big deal

> - etc...

I think we've covered it tbh

> Some kind of a tutorial that would prevent every starter to get stuck.

Ask Harald for wiki access and go for it.

> Thanks for your help, things are beginning to be clearer.

nps

Gianni





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