Hey Stefan,

Thanks for checking in, I hope the CCCamp goes well.

After some more surveying of the osmocom-bb codebase, I don't think I'm seeing any support yet for LAPDm multiframe mode. According to Wikipedia this is a necessary step to exchange SMS data (correct me if I'm wrong here, I just started really learning SMS last week). I've started implementing this in osmocom-bb/src/host/layer23/src/mobile/gsm48_mm.c as a first step.

I did a quick look around the openbsc codebase. There appears to be some code there relating to SMS TP-DU forming and parsing, and the rest looks like it would require some refactoring to split. I'm not sure how much refactoring is worth it, but at least for the TP-DU code, would you want that relocated to libosmocore if I wanted to reuse it?

I'll post up a patch when I get something decent. What's (is there a?) the preferred test method for layer23 code? Understandable that you're having some trouble getting input from people.

Andrew

On Thu, Aug 11, 2011 at 4:34 AM, Stefan Schmidt stefan@datenfreihafen.orgwrote:

Hello.

I skim in here as most developers are really busy with the GSM network setup at the CCCamp at the moment.

On Wed, 2011-08-10 at 13:41, Andrew Reusch wrote:

...

I work in a research lab and we're interested in using your stack to send SMS. I've got some time on my hands and a working OpenBTS stack (USRP),

so I

...

will probably go ahead and start implementing it in the mobile app.

Before I

...

start I just wanted to ask first about the status of mobile-originated

SMS?

...

I saw some traffic in the archives a few months back from Gianni about mobile-terminated SMS, but nothing recent about mobile-originated SMS.

Jolly or Sylvain will maybe know better but I think there is no SMS functionality at all in osmocom bb right now. What we have though is the SMS code on the networking side in OpenBSC. This could be used as base for sharing this between osmocom.bb and OpenBSC.

...

Barring that, any suggestions on where to start? :) I'm kinda new here.

You should have a look at libosmocore and the openbsc codebase first to figure out what parts of SMS functionality is there first.

...

Assuming I get something solid working, I'd of course be willing to contribute it back to the codebase.

This would at least give you some support here. We had some problems with supporting people without getting anything back. Be it docs, useful bug reports or actual code. :/

Anyway a putting up a public repo with your code will show other people what you have and perhaps help you debug it.

regards Stefan Schmidt

Oh whoops, thanks! I didn't look over common/ too well apparently.

On Thu, Aug 11, 2011 at 4:00 PM, Harald Welte laforge@gnumonks.org wrote:

lapdm multiframe (abm) mode is implemented in the osmocom lapdm code, no need to reimplement it ! -- Sent from a mobile device, excuse my short response