OpenBSC

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Question regarding timeouts and RRLP
by Refik Hadzialic 24 Apr '12

24 Apr '12

Dear group members, (I would like to apologize if you got this message for the second time, but last time I sent it to the wrong mail address and I am not sure if the gnumonks mailing list is synchronized with this one, osmocom, I am sorry if you get this mail for the second time!) I would like to ask you a question regarding the timeouts and initiating/allocating an SDCCH channel for a subscriber inside of the GSM network. I am trying to modify some parts of OpenBSC (/openbsc/src/libmsc/rrlp.c) and to implement the MS-based RRLP in OpenBSC (to send assistance data in form of almanac, ephemeris, BTS geolocation data and GPS reference time to the MS). At the moment I use the silent sms to start an RRLP request (send RRLP request + assistance data and then send the silent sms). But if it takes too long to send the assistance data OpenBSC starts from the beginning (send rrlp request + assistance data + sms again). I think this is because OpenBSC waits for an ack from the MS for the silent sms (which has not been sent) and therefore it's a timeout issue. As a quick hack I have modified parts of the code and got the RRLP to work (sent successfully these data and I got a position from the MS). Just for the curious one, I commented out three lines just before the return, in /openbsc/src/libmsc/gsm_04_11.c in the function, gsm411_rx_rp_ack, the following lines: //else //gsm411_release_conn(trans->conn); /* free the transaction here */ //trans_free(trans); and I changed one timer value from 10 to 100, in /openbsc/src/libbsc/bsc_rll.c in the function, rll_establish to: osmo_timer_schedule(&rllr->timer, 100, 0);. As I know what I did was wrong (since changing the timers and not releasing the channel properly influences the whole system) but I just did it for the purpose of testing and to see do I send correct data and does the RRLP work at all. I hope you can give me some hints and guides how to allocate a channel for around 130 seconds and to send the RRLP assistance data within that channel without doing the above tricks. Once everything works properly I will provide the RRLP code. Best regards, Refik Hadzialic

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Re: Buying a nanoBTS
by Alex J Lennon 04 Apr '12

04 Apr '12

Hi Patrick, They come up on eBay now and again. You might want to keep an eye on there. I paid around £150. I'm not sure if that's good or bad... Best Regards, Alex On 04/04/2012 10:22, Patrick Klapper wrote: > Hello, > > I am interested in buying a nanoBTS. > The sales department of ip.access told me, that they only sell their products to mobile operators. > > Where can I buy an ip.access nanoBTS (GSM1800) and what's its price? > > Regards > > Patrick

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April 11, 7pm / Re: Regular Osmocom meeting in Berlin?
by Harald Welte 04 Apr '12

04 Apr '12

To quote myself... On Fri, Mar 30, 2012 at 12:00:42PM +0200, Harald Welte wrote: > > I would probably be in favor of Wednesday > > Great, then we have already three people in favor of Wednesday (which > would also work out fine for me). I've now inquired with CCC Berlin, people there seem to be fine with a bi-weekly meeting on wednesday. I told them that one CCCB member would be present at every meeting. This would likely be me (unless I'm travelling) so we have to see that somebody else (dexter, prom, roh, zecke, ...) can fulfill that role during other meetings. The first meeting thus will be next wednesday, April 11. I suggest we meet at 7pm. A more official announcement will follow. -- - Harald Welte <laforge(a)gnumonks.org> http://laforge.gnumonks.org/ ============================================================================ "Privacy in residential applications is a desirable marketing option." (ETSI EN 300 175-7 Ch. A6)

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Re: Recording / Re: Regular Osmocom meeting in Berlin?
by Katrin Verclas 01 Apr '12

01 Apr '12

It was my understanding from your suggestion that there would be presentations and discussions after those presentations at the meetings, making this not just having a beer with friends but more formal affairs. That would be useful for people elsewhere to see, given that this is a global community. Not sure what German law has to do with putting online or streaming such presentations. Cameras off when it comes to the informal part and beer time.. Love this list otherwise. And will come to Berlin this summer so may attend one or two, regardless :) Cheers from New York. K ------Original Message------ From: Harald Welte To: Katrin Verclas Cc: Holger Hans Peter Freyther Cc: Akib Sayyed Cc: baseband-devel(a)lists.osmocom.org Cc: openbsc(a)lists.osmocom.org Subject: Recording / Re: Regular Osmocom meeting in Berlin? Sent: Mar 31, 2012 8:01 AM Hi Katrin, On Fri, Mar 30, 2012 at 07:17:17PM +0000, Katrin Verclas wrote: > Could not disagree more. We live-stream local events all the time with > a very unobtrusive webcam/ustream and it bothers no one who is there > but benefits all who are not. And I couldn't disagree more with you. The mere existance of the two words 'camera' and 'unobtrusive' in one sentence are a contradiction in terms. If I want to meet with a small group of people and informally discuss technical topic, than that is _very_ different from being live streamed to an unknonwn number of people, any of which could make recordings and I would have to very carefully think about each and every word that I'm saying. That's not a particularly relaxed environment and would kill all the fun there is in having the meeting in the first place. Legally, In Germany this corresponds to "not publicly spoken word" (nicht oeffentlich gesprochenes Wort). It is punishable under law to record or broadcast that. (Clause 201 of German criminal code). Regards, Harald -- - Harald Welte <laforge(a)gnumonks.org> http://laforge.gnumonks.org/ ============================================================================ "Privacy in residential applications is a desirable marketing option." (ETSI EN 300 175-7 Ch. A6) Sent via mobile. Hence, short.

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Re: Regular Osmocom meeting in Berlin?
by Katrin Verclas 31 Mar '12

31 Mar '12

Could not disagree more. We live-stream local events all the time with a very unobtrusive webcam/ustream and it bothers no one who is there but benefits all who are not. Best, Katrin ------Original Message------ From: Holger Hans Peter Freyther Sender: baseband-devel-bounces(a)lists.osmocom.org To: Akib Sayyed Cc: baseband-devel(a)lists.osmocom.org Cc: openbsc(a)lists.osmocom.org Subject: Re: Regular Osmocom meeting in Berlin? Sent: Mar 30, 2012 3:13 PM On 03/30/2012 07:27 PM, Akib Sayyed wrote: > even i am in.people who cannot participate please make some > arrangement for them like live streaming and chat support. > <http://www.ustream.tv/ support free live streaming> Hi, I don't think this is a good idea. It kills the local atmosphere without having any real benefit. Every decision/code and most likely slides will be public anyway. z. Sent via mobile. Hence, short.

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Regular Osmocom meeting in Berlin?
by Harald Welte 31 Mar '12

31 Mar '12

Hi all, I was pondering to start a regular Osmocom meeting (monthly or bi-weekly) in Berlin. The idea would be not only to converge the existing developers in Berlin (zecke, roh, prom, tobias, peter, kevin, myself, ...) but to also try to share some knowledge and excitement with other interested hackers in the wider community. A split format for the event might make sense: Have a more or less organized 45min talk about one particular topic + 15min discussion and then switch to an informal meeting style without any particular topic or moderator. For the first half there is a long list of topics intended at informing people about the status and capabilities of the respective projects: OsmocomBB, OsmoTETRA, OsmoGMR, SIMtrace, etc. Regarding the venue, I would suggest to hold it at the Berlin CCC. What do you generally think about this? What day of the week should we be aiming at? Tuesday and Thursday is generally not a good idea, as those are already occupied with other events. If you think it's a good idea, I would request/register the event with the CCC Berlin. Regards, Harald -- - Harald Welte <laforge(a)gnumonks.org> http://laforge.gnumonks.org/ ============================================================================ "Privacy in residential applications is a desirable marketing option." (ETSI EN 300 175-7 Ch. A6)

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Re: Regular Osmocom meeting in Berlin?
by Zsombor 30 Mar '12

30 Mar '12

Can you record the video about the presentations and upload to some video sharing site ? I'm certain, that there would be some interest watching it :) Thanks, Zsombor On 2012.03.30. 13:33, "Tobias Engel" <t-openbsc(a)tobias.org> wrote: On 29.03.2012 21:41, Peter Stuge wrote: > Harald Welte wrote: >> I was pondering to start a regular ... I would say monthly is more realistic. But I'm also fine with bi-weekly. >> What day of the week should we be aiming at? > > I like Wednesday. Me too. -Tobias

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Call for participation LSM/RMLL
by Mathias Coinchon 30 Mar '12

30 Mar '12

Dear Osmocom community, This email to inform you that the call for participation for the next Libre Software Meeting (LSM or RMLL: Rencontres Mondiales du Logiciel Libre) ends on 31st March: http://2012.rmll.info/en/participate/call-for-papers This edition will take place in Geneva from 7th to 12th July 2012 (7-8 general public days, 9-12 theme focused, professional). It would be of great interest for the communities to learn about the Osmocom projects in presentations or workshop. Real world applications would be interesting too. So please don't hesitate to directly submit. Don't hesitate also to contact me for more information. Mathias Coinchon

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Question regarding timeouts and RRLP
by Refik Hadzialic 29 Mar '12

29 Mar '12

Dear group members, I would like to ask you a question regarding the timeouts and initiating/allocating an SDCCH channel for a subscriber inside of the GSM network. I am trying to modify some parts of OpenBSC (/openbsc/src/libmsc/rrlp.c) and to implement the MS-based RRLP in OpenBSC (to send assistance data in form of almanac, ephemeris, BTS geolocation data and GPS reference time to the MS). At the moment I use the silent sms to start an RRLP request (send RRLP request + assistance data and then send the silent sms). But if it takes too long to send the assistance data OpenBSC starts from the beginning (send rrlp request + assistance data + sms again). I think this is because OpenBSC waits for an ack from the MS for the silent sms (which has not been sent) and therefore it's a timeout issue. As a quick hack I have modified parts of the code and got the RRLP to work (sent successfully these data and I got a position from the MS). Just for the curious one, I commented out three lines just before the return, in /openbsc/src/libmsc/gsm_04_11.c in the function, gsm411_rx_rp_ack, the following lines: //else //gsm411_release_conn(trans->conn); /* free the transaction here */ //trans_free(trans); and I changed one timer value from 10 to 100, in /openbsc/src/libbsc/bsc_rll.c in the function, rll_establish to: osmo_timer_schedule(&rllr->timer, 100, 0);. As I know what I did was wrong (since changing the timers and not releasing the channel properly influences the whole system) but I just did it for the purpose of testing and to see do I send correct data and does the RRLP work at all. I hope you can give me some hints and guides how to allocate a channel for around 130 seconds and to send the RRLP assistance data within that channel without doing the above tricks. Once everything works properly I will provide the RRLP code. Best regards, Refik Hadzialic

1 0

Generate html with coverage info for osmocom
by Holger Hans Peter Freyther 26 Mar '12

26 Mar '12

Hi All, I wrote this very simple script to build a bit of osmocom with coverage info, run the tests and use the lcov utility to create html. I am too lazy to upload the result somewhere right now. holger

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