OpenBSC September 2022

openbsc@lists.osmocom.org

10 participants
24 discussions

25 Sep '22

hi there, i ran into an error with ./transceiver in osmocom-bb if i write osmocom/osmocom-bb/src/host/layer23/src/transceiver # sudo ./transceiver -a 47 -2 -r 99 the cli returns with 47 41 1 Aborted what am i doing wrong? i hope you can help me out. have a nice day msfu

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Ideas/proposals for Osmocom project submissions to NLnet or prototypefund?
by Harald Welte 21 Sep '22

21 Sep '22

Dear Osmocom community, during the past years, we've been applying for (and often receiving) grants for the development of certain parts of the Osmocom project. There are two organizations (NLnet foundation and the German prototype fund) where the next call for proposals ends in 10 days from now. So if any of you has some ideas about Osmocom related work that you would want to see implemented and for which you can argue that it fits the scope of the related funds, please feel free to bring them up here. For NLnet, the scope should fit either * https://nlnet.nl/entrust/ * https://nlnet.nl/useroperated/ For prototype fund, the scope should fit https://prototypefund.de/jetzt-bewerben-fuer-runde-13/ - specifically I think it is likely that we could fit a number of "our" topics in https://prototypefund.de/softwareinfrastruktur/ which explicitly lists implementation of communication protocols. Given that I have plenty of experience with both funds, I'd be willing to work on a concrete proposal and submit it before the deadline on Sept 30 / Oct 1. In terms of "who would do the actual work": With NLnet projects we can involve freelancers across Europe, with prototype fund probably only in Germany. In the worst case, if you propose some idea but have no time to work on such a project yourself, or you are not eligible due to the restriction to EU/DE, sysmocom could carry out the implementation. Let me know if anyone of you has some ideas as to what kind of osmocom related topics might be suitable candidates. Thanks, Harald -- - Harald Welte <laforge(a)osmocom.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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mscgen
by Neels Hofmeyr 15 Sep '22

15 Sep '22

RFC about mscgen mscgen is our tool of choice to generate ladder diagrams from the "msc" text input format. We use it in user manuals and on our redmine wiki, and there are also various .msc files in doc/ subdirs, as assistance for development. I've written a lot of ladder diagrams, for documentation as well as figuring out how to implement things. I've developed a love/hate relationship, and recently I found a bug in mscgen. Things have come up that I'd like your opinion on: * ladder_to_msc.py Writing .msc files by hand quickly started to annoy me: - Having to write '[label="..."]' all the time. - Multiline labels (e.g. '(note)' block) require "foo\nbar\nbaz" - input symbols for arrows are weird / non-intuitive - cannot use 'msc' as entity, weirdly conflicts with the outer 'msc { ... }', which is annoying for GSM diagrams featuring an MSC. So quite some while ago I wrote a python script that reads my personal favorite format in which i enjoy writing ladder diagrams, and outputs plain .msc file format. I put it in libosmocore/contrib/ on a branch, have been using it ever since, but i never submitted it for merging, because it seemed like a personal preference thing, not worth complicating the doc tool chain for. So far I was, if at all, committing only the resulting .msc to git. But that creates a situation where only I have the *original* source in .ladder format, so (hypothetically) collaborating on ladder diagrams becomes convoluted. Here is an example of my favorite ".ladder" format: ------ {hscale=1} upf = User Plane function cpf = Control Plane function upf <- cpf PFCP Association Setup Request CP function Node Id, features upf -> cpf PFCP Association Setup Response UP function Node Id, features upf <> cpf associated upf () cpf start Heartbeat checking ... ------ The equivalent .msc produced by ladder_to_msc.py: ------ msc { hscale="1"; upf[label="User Plane function"],cpf[label="Control Plane function"]; upf <= cpf [label="PFCP Association Setup Request\nCP function Node Id, features"]; upf => cpf [label="PFCP Association Setup Response\nUP function Node Id, features"]; upf abox cpf [label="associated"]; upf rbox cpf [label="start Heartbeat checking"]; ...; ------ I'd like to hear some opinions, if you have any, on whether anyone else likes my new ladder format, and how to deal with .ladder source files. Would it make sense to merge ladder_to_msc.py to libosmocore, install it via 'make install', and add the original .ladder files as well as Makefile rules to convert .ladder to .msc to .png where ever i wrote .ladder diagrams? * mscgen bitrot is likely Recently I've found a segfault in mscgen. I found a fix and tried to submit it. That's when I discovered that: - the original project on code.google.com is dead and gone - the mail addresses of the original author result in bounces - random people put mscgen's trunk on github, exported from google code, no activity is apparent I did reach the Debian maintainer of mscgen by mail. He doesn't have any way to contact the original author, either. It seems there could be a patch in the Debian package, at best. I wonder if it would make sense to officially create an mscgen "fork" on Osmocom, in an effort to save the tool from bitrot and extinction, and offer our mscgen as the new upstream for debian's mscgen packaging. I do have a number of things i'd like mscgen to be able to do, like left-adjust text in "note" blocks or improve the resolution of produced PNG images; I might also implement support for my .ladder format directly in mscgen. I am vague on what my opinion is between the advantages and disadvantages, and it's all only semi important. I just know that I always end up writing .ladder instead of .msc, and that we will always need ladder diagrams. Do you have any opinions on these things? Thanks! pointers: ladder_to_msc.py: libosmocore branch neels/ladder https://cgit.osmocom.org/libosmocore/commit/?h=neels/ladder&id=073ad74435ec… My most recent ladder chart: https://cgit.osmocom.org/osmo-bsc/commit/?h=neels/codec&id=01f370c1b365305f… -- - Neels Hofmeyr <nhofmeyr(a)sysmocom.de> http://www.sysmocom.de/ ======================================================================= * sysmocom - systems for mobile communications GmbH * Alt-Moabit 93 * 10559 Berlin, Germany * Sitz / Registered office: Berlin, HRB 134158 B * Geschäftsführer / Managing Directors: Harald Welte

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Osmocom GUI support
by Ahnaf Tahmid 02 Sep '22

02 Sep '22

Dear OpenBSC team, I am Ahnaf Tahmid Chowdhury, currently building Osmocom graphical user interface. I have created a subscriber page where one can add/remove/update subscriber. The repo is available at: https://github.com/ahnaf-tahmid-chowdhury/osmo-gui Please let me know your thoughts about the application. Thank you

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OpenBSC September 2022