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4315 discussions

osmo-gsm-tester: Issue with osmo-gsm-tester-runner Jenkins job
by Callum Snowden 26 Sep '22

26 Sep '22

Hi all, We're trying to setup osmo-gsm-tester on bare metal and are currently experiencing issues with the Jenkins job 'osmo-gsm-tester-runner'. All of our test machines are running Ubuntu Server 20.04 and have been setup following the latest available manual from https://downloads.osmocom.org/docs/latest/osmo-gsm-tester-manual.pdf. We've trying to use the '4g_srsLTE' example from https://github.com/osmocom/osmo-gsm-tester/tree/master/doc/examples/4g_srsL… but when trying to run the 'ping' test the following error is returned in the Jenkins console output: " 14:07:52.867022 run mk-remote-dir(pid=2480): ERR: Terminated: ERROR {rc=1} [trial-21↪4g:srsenb-rftype@soapy↪ping.py:9↪ping.py↪srsepc_10.100.100.113↪host-jenkins@10.100.100.113↪mk-remote-dir(pid=2480)] 14:07:53.015620 run mk-remote-dir(pid=2480): stdout: | (launched: 2022-09-23_14:07:51.598612) | mkdir: cannot create directory ‘/osmo-gsm-tester-srsepc’: Permission denied " It appears that osmo-gsm-tester is trying to create the directory 'osmo-gsm-tester-srsepc' under root, which is not permitted as the Jenkins user the script runs has does not have permissions. Additionally, it looks like this path is hard-coded in the Python module https://github.com/osmocom/osmo-gsm-tester/blob/master/src/osmo_gsm_tester/… and also the same applies for srsENB https://github.com/osmocom/osmo-gsm-tester/blob/master/src/osmo_gsm_tester/… Is this the intended behaviour? Or have we missed out steps during our bare-metal setup process? I've double-checked that the main unit can SSH into the slave unit without a password so that's not the issue causing "permission denied". Best regards, Callum.

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osmo-gsm-tester: Issue with osmo-gsm-tester-runner Jenkins job
by Callum Snowden 26 Sep '22

26 Sep '22

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git infrastructure
by Neels Hofmeyr 26 Sep '22

26 Sep '22

I guess it's a bit late, but do we really need categories on gitea? The simple world I would have expected: git clone https://gitea.osmocom.org/libosmo-pfcp git clone https://gitea.osmocom.org/osmo-upf The world we live in: git clone https://gitea.osmocom.org/celullar_infarsturcure/libosmo-pfcp git clone https://gitea.osmocom.org/osmocom/osmo-upf git clone https://gerrit.osmocom.org/libosmo-dsp and works: git clone git://git.osmocom.org/osmo-upf fails: git clone https://git.osmocom.org/osmo-upf works: git clone https://git.osmocom.org/libosmo-pfcp While I'm at it: do we have a designated primary git place for Osmocom? De facto the answer seems to be: gerrit, except when it's not on gerrit. Because of the above issues, currently there is a wave of patches rolling out which edit build scripts and READMEs to change git URLs -- it feels wrong that this is necessary. It seems the topic needs some clarification, and maybe it is still possible to simplify the git structures? - remove the layer of categories from gitea? - move gitea/cellular-infrastraucute/* to gitea/osmocom/* ? - point git.osmocom.org at gitea.osmocom.org/osmocom/ ? (cgit.osmocom.org still works) - keep cgit as the primary git place, gitea as users' playgrounds? (not sure if possible or good ideas) ~N

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transceiver aborted
by msfu 24 Sep '22

24 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 20 Sep '22

20 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 14 Sep '22

14 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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two distinct SCCP sources?
by Neels Hofmeyr 29 Aug '22

29 Aug '22

I'm confused by what is happening in the pcap linked below: According to wireshark, the SCCP message seems to come from *both* PC=4 and PC=185. A column configured as sccp.calling.pc shows Point-Code 4. A column configured as "Source Address" shows Point-Code 185. Is it even possible that the in-band Calling Address differs from whatever wireshark detects as the SCCP Source Addres? Can anyone explain where the 185 is coming from? apparently not from sccp.calling.pc. The pcap and a screenshot showing the two point-codes and the column config are here: http://people.osmocom.org/neels/Eew7we0I/ Context: The original RESET message (not part of the pcap) was sent to called.pc=4, but I have SCCP routing set up to forward PC=4 to the MSC that sees itself as PC=185. I am expecting to see a RESET-ACK sent from PC=185. IIUC The 4 should have evaporated when the MSC parsed the RESET message. But apparently when answering, it takes the "called.pc" and puts it in the response as "calling.pc" (4 is nowhere in the MSC's confguration, it MUST have taken the "4" from the received SCCP message). So what I am seeing in wireshark is eerily correct: it is the MSC that has "185" in its cfg as local address sending the ACK, and it is responding to a request that was originally sent to "4", and which osmo-stp routed to "185". The response shows calling.pc=4. But how can wireshark know that it was really "185" sending, when no such information is in the SCCP layer of that message? What am I missing? if anyone knows, thanks in advance... ~N

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New repository - libosmo-gprs.git
by Vadim Yanitskiy 18 Aug '22

18 Aug '22

Hi all, as some of you may know, I am working on the MS side implementation of GPRS protocol stack. The end goal is to have something similar to srsUE (part of srsRAN, former srsLTE), but for GPRS. In order to reduce code duplication it was decided to move some stuff from both osmo-pcu.git and osmo-sgsn.git into shared libraries, so that we could re-use existing code in the upcoming MS side implementation. == What is already done * Redmine: https://osmocom.org/projects/libosmo-gprs * Gerrit: https://gerrit.osmocom.org/q/libosmo-gprs * Gitea: https://gitea.osmocom.org/osmocom/libosmo-gprs * osmo-ci.git: https://gerrit.osmocom.org/c/osmo-ci/+/29019 == What is missing * GitHub: https://github.com/osmocom/libosmo-gprs * cgit: https://cgit.osmocom.org/libosmo-gprs/ ** Coverity pulls from this mirror ** Jenkins build verification uses this mirror I will need some help with both GitHub and cgit, as I don't have admin permissions. Please also let me know if I missed something. Best regards, Vadim. -- - Vadim Yanitskiy <vyanitskiy at 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 * Geschaeftsfuehrer / Managing Director: Harald Welte

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shadysim STK installation issue
by Karsten Ohme 11 Aug '22

11 Aug '22

I tried to use shadysim (https://gitea.osmocom.org/sim-card/sim-tools) to install a STK / CAT applet on the sysmoISIM. It was not working for me, also it does not support UICC parameters and it seems that still Python 2.7 is needed. As an alternative I have added support for gpshell (https://kaoh.github.io/globalplatform/) to use SCP02 and pass the SIM/UICC parameters. See the new parameters "uiccSystemSpecParam" and "simSpecParam" for the "install" command https://github.com/kaoh/globalplatform/blob/master/gpshell/src/gpshell.1.md and inspect the https://github.com/kaoh/globalplatform/blob/master/gpshell/helloInstallSTK.… example file. If "brew" ins installed then "brew install kaoh/globalplatform/globalplatform" is sufficient for the installation. I also faced the issue that the sysmoISIM cards are only accepting SIM parameters and no UICC parameters, which is strange or even a bug since these cards are newer and are supporting the newer UICC ETSI specifications.

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