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162 discussions

Chaosradio Express #183 on TETRA
by Harald Welte 25 Jun '11

25 Jun '11

Hi all, The latest Chaosradio Express (CRE) episode has just been released, and it is about trunked radio, TETRA, security aspects and the Osmocom TETRA project. http://chaosradio.ccc.de/cre183.html (and yes, it's German, like all CRE episodes...) -- - 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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experience with fcdp
by Harald Welte 04 Jun '11

04 Jun '11

Hi! I've borrowed a Funcube Dongle Pro and tried to use it with osmocom-tetra. I've manually tuned it to a tetra carrier using the Qt-GUI, and it I can see the carrier very clearly in the spectrum/fft. However, I'm getting many more bit errors than with a USRP2+WBX board. Also, I have the feeling that the WBX has a much higher sensitivity, even with the FCDP input LNA at 30dB maxed out. Can anyone confirm these findings? I'll do some more investigation and report back here. 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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UHD based demod script
by Clemens Hopfer 04 Jun '11

04 Jun '11

Hi, I've modified the usrp2 script to use the UHD gnuradio driver for new USRP (UHD-only) hardware. It seems to work with my N200+WBX setup, but gnuradio is pretty new to me, so there might be some bugs. Since I'm using the WBX my antenna port is 'TX/RX'. I'm not sure if this is a good default value, it's configurable though. Clemens Hopfer

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Fun Cube Dongle Pro internals
by Harald Welte 03 Jun '11

03 Jun '11

Hi! For those interested, I've taken apart the case and did some investigation how the FCDP hardware architecture looks like. The results are available at http://tetra.osmocom.org/trac/wiki/Funcube_Dongle It seems the silicon tuner actually is intended for DVB-T, thus the bandwidth it can down-convert is _much_ higher. However, the audio codec that they use can only do 96kHz. That's actually really sad. I wish they had used something with higher ADC rate. But it seems like even high-end audio codecs never get you beyond 196/216 kHz - still insufficient for e.g. GSM. 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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Suche Informationen zu Funcube und dem py Script
by Markus Zielonka 25 May '11

25 May '11

Hallo Tetra Liste, möchte nicht unhöflich sein, im Archiv habe ich zum Thema Funcube und dem py Script nichts gefunden. Wer kann mir mehr Informationen geben? Gibt es ein extra Wiki oder einen Blogbeitrag? Screenshots? Suche mehr Informationen wie ich den Funcube mit dem Script auf einem Ubuntu System einsetze. Danke. Gruß Markus

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GSMTAP now creates a locally bound receive socket
by Harald Welte 23 May '11

23 May '11

Hi! libosmocore >= 0.3.1 and the current osmo-tetra code will now generate not only the sending GSMTAP UDP socket, but also a locally-bound receive socket. This avoids the manual start of "nc -l -u -p 4729 >/dev/null" or iptables rules to drop the UDP packets. The local receive socket is only created if the GSMTAP IP address is a locally configured address on any of your network interfaces. So sending it to 127.0.0.1 should work well. Don't be surprised if you happen to see GSMTAP over IPv6, I'm now using getaddrinfo() and related functions, i.e. "loopback" may now resolve to ::1 instead of 127.0.0.1 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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Osmocom project vs. sysmocom GmbH
by Harald Welte 14 May '11

14 May '11

Hi all! As some of you already know, Holger and I have recently started a new company called "sysmocom - systems for mobile communications GmbH". The process of establishing the new company has now formally concluded. Before some rumours start to spread, we would like to clarify some points and make sure there is mutual understanding between the Osmocom community and the sysmocom company. sysmocom is intended to provide commercial offerings related to the Osmocom projects. This is not entirely new. Especially on the network side, people like Holger and I have been doing quite a lot of paid development to bring those projects forward. We would not have many of the features we have today, if it wasn't for customers who actually pay us for development of OpenBSC, OsmoBSC, OsmoSGSN and the various side projects more targetted at a real network operator like cellmgr-ng, bsc-nat, gb_proxy - just to name a few. However, this has always only been freelancing development of Software. With sysmocom, we want to go one step further and work on hardware products related to the various Free Software projects. Right now I don't want to talk too much about unfinished products, but we are working towards an inexpensive BTS product, we are funding the prototypes for Osmocom SIMtrace, and we will likely also see stuff like OpenBSC appliances. Given our past involvement and exposure into other projects that share a split Free Software / business set-up, we think we understand very well where potential issues of conflict between the two sides may be. Let me make some more clarification what this is not about: * sysmocom is not about creating proprietary derivates of Osmocom software. We work on Free Software which is publicly available under OSI approved and FSF endorsed licenses. We may offer proprietary hardware and sometimes software - but those are independent projects from existing Osmocom software. * we specifically will not have a public and a non-public version of the same program with differences in features. * sysmocom is not a VC-funded startup. It's a very small company run out of personal funds with no intention to take external funding or grow rapidly. Nobody but Holger and I determine where it goes and what it does. * sysmocom does not hold any copyright on the Free Software projects. The copyrights stay distributed with the major authors such as Holger, Onwaves, Sylvain, Dieter, Andreas and myself. None of the others have any affiliation with sysmocom. I have (personally, unrelated to sysmocom) asked some of the smaller contributors for a copyright transfer to make sure we could do the AGPLv3 transition, or future re-licensing decisions without having to ask dozens and dozens of people. sysmocom does not seek to control the Free Software projects. * we will maintain a strict separation between the community side of things and the business side. Unlike some other popular projects, we will not end up in a situation where the osmocom.org websites will be full of advertisements and hidden links that lure you on the company website. * we will keep a strict separation of naming. Osmocom is for the FOSS projects, sysmocom for the business. The company will use the term "Osmocom" only in descriptive context, not as a product name, brand or for advertisement. If you do have any concerns, please feel free to share them. However, I'd like to avoid cross-posting them throguh different mailing lists. Please follow-up-to openbsc(a)lists.osmocom.org Regards, Harald -- - Harald Welte <hwelte(a)sysmocom.de> http://www.sysmocom.de/ ======================================================================= * sysmocom - systems for mobile communications GmbH * Schivelbeiner Str. 5 * 10439 Berlin, Germany * Sitz / Registered office: Berlin, HRB 134158 B * Geschaeftsfuehrer / Managing Directors: Holger Freyther, Harald Welte

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Planning for Radio Village at 2011 CCC Camp
by Harald Welte 13 May '11

13 May '11

Hi all! [This message is cross-posted to many lists, please be careful when replying to it! Think twice if your respones really matters to all those projects...] In order to do some better planning for our Camp activities this summer, I would like to request all people who intend to participate in the radio village to add themselves to the wiki: https://events.ccc.de/camp/2011/wiki/index.php/RadioVillage The list of citizens is auto-generated if you use Person template like I have done in my user page at https://events.ccc.de/camp/2011/wiki/index.php/User:LaForge The large main tent is not really intended as a place to sleep, but more like a place where we set up our gear and work on the various projects, similar to what happened at HAR. Thanks in advance! -- - 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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tetra-rx was missing the LLC layer
by Harald Welte 27 Apr '11

27 Apr '11

Hi! during some work over the last weekend on OsmocomTETRA and reading through many hours of real-world TETRA captures, I have realized that a lot of the data we displayed about the higher protocol layers (like MM, CMCE, ...) was completely bogus. The reason for it is simple and quite obvious: My old code made the assumption that the MLE layer is directly on top of the MAC layer - whereas in reality, there is the LLC layer in between. Not only that, but LLC also takes care of fragmentation and re-assembly, i.e. we were just printing some general nonsense. I've started to fix this in the git master banch and I have some local uncommitted code that actually implements re-assembly. I've successfully decoded some NTP/UDP/IP-in-SNDCP-over-TETRA frames from a real network, but the implementation is a big ugly hack and has many constraints. I will try to clean this up asap and commit it (maybe even later today). This posting is JFYI, so you are not surprised if you now get some completely different output with the same input data. The good part is that we actually get the CMCE messages that tell us when and where will be voice frames that belong together, i.e. we can identify start and end of indivdiual push-to-talk 'segments'. This could be a nice base for extracting them in a useful format. 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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educational samples and theoreticaly ways to get them
by Marius Ciepluch 26 Apr '11

26 Apr '11

Hi! My name is Marius and yesterday, though I was in a hurry to catch my train back to HL, I was in Harald's ETSI Tetra presentation. It was great; and I do have a USRP2, portable power supply, a sailing license (there're these big coast-guard towers here). Any implications are theoretically of course at this point. Just a small question: can one expect legal trouble if... accidently though... some Tetra signals found their way into a GR cfile onto some web server and would be shared (here)? Afaik it's not excactly ISM band. And to the second question: what was the name of the recommendable book, that was not marketing foo? I'd like to give the cryptanalysis a try, but before I can say that I have to look at the standards and algorithms. Did anyone already review that? I know that Stephen Glass of the OP25 project did some research on APCO 25. - Which isn't ETSI. Best, Marius -- pgp id: 0xCCCA5E74, mc - at - sandokai.eu http://crazylazy.info/blog, twitter: @wishinet

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