op25-dev

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314 discussions

Christmas Announcements 2017
by ikj1234i＠yahoo.com [op25-dev] 05 Apr '18

05 Apr '18

ANNOUNCEMENTS =============== 1) New Web site Our new web site is now on the air! I'd like to thank Matt Ames for his efforts and hard work in reworking content to fit the new format. I'd also like to take this opportunity to thank our hosts at Osmocom, Harald and Holger, for kindly offering this free resource and home for the project. web site: http://op25.osmocom.org/ git repo: https://git.osmocom.org/op25 2) Recent additions and updates Several updates have recently been pushed and are in the 'max' branch of the repo. In addition to bug fixes in both transmitter and receiver applications and libraries, there are a couple of new features: * remote terminal: the curses terminal may now run in a separate process or on a separate machine from rx.py, with connectivity via UDP. * dstar transmitter configuration: the dstar specific config options for repeater 1/2, mycall, and urcall are now supported. 3) CPU usage reduction effort Except for the actual speech decoding process which remains unchanged, the channel tuning and demodulation logic has undergone some streamlining. The result should be a significant reduction in CPU usage in rx.py, especially during idle periods. It's possible some of these optimizations may be slightly too radical; it would be good to receive feedback from all users, but especially from those with- * crowded bands with close channel spacing * p25 phase 2/tdma talkgroups * "center frequency" set to zero in the trunking tsv file 4) New multiple rx app Released today (Dec. 25, 2017) is a sneak preview of a new receiver app, multi_rx.py. It should be considered alpha test grade. The highlights: * receives DMR/YSF/P25(P1) (DSTAR almost finished) * an arbitrary number of concurrently active SDR devices * arbitrary numbers of channels/frequencies For more information see the README file in the apps/ directory of the repo. All of these additions have been pushed to the 'max' branch of the repo. If you have a previous installation of OP25 you should change to the 'build' directory of that installation and do sudo make uninstall prior to pulling and building the new version.

7 24

Streaming audio from OP25/Raspberry Pi
by John Ackermann N8UR jra＠febo.com [op25-dev] 22 Mar '18

22 Mar '18

I just got my RPi scanner set up to stream audio to an Icecast server. Graham did all the hard work to figure out how, so he gets all the credit. But I did collect the information together in a blog posting here: http://blog.febo.com/wp/?p=307 I'm also going to update my plug-and-play image file to include this. It may take me a couple of days to get that ready. 73, John

4 9

OP25 RPi Image
by John Ackermann N8UR jra＠febo.com [op25-dev] 29 Jan '18

29 Jan '18

I finally had time to package up my OP25 system onto a ready-to-run image for an RPi3. This is based on the full Raspbian Stretch OS with GUI, so it's a 1.3 GB download. It's at http://febo.com/pages/os_images, along with a couple of other RPi images (one for an NTP time server, another that makes a bunch of RTL-SDR dongles look like a single Hermes HPSDR receiver). After downloading, unzip the file (it'll be a bit over 4GB) and write to an 8GB SD card. Stick the card in your Pi and wait for the desktop to appear. This system has Graham's (github.com/boatbod) latest code and if you happen to live in Montgomery County, Ohio, and have an HDMI monitor with speakers, you are all set to go. :-) Otherwise, you'll need to make appropriate edits to the config files and possibly change the sound settings. Enjoy! 73, John

2 2

multi_rx
by gnorbury＠bondcar.com [op25-dev] 20 Jan '18

20 Jan '18

FWIW i endeavor to keep my fork up to date with the max branch so multi_rx should be available in both versions. I've not personally testing it though, so I cannot offer help or guidance on setup and usage. Graham

3 3

Recent changes
by gnorbury＠bondcar.com [op25-dev] 21 Dec '17

21 Dec '17

For my version of op25 I've just pushed a change to support using hostnames/fully qualified domain names (or straight IP addresses) in the --wireshark-host command line parameter (-W). Earlier changes include the addition of the source radio id (where available) to the terminal screen, as well as indication of when encryption is active (only applies when using --nocrypt command line option).

4 14

rx.py Quirks
by Brett Friermood brett.friermood＠gmail.com [op25-dev] 18 Nov '17

18 Nov '17

Hello all, I've been excited about trying the new rx.py since it was first announced and finally was able to install it last night and was quite impressed. In the last couple weeks I've attempted to run it on my Toughbooks, running Debian, but have not been able to cleanly install the python-gtk2-dev dependency for gnuradio. Last night I dug my SDR/DSP computer back out from recent desk remodeling and fired it up. I purpose built this computer specifically to run OP25 and SDRTrunk on Ubuntu with an i7 processor, and large amounts of RAM, and an SSD. In addition to updating the original OP25 to latest, I also installed the boatbod version and spent most of my time running it. It was very nice to run in CLI only mode which I've wanted to do for a long time. By using the internal audio server and the "t" trunk-tracking command I was able to dial up every site I tried within my coverage area and start following traffic. It has been a while since I've used OP25 so I was midly surprised when I was able to receive a site that other software will not receive. I did notice a couple issues, though. I observed a crash when toggling off a plot. Turning on the plot would work fine, and even trying to turn on another would produce a warning that only one can be active, but everything continued running. However, when I turned off the plot the window would close as expected but then the terminal would freeze. After a couple seconds "0"'s would begin showing as if there was no data from the SDR. The only way I was able to fix it was to kill the python process. After starting again everything would work until turning off a plot. It also wasn't limited to a single plot as it happened with all of them. The second issue I faced was when trying to use a trunk.tsv file with the "T" option. After fixing my .tsv files after the quotes got obliterated it appeared to load and start running, however only showed a single site's information at the top of the terminal and another site's control channel frequency at the bottom. I ran short of time so I wasn't able to determine if it heard voice traffic or not, but it did not appear to be stepping through the different sites' control channels as configured in the .tsv file. Am I incorrect as to how the .tsv file is handled? Brett

3 6

boatbod's op25 github fork updated
by gnorbury＠bondcar.com [op25-dev] 30 Oct '17

30 Oct '17

For anyone interested, I have merged the latest changes to the osmocom max branch into my op25 github fork https://github.com/boatbod/op25 and added the ability to dynamically turn on and off the various plots (fft, constellation, symbol & datascope). These are controlled from the terminal window by pressing the 1, 2, 3 & 4 keys. 1 = fft 2 = constellation 3 = symbol 4 = datascope Presently it is only possible to enable one plot at a time. Once I figure out how to track and untangle the gnuradio inter-block connections, I will see about making them operate simultaneously. Graham

2 2

No audio
by Tom Hayward tom＠tomh.us [op25-dev] 19 Oct '17

19 Oct '17

I have an older system working fine on the master branch and I'm currently trying to set up a new VM running the max branch. The goal is to send audio from two talkgroups to darkice. The problem is that I'm not getting any audio out of rx.py. I know the darkice config works, because I can do this and hear pink noise on the stream: speaker-test -r 8000 -D hw:Loopback,0,0 But starting rx.py with the same audio device like this, I never hear anything: ./rx.py --args rtl=0 -N LNA:42 -f 774081250 -S 1320000 -v 5 -2 -T ss911_tacoma.tsv -O hw:Loopback,0,0 The receiver seems to be working. I can see the name of the talkgroup I'm interested in at the bottom of the screen while it's active, I just don't hear anything on the stream: """ NAC 0x1e1 WACN 0xbee00 SYSID 0x1e7 774.431250/804.431250 tsbks 2390 voice frequency 773.431250 tgid(s) 40306 40107 0.3s ago count 77 voice frequency 774.681250 tgid(s) 59197 40106 0.3s ago count 166 Frequency 774.431250 Talkgroup ID 40106 PCSO East """ Is there something obvious I'm doing wrong here? P.S. Is there a better way to pipe audio to darkice than snd-aloop? Tom

2 6

A couple of patches [1 Attachment]
by John Ackermann N8UR jra＠febo.com [op25-dev] 15 Oct '17

15 Oct '17

Attached is a patch file that updates Max's terminal.py and trunking.py in a few ways: 1. terminal.py reads the window size at startup and adjusts the curses settings accordingly. If you set xterm or equivalent to more rows (I'm using 38), you can handle sites with more than 20 frequencies without crashing. This is the patch I posted a week or so ago. (Max, I think your idea of making the main window two columns is still a good one, and the space that frees up could be used to display other interesting info. I don't think I'll have the time to learn how to implement that, though.) 2. terminal.py now displays an info line at the bottom of the screen showing the keyboard commands that are available. I also added a blank line or two to make the display look (IMHO) a bit cleaner. 3. If you set -v to 5 or higher, every frequency or talkgroup command is output on stderr (this will generate a lot of output on a busy system!). If you want to generate a list of every unique frequency used by the system, this will produce it from the stderr.2 file: grep freq: stderr.2 | cut -d" " -f3 | sort | uniq or to get all the unique talkgroups: greg freq: stderr.2 | cut -d" " -f5 | sort | uniq Max, this was actually a bit less trivial than first thought. The code is easy, but where to put it wasn't. Your suggestion about the end of update_state() led to only one update per second, and lost many freq/talkgroup set commands. I think I found a spot that doesn't miss any. Lots of output, but lets you build a comprehensive tgid list. 4. The stderr output of "set trunk_cc..." was not all that useful, so it's now set to appear only when the -v level is set to 6 or greater. (Behavior of -v 10 includes the above but is otherwise unchanged.) 5. I cleaned up all the logging/status/debug outputs in trunking.py to use "sys.stderr.write()" rather than "print". That will stop them from showing up in the terminal screen. While I was at it, I also added newlines to the end of all output and did some other cleanup. Hope this is useful. 73, John

2 1

Ubuntu 14.04 Audio Crashing
by 'William Becks' wa8wg＠centurytel.net [op25-dev] 12 Oct '17

12 Oct '17

I have been chasing a problem with the audio crashing after 24 hours of continuous operation in Ubuntu 14.04 that appeared to have been caused by pulseaudio. However, that was apparently not the cause as the audio server still crashes after 24 hours even with pulseaudio removed from the system. This is the response that scrolls when performing a speaker-test once the audio server crashes. op25@op25-VirtualBox:~$ sudo speaker-test -t sine -f 500 -c2 [sudo] password for op25: speaker-test 1.0.27.2 Playback device is default Stream parameters are 48000Hz, S16_LE, 2 channels Sine wave rate is 500.0000Hz Rate set to 48000Hz (requested 48000Hz) Buffer size range from 2048 to 16384 Period size range from 1024 to 1024 Using max buffer size 16384 Periods = 4 was set period_size = 1024 was set buffer_size = 16384 0 - Front Left 1 - Front Right Time per period = 0.162188 0 - Front Left 1 - Front Right Time per period = 0.172795 0 - Front Left 1 - Front Right Time per period = 0.171719 0 - Front Left 1 - Front Right Time per period = 0.170190 0 - Front Left 1 - Front Right Time per period = 0.168764 0 - Front Left 1 - Front Right Time per period = 0.176896 0 - Front Left 1 - Front Right Time per period = 0.172278 0 - Front Left 1 - Front Right Time per period = 0.172175 0 - Front Left 1 - Front Right Time per period = 0.171800 0 - Front Left 1 - Front Right Time per period = 0.172193 0 - Front Left 1 - Front Right Time per period = 0.170080 0 - Front Left 1 - Front Right Time per period = 0.173308 0 - Front Left 1 - Front Right Time per period = 0.172197 0 - Front Left 1 - Front Right Time per period = 0.172493 0 - Front Left 1 - Front Right Time per period = 0.172013 0 - Front Left 1 - Front Right Time per period = 0.171716 0 - Front Left 1 - Front Right Time per period = 0.172795 0 - Front Left 1 - Front Right Time per period = 0.176432 0 - Front Left 1 - Front Right Time per period = 0.172236 0 - Front Left 1 - Front Right Time per period = 0.172164 0 - Front Left 1 - Front Right Time per period = 0.172311 0 - Front Left 1 - Front Right Time per period = 0.171918 0 - Front Left 1 - Front Right Time per period = 0.169485 0 - Front Left 1 - Front Right Time per period = 0.169537 0 - Front Left 1 - Front Right Time per period = 0.176434 0 - Front Left 1 - Front Right Time per period = 0.172278 0 - Front Left 1 - Front Right Time per period = 0.168199 0 - Front Left 1 - Front Right ^CWrite error: -4,Interrupted system call (Control-C entered here to interrupt speaker-test.) xrun_recovery failed: -4,Interrupted system call Transfer failed: Interrupted system call op25@op25-VirtualBox:~$ Has anyone seen this behavior while running op25 on Ubuntu? Could there be a cron task that executes every 24 hours causing loss of the audio server?? Thank you, Bill, WA8WG

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