October 2017 - op25-dev - lists.osmocom.org

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

1 0

OP25 on Ubuntu 14.04
by 'William Becks' wa8wg＠centurytel.net [op25-dev] 11 Oct '17

11 Oct '17

Gents, Has anyone else observed that pulse audio seems to crash consistently after approximately 24 hours of continuous operation of Ubuntu14.04? This happens regardless of the branch of op25 built on the system. I have searched the web for this problem and have tried a number of fixes for the pulse audio crash but none of them have corrected the problem. I have tried uninstalling pulse audio to use the underlying ALSA, but can't seem to maintain reliable audio level settings after a shutdown or a reboot. Any ideas or suggestions would be appreciated. Thank you, Bill, WA8WG

2 7