Problems with maint-3.8 branch

[cd-sdr]

I have just installed gr-gsm on Kali Rolling 2020.1 like this:

apt install cmake autoconf libtool pkg-config build-essential python-docutils libcppunit-dev swig doxygen liblog4cpp5-dev python-gtk2 gnuradio-dev gr-osmosdr libosmocore-dev liborc-dev
git clone -b maint-3.8 https://github.com/velichkov/gr-gsm.git
cd gr-gsm
mkdir build
cd build
cmake ..
make
make install
ldconfig
export PYTHONPATH=/usr/local/lib/python3/dist-packages/:$PYTHONPATH

but when I run grgsm_scanner -d I get the following error:

Args= 
[INFO] [UHD] linux; GNU C++ version 9.2.1 20200104; Boost_106700; UHD_3.15.0.0-2
[ERROR] avahi_service_browser_new() failed: Bad state
Found Rafael Micro R820T tuner
gr-osmosdr 0.2.0.0 (0.2.0) gnuradio 3.8.1.0
built-in source types: file osmosdr fcd rtl rtl_tcp uhd miri hackrf bladerf rfspace airspy airspyhf soapy redpitaya freesrp 
Using device #0 Realtek RTL2838UHIDIR SN: 00000001
Found Rafael Micro R820T tuner
[R82XX] PLL not locked!
Exact sample rate is: 2000000.052982 Hz
[R82XX] PLL not locked!
Allocating 15 zero-copy buffers
OOOArgs= 
[ERROR] avahi_service_browser_new() failed: Bad state

and then it repeats itself until it aborts. Is this a dependency error?

[velichkov]

Hi @cd-sdr,

[ERROR] avahi_service_browser_new() failed: Bad state

To suppress this error run the grgsm_scanner with --args=rtl parameter as you are using an RTL-SDR device.

grgsm_scanner --args=rtl -d

[R82XX] PLL not locked!

This message is normal and you can safely ignore it.

and then it repeats itself until it aborts.

What do you mean by "it aborts"?

Is this a dependency error?

No.

[cd-sdr]

OK, thanks for the RTL argument, that's good to know.

What I mean is it finishes without find any frequencies. I remember using this a few years back on a different OS and it picked up 4 or 5 stations, and my phone says it has full signal here so I would expect it to find something. Is there a possibility it's not working? What can I do to test it?

[velichkov]

Hi @cd-sdr,

What I mean is it finishes without find any frequencies.

Do you have a suitable antenna attached to your RTL device? In case you are inside of a big building try moving near a window or outside.

I remember using this a few years back on a different OS and it picked up 4 or 5 stations,

In which country do you live? Have you tried scanning the other bands supported by your RTL device?

and my phone says it has full signal here so I would expect it to find something.

Is you phone in "2G Mode" only? Note that gr-gsm supports only 2G GSM and does not support CDMA, 3G or 4G LTE.

Is there a possibility it's not working?

There are always such possibility.