GSM receiver with gr-gsm and Wireshark

In this example, we propose to decode GSM beacons thanks to a module available at As explained in this page, its installation can be performed thanks to PyBombs which should be already installed if you followed our installation guide. In your PyBombs directory, issue the following instruction:

sudo ./pybombs install gr-gsm
sudo ldconfig

In order to use this module with USRP hardware, you should use the following GRC flowgraph.

Once the GRC program is launched and configured on a GSM beacon frequency, decoded data is displayed on standard output as well as on a UDP socket. Wireshark can thus be used to dissect captured frames:

sudo wireshark -k -Y '!icmp && gsmtap' -i lo