SDR# TETRA demod plug-in: http://rtl-sdr.ru/page/plagin-dlja-priema-tetra (https://github.com/vgpastor/SDR-Tetra-Plugin) features UDP output port in config.
Tetra-rx program (MSYS2 required in Windows) accepts its output data (which is demodulated dibits)

Wireshark adapter for capturing local loopback traffic shows tetra-rx messages

Raw data logging in Wireshark can be done with local loopback traffic capture by using capture filter udp port x