There is someone using Gnu Radio software with Ciao Radio, an Italian
SDR (see: http://www.comsistel.com/Ciao%20Radio.htm) for HF rx.
Software for this SDR is Windows only and I will use it on my Linux box.
On Users Group for this SDR there is no Linux users.
On same Users Group there is a description of sw protocol for sending
messages to radio and also a C++ set of routines for this job.
I am not a software developer but I hnow Python.
Can I try some function for initially getting info and signal?