@vertigo @gled CAT cable with a USB ftdi to control the rig with either rigctl ( hamlib ) or flrig/fldigi or wsjtx on the raspberry pi. Second din cable for the audio connection.
I can do digital by ssh / x11vnc on the pi, or use pulseaudio tunnel sink/source to process on the laptop ;)
Ptt via CAT, can do phone mode with the headset plugged in the laptop ;)
Only issue, the CAT supported command set is very limited on the ft857d I have , so still trying to reverse the missing commands...