Just wanted to make a note that I’ve got this working, very rough code is available here:
https://github.com/Hueburtsonly/doppler
On my computer, I had absolutely no luck with libftd2xx, which is the official FTDI library, the one included with the Signal Hound drivers (it simply couldn’t find the virtual COM port, even though lsusb was listing it). However libftdi, the alternate version of the same library, worked flawlessly straight away. So for Linux I’d recommend libftdi to other customers, as well as the dev staff at Signal Hound.
