Trying to get my new Android device configured with XCSoar and I'm faced
with the question of my recorder serial number. Can I recover that from one
of the log files or do I have to trek to the airport (it's snowing outside),
hook up, and read the serial number from the CAI-302?

The logs I've got on my Android are of the form, XCS-AAA-nn, where nn is a
one-up number. It doesn't seem that XCS-AAA would be a serial number.