This object currently only holds the serial number of the attached
AHRS board. This will be retrieved each time communications are
(re)established with the AHRS board.
This will eventually be extended to hold some statistics for OP to
AHRS comms.
git-svn-id: svn://svn.openpilot.org/OpenPilot/trunk@1008 ebee16cc-31ac-478f-84a7-5cbb03baadba
