One can confuse TRX control interface with libosmoctrl's one.
TRX toolkit is not using libosmoctrl, and will never do. But,
in order to avoid this confusion, and potential confusion of
DATA interface, let's call them 'TRXC' and 'TRXD' in logging.
This toolkit has branched out into several different tools for
TRX interface hacking, and creating a virtual Um-interface
(FakeTRX) is only one of its potential applications.