Rvtdump is a utility that listens on a serial port, receives traces or any other
packets emitted by the running firmware of a GSM device in TI's RVTMUX format,
decodes them into readable ASCII and emits them to stdout and/or to a log file.
It is to be invoked as follows:

rvtdump [options] /dev/ttyXXX

where the sole non-option argument is the serial port it should open and listen
on.

The available options are:

-b

	Normally the rvtdump process remains in the foreground and emits its
	output on stdout.  The -b option suppresses the normal output and causes
	rvtdump to put itself in the background: fork at startup, then have the
	parent exit while the child remains running.  -b is not useful and not
	allowed without -l.

-B baud

	Selects which RVTMUX serial channel baud rate our tool should listen
	for.  Defaults to 115200 baud, which appears to be TI's default and is
	correct for mokoN, leo2moko and Pirelli's fw.  Use -B 57600 for Compal's
	RVTMUX, the one accessible via **16379#.

-d <file descriptor number>

	This option is not meant for direct use by human users.  It is inserted
	automatically when rvtdump is launched from fc-xram as the secondary
	program that immediately takes over the serial channel.

-l logfile

	Log all received and decoded packets into the specified file in addition
	to (without -b) or instead of (with -b) dumping them on stdout.  Each
	line in the log file is also time-stamped; the timestamps are in GMT
	(gmtime(3)) instead of local time - Spacefalcon the Outlaw dislikes
	local times.