Provided by: gpsd-clients_2.30-1ubuntu3_i386 bug


       gpsfake - test harness for gpsd, simulating a GPS


       gpsfake [-h] [-b] [-c interval] [-i] [-D debuglevel] [-l] [-m monitor]
               [-o options] [-p] [-r initcmd] [-s speed] [logfile]


       gpsfake is a test harness for gpsd and its  clients.  It  opens  a  pty
       (pseudo-TTY),  launches  a  gpsd instance that thinks the slave side of
       the pty is its GPS device, and repeatedly feeds the contents of a  test
       logfile through the master side to the GPS.

       gpsfake  does  not require root privileges, and can be run concurrently
       with a production gpsd instance without causing problems.

       The logfile may be of NMEA, SiRF-II packets, or Zodiac packets. Leading
       lines beginning with # will be treated as comments and ignored.

       The  gpsd  instance  is  run in foreground. The thread sending fake GPS
       data to the daemon is run in background.


       The -b option enables a twirling-baton progress indicator  on  standard
       error. At termination, it reports elaped time.

       The  -c  option sets the delay between sentences in seconds. Fractional
       values of seconds are legal. The default is zero (no delay).

       The -l option makes the program dump  a  line  or  packet  number  just
       before  each  sentence is fed to the daemon. If the sentence is textual
       (e.g. NMEA, the text is dumped as well).

       The -i option is for single-stepping through  logfiles.  It  dumps  the
       line  or  packet  number  (and the sentence if the protocol is textual)
       followed by "? ". Only when the user keys Enter is  the  line  actually
       fed to gpsd.

       The  -m  option  specifies  a  monitor  program inside which the daemon
       should be run. This option is intended to  be  used  with  valgrind(1),
       gdb(1) and similar programs.

       The  -o option specifies options to pass to the daemon. Passing "-n" is
       often useful. The -D option passes a -D option to the daemon: thus -D 4
       is shorthand for -o "-D 4".

       The  -p  option  dumps the NMEA and GPSD notifications generated by the
       log to standard output. The logfile is  interpreted  once  only.  (This
       option is intended to facilitate regression testing.)

       The -r option specifies an initialization comand to use. The defaylt is
       "w+r+"; "r=2" might be another interesting value.

       The -s option sets the baud rate for the  slave  tty.  The  default  is

       The -h option makes gpsfake print a usage message and exit.

       The  argument  must  be  the  name  of a file containing the data to be
       cycled at the device. gpsfake will print a notification  each  time  it


       gpsfake  is  a  trivial  wrapper  around  a  Python  module, also named
       gpsfake, that can be used to fully script  sessions  involving  a  gpsd
       instance,  any  number of client sessions, and any number of fake GPSes
       feeding the daemon instance with data from specified sentence logs.

       Source and embedded documentation for this module is shipped  with  the
       gpsd  development  tools.  You  can  use it to torture-test either gpsd
       itself or any gpsd-aware client application.


        gpsd(8), xgps(1), libgps(3), libgpsd(3), gpsprof(1), gnuplot(1).


       Eric S. Raymond <>. There is a  project  page  for  gpsd