[ntp:questions] ntpd preplug for detachable gps or testing

Uwe Klein uwe at klein-habertwedt.de
Tue May 17 21:20:34 UTC 2011

Rob wrote:
> Uwe Klein <uwe at klein-habertwedt.de> wrote:
>>I needed to sync a box to gps/nmea.
>>But GPS and all other incoming nmea messages pass
>>via socket connection into the main app.
>>So I wrote a "pre"plug for ntp that indirects the
>>gps tty into a pty.
>>i.e. the pty behaves like the tty ( with attached gps )
>>nmea sentences are handed in via udp socket
>>from either another app or via a helper script that
>>opens and reads a "real" gps device when available.
>>	http://wiki.tcl.tk/28358
> The usual way of doing this is with the "gpsd" server.
> It handles all your GPS devices and provides an API for
> one or more applications that use the GPS data, plus a shared
> memory interface to NTP for time sync.

Actually not.

I get _all_ nmea sentences of the system piped through one socket.
the main application munges all of them ( and the majority is AIS stuff).

So the easiest way is to just select the RMC messages and forward those
to ntp in some way.


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