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Re: [gpsd-users] Get fix mode with disconnect antenna

From: Gary E. Miller
Subject: Re: [gpsd-users] Get fix mode with disconnect antenna
Date: Tue, 19 Nov 2013 10:11:28 -0800

Yo Yakov!

On Tue, 19 Nov 2013 09:58:42 +0200
Yakov Shmulevich <address@hidden> wrote:

> > > You don't understand me, I disconnect the antenna, so at this time
> > > the PVT data by sure changed.
> >
> > Are you sure?  Do you see that in the debug output?  Most GPS will
> > just stop sending anything when they lose the antenna.
> >
> I run gpspipe at this  time and see all periodical NMEA messages come.
> And in the GGA message I see GPS Quality Indicator=0 (Fix not
> available or invalid)

Can you make a copy of the gpspipe output and annotate it with the
remove event?

> More then, if I reconnect my client by gps_close() and gps_open() I
> got gpsdata.fix.mode = MODE_NOT_SEEN.


> But if I not reconnect my client I continue to get MODE_3D

Expected, that means you client has cached the last state.

> > > But I got the data as before disconnecting antenna, include
> > > gpsdata.fix.mod=MODE_3D.
> >
> > Is so, we need to see some debug output to see what is happening.
> >
> What debug print you need? I can run the gpsd with -D 7 and send you ?

gpspipe will do to start.

> > > I found the workaround, but it seems me very ugly.
> > > Now every time that I want to get PVT data, I open the session by
> > > gps_open(), and after I get the PVT data I close the session by
> > > gps_close(). Also this solution have some strange behavior - I
> > > found that after gps_open() I get right PVT data only after 3-5
> > > gps_read().
> >
> > Sounds like you are not starting gpsd with -n.  Can you confirm how
> > you are starting gpsd?
> >
> gpsd -b -n /dev/ttyUSB1

That is good, except we discourage the use of -b.  That is intended mostly
for broken bluetooth GPS.  Why are you using that?

Not knowing what you are doing in the gps_read() it is hard for us to
comment.  Can you see this behavior in cpgs or gpspipe?  Something we
can duplicate?

Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97701
        address@hidden  Tel:+1(541)382-8588

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