Re: [gpsd-users] Polling for GPS data using python3 API

[Gary E. Miller]

Yo pisymbol!

For some reason your email client is quoting strangely, so hard to
tell what is repeated and what is new.

On Tue, 13 Aug 2019 11:57:33 -0400
"pisymbol ." <address@hidden> wrote:

> > With the newer style API, if I want to take real-time samples from
> > the Trimble via gpsd  can I just so session.next()? Will that
> > always give me the latest sample?
> >
> > It looks like the samples are buffered so I would have to
> > continually  
> drain it to get the latest sample, is that right? I am doing that now
> in a separate process (it just copied out the latest sample so an
> arbitrary number of threads and read it).

The samples are buffering because you are not reading them.  You need
to keep up with the incoming messages.

> Finally, my Trimble is emitting GGA strings and I want to get the fix
> (if it's in RT[KX] mode (4)). How do I get that from the report? I
> don't see it.

GGA is not enough.  Try "gpsutil -n" to setup your GNSS with a good
sentence mix.  That works on a lot of receivers.

A good mix, depending on your application, may be something like:

 GPGLL   - Geographic Position - Latitude longitude
 GPRMC   - Recommended Minimum Specific GNSS Sentence
 GPVTG   - Course Over Ground and Ground Speed
 GPGGA   - GPS Fix Data
 GPGSA   - GNSS DOPS and Active Satellites
 GPGSV   - GNSS Satellites in View
 GPZDA   - Time & Date

Without knowing your Trimble model, and application, it is hard to say
what your optimal may be.

RGDS
GARY
---------------------------------------------------------------------------
Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
        address@hidden  Tel:+1 541 382 8588

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    "If you can't measure it, you can't improve it." - Lord Kelvin

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