Re: No sentence logs

[Gary E. Miller]

Yo tangoing.mill745@aceecat.org!

On Wed, 13 Mar 2024 11:37:05 -0700
tangoing.mill745@aceecat.org wrote:

> I'm trying a different tack now, so this will wait. Running gpsd is
> kind of wasteful for me anyway; the end goal is to feed the time info
> to chrony. I initially included gpsd in the picture because I worried
> about binary compatibility for the shm segment, but now I see that
> chrony has hand written code for this anyway, bypassing libgps. So
> it's in fact safer for me to do the same and code to the chrony
> interface directly.

Be careful with the SHM code, get the locking correct.  Take a
look at the chronyd socket interface, it is more modern.

> Ok. Here's the raw dump script, only minimally modified from one
> provided gracefully by adafruit:

Thanks.  I have some Quic cables coming, I'kk give that a try this year.

> > Care to share what you configured your receiver to send?  gpsd
> > tries to work with whatever it can get, but many ways tobe
> > suboptimal.  
> 
> GGA, RMC and ZDA. I didn't see anything else in the dump.

That should be sufficient.  But don't expect your time to be accurate
to better than a few 100 milli sec.

> > Is this a u-blox?  If so, why send NMEA insteaad of ubx?  
> 
> It's this one:
> 
> https://learn.adafruit.com/adafruit-mini-gps-pa1010d-module

Mediatek MTK3333 receiver.  Looks nice.  But their are newer MTK
GNSS at cheaper prices.  Fine if you only need one, or a few.

Configuring it, and then decoding the GGA, RMC, and ZDA will not be
a lot of work.  But it will be specific to that chip.

Let us know how it turns our.


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

            Veritas liberabit vos. -- Quid est veritas?
    "If you can't measure it, you can't improve it." - Lord Kelvin

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