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Re: GPSD 3.24: Prevent from auto-reconfiguring u-blox NEO-M9N
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From: |
Gary E. Miller |
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Subject: |
Re: GPSD 3.24: Prevent from auto-reconfiguring u-blox NEO-M9N |
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Date: |
Tue, 6 Dec 2022 10:26:06 -0800 |
Yo ZB!
On Tue, 6 Dec 2022 06:55:50 -0700
ZB <balinfd3@gmail.com> wrote:
> I have a U-Blox NEO-M9N (SparkFun), connected via USB-C (for data and
> power) to Linux Mint 20.3 64-bit, running GPSD v3.24 (compiled from
> source) and CHRONY v4.2 (compiled from source).
Fair enough.
> The issue I am having is that when I run gpsd it auto-reconfigures
> the M9N receiver.
As documented. Very intentional.
> What I mean is this: I have used U-Center from u-blox to configure
> my M9N so that it only pushes GPGGA and GPRMC NMEA messages.
Not a good idea.
> If I run
> gpsd with the "-b" flag option,
-b, --readonly = bluetooth-safe: open data sources read-only
You are running MEO-M8N on bluetooth? Otherwise, the option you
are looking for is "-p".
> BUT...if I run gpsd as I
> normally would: "gpsd -n /dev/ttyACM0", then the M9N starts spitting
> out a TON of NMEA message types:GPGSV, GPRMC, GPGGA, GPZDA, NAV,
> etc...etc...
That is a good thing.
> The problem is that if I leave gpsd running with "gpsd -b -n
> /dev/ttyACM0", then the CHRONY socket "refclock SHM 0 refid GPS
> precision 1e-3 poll 3" stops communicating with GPSD: the reach
> slowly fades away from 377 down to 0.
Because just GPGGA and GPRMC may not be sufficent for NTP.
> If I run gpsd without the "-b" option, then the reach gets to 377 very
> quickly on the CHRONY socket but the u-blox spits out a ton of NMEA
> messages.
Both good things.
> Question: how can I prevent GPSD from modifying my u-blox receiver
> whilst at the same time have the CHRONY socket SHM 0 also work
> properly ??
Use -p, and configure your M8N properly.
RGDS
GARY
---------------------------------------------------------------------------
Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
gem@rellim.com 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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