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Re: [gpsd-users] SHM number changing on reconnect

From: Gary E. Miller
Subject: Re: [gpsd-users] SHM number changing on reconnect
Date: Wed, 12 Sep 2018 12:08:31 -0700

Yo Zach!

On Wed, 12 Sep 2018 11:21:10 -0400
Zach LaCelle <address@hidden> wrote:

> I have a GPS receiver connected over USB that, when GPSD boots, has
> the SHM timing interface as 0 (ntpshmmon puts out NTP0 as the
> source). However, when I unplug and replug the device, Iget SHM 2
> (ntpshmmon puts out NTP2). All future replugs are at NTP2.


My guess is that when you unplug, the kernel is confused, so it keeps
the old interface around.  The next time you plug in the USB, it
is assigned new devices, so gpsd has to increment the SHM.

> How can I get GPSD to stay consistent with the SHM it writes to? I
> only have one receiver attached.

First, we need to know what version of gpsd you are using, and how
you are starting it.  Is systemd in the mix?

Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
        address@hidden  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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