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Re: gpsd accessing a non-permanent port

From: Gary E. Miller
Subject: Re: gpsd accessing a non-permanent port
Date: Sun, 29 Aug 2021 22:57:23 -0700

Yo Tom!

On Fri, 27 Aug 2021 15:08:14 +1200
Tom Isaacson <> wrote:

> How good is gpsd at handling non-permanent ports?

gpsd does not directly handle that.  It is the job of you udev, eudev,
or systemd to detect a newly attach GNSS receiver and coonnect it to

Results vary dramatically depending on many factors.

> I want it to connect
> to /dev/ttyUSB1 but this is an LTE module.

Not enough information to know.  Depending on your distro, your
configuration, installed drivers, and the module model it may
work well, or never.

> If the user inserts a new
> SIM card the LTE module may reboot itself to load new firmware for a
> different carrier so the USB port may disappear and reappear. Can gpsd
> handle this? If not, how do I find out if it needs to be restarted?

Even more unknown details that you want answers for.

Just try if and see how well it works.  If it does not work then
I'll have a large number of questions for you.

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