Re: [gpsd-users] gpsd:ERROR: device open failed: Permission denied - retrying read-only

[Charles Muggen]

The stop and disable gpsd.socket comes directly from Adafruit's instructions.
https://learn.adafruit.com/adafruit-ultimate-gps-hat-for-raspberry-pi/use-gpsd

copied here for your convenience:

Raspbian Jessie systemd service fix
Note if you're using the Raspbian Jessie or later release you'll need to 
disable a systemd service that gpsd installs. This service has systemd listen 
on a local socket and run gpsd when clients connect to it, however it will also 
interfere with other gpsd instances that are manually run (like in this guide). 
You will need to disable the gpsd systemd service by running the following 
commands:
sudo systemctl stop gpsd.socket
sudo systemctl disable gpsd.socket

I also have an Uputronics GPS HAT.
https://store.uputronics.com/index.php?route=product/product&product_id=81
Is that a better platform to work with?
Should I just drop the Adafruit GPS HAT in the junk drawer?

> Sent: Wednesday, February 07, 2018 at 2:03 PM
> From: "Gary E. Miller" <address@hidden>
> To: "Charles Muggen" <address@hidden>
> Cc: address@hidden
> Subject: Re: [gpsd-users] gpsd:ERROR: device open failed: Permission denied - 
> retrying read-only
>
> Yo Charles!
> 
> On Tue, 6 Feb 2018 21:56:25 +0100
> "Charles Muggen" <address@hidden> wrote:
> 
> > I have a GPS HAT from Adafruit connected to the Raspberry Pi running
> > Raspbian Jessie. The plan is to get an accurate clock from the GPS
> > and 1 PPS combination and operate with no internet connection.
> 
> Iused to have that HAT.  Mine stopped working last month.
> 
> > I have gpsd and chrony installed.
> > ntpd is disabled.
> 
> Try NTPsec.
> 
> > Feb  5 23:20:47 raspberrypi gpsd[474]: gpsd:ERROR: device open
> > failed: Permission denied - retrying read-only Feb  5 23:20:47
> 
> You are running gpsd as root?  What is the command line you are
> using to start gpsd?  What are the perms on your /dev/ttyAMA0?
> 
> > if I stop and disable the gpsd socket as per Adafruit instructions,
> > somehow it recovers and tries to connect to chrony, but on the second
> > start up it's connecting to PPS1, not PPS0. the Adafruit manual says
> > to do the following:
> 
> Why are you using a socket at all??  Don't do that!
> 
> > sudo systemctl stop gpsd.socket
> > sudo systemctl disable gpsd.socket
> 
> Gack, sudo AND systemctl?  Don't do that!
> 
> > the contents of /etc/default/gpsd are as follows:
> 
> That file is NOT part of gpsd project.  You'd have to ask your
> distro about that.
> 
> > # Other options you want to pass to gpsd
> > GPSD_OPTIONS="-n /dev/ttyAMA0 /dev/pps0"
> 
> Suing a socket AND puytting the device in the gpsd options?  Don't do
> that!
> 
> RGDS
> GARY
> ---------------------------------------------------------------------------
> 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
>