Re: Permission Error When Opening gpsd For XTRX Device

[Gary E. Miller]

Yo Bradley!

On Wed, 2 Sep 2020 11:54:28 -0400
Bradley McFadden <bmcfadden@laurentian.ca> wrote:

> I'm trying to set up gpsd to read data from the onboard gps that the
> XTRX radio provides.

What is this XTRX you speak of?  Why?

You skipped a bunch of important details:

1. What distro?
2. What version of gpsd?
3. Did you build gpsd, or is it from a package?

> In the devices list, it is listed as /dev/ttyXTRX0.

Better to show than paraphrase.  What does this show:

$ ls -l /dev/ttyXTRX0

> I can read data from this device using:
> stty -F /dev/ttyXTRX0 speed 9600 && cat /dev/ttyXTRX0.

You fail to note whehter that is as root, or a user.

> The error I'm getting is this:
> sail@gr110:~/Desktop$ sudo gpsd -n -N -D5 -S 3900 /dev/ttyXTRX0

1. Never use sudu, it is security theater and does surprising things.

2. "-S 3900".  Why are you using TPC port 3900??

> gpsd:INFO: launching (Version 3.20)

Old version.

> gpsd:INFO: listening on port 3900

"-S 3900".  Why are you using TPC port 3900??

> gpsd:ERROR: SER: device open of /dev/ttyXTRX0 failed: Permission
> denied - retrying read-only

Back to what dies "ls -l /dev/ttyXTRX0" say?

> This error doesn't make sense to me as I've checked that the user and
> gpsd are both in the dialout group.

Uh, remember that sudo?  You are not running as "user'.

Don't use sudo!

> If I can read the data from the device, why can't gpsd open it?

Dunno, insufficient data.  See above.

RGDS
GARY
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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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