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Great tutorial! There is a typo in the Setup the GPSd daemon section of code. One line contains the weird quotation mark instead of the "standard" mark. Honest it had me on a chase for two days.

START_DAEMON="true" USBAUTO="false" DEVICES="/dev/ttyAMA0 /dev/pps0″ GPSD_OPTIONS="--nowait --passive --speed 9600"

Notice DEVICES has the quirky quote at the end.

This has caused me some hair-pulling. In the setup of GPSD daemon section, there is an unmatched quotation mark:

DEVICES="/dev/ttyAMA0 /dev/pps0″

The line should read:

DEVICES="/dev/ttyAMA0 /dev/pps0"

Thanks for the tutorial!

I can't seem to get that to work. I get the following error when trying to enable tempcomp:

chronyd[79733]: Fatal error : Could not read tempcomp point from /etc/chrony/chrony.tempcomp

I tried playing with the permissions but no luck. System information below:

PRETTY_NAME="Debian GNU/Linux 12 (bookworm)"
NAME="Debian GNU/Linux"
VERSION_ID="12"
VERSION="12 (bookworm)"
VERSION_CODENAME=bookworm
ID=debian
Model : Raspberry Pi 3 Model B Plus Rev 1.3
Linux gps-pi 6.6.31+rpt-rpi-v8 #1 SMP PREEMPT Debian 1:6.6.31-1+rpt1 (2024-05-29) aarch64 GNU/Linux

Thanks for your great work!

Hi there and thanks for sharing your guide. I have a question regarding dscp.

You use

# Expedited Forwarding DSCP directive traffic
dscp 48

'Expedited Forwarding' (EF) is 46 and is recommended for NTP. NTPsec also sets it to 46 (101110).

Are there reasons or advantages to use 48 (Control / CS6) ?

About nice in Improve Chrony process priority, using systemd, this chrony option may also be helpful: sched_priority

Greetings, all! Great tutorial. I have a stable setup now with my 3B+ on the new Bookworm 64 bit OS. The only thing from this tutorial that doesn't work is the tempcomp section. In my chrony.conf file, I have the command listed exactly as it is in this tutorial:

tempcomp /sys/class/thermal/thermal_zone0/temp 30 /etc/chrony/chrony.tempcomp

My /etc/chrony/chrony.tempcomp file is populated exactly as shown in the tutorial:

20000 0
21000 0
25000 0
30000 0
40000 0

When restarting the chrony service, I get the following error:

Fatal error : Could not read tempcomp point from /etc/chrony/chrony.tempcomp

Did something change with the new OS, or am I missing a step somewhere? Thank you for your help!