Fwd: use gpsd and chrony time sync with fake gps

[Lin Zhao]

Hi Gary,

Sorry for late reply.

After your suggestion:

> You forgot the "-n" option to gpsd. It is essential for timekeeping.

Now I start with following commands:

/etc/chrony/chrony.conf:

driftfile /var/lib/chrony/drift

allow

# set larger delay to allow the NMEA source to overlap with

# the other sources and avoid the falseticker status

refclock SOCK /var/run/chrony.ttyTHS0.sock refid GPS precision 1e-1 offset 0.9999

refclock SOCK /var/run/chrony.pps1.sock refid PPS precision 1e-7  

Start commands:

sudo killall -9 gpsd chronyd

sudo chronyd -f /etc/chrony/chrony.conf

sleep 2

stty -F /dev/ttyTHS0 speed 9600

sudo gpsd -n /dev/ttyTHS0 -F /var/run/gpsd.sock

sudo ntpshmmon :

> # gpsd -nND 4 /dev/ttyTHS0 > tmp.log 2>&1

Please see attached log file from you suggested commands

> You at least have to change the time stamps.

The GPS example I taken from a Ultimate GPS record, I do increase time stamp every second and keep other information.

Thanks for your help, please let me know what else you need.

Best regards,

-------------------------------------------------

Lin Zhao

tmp.log
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