Re: use gpsd and chrony time sync with fake gps

[Gary E. Miller]

Yo Lin!

On Tue, 30 Nov 2021 10:02:51 -0500
Lin Zhao <crazymumu0804@gmail.com> wrote:

> I tested my pps in oscilloscope, it looks good and stable. Also, I
> can try following: $ sudo ppstest /dev/pps1

Looks good.  But your json.log shows you are not telling gpsd to use
your pps:

{"class":"DEVICES","devices":[{"class":"DEVICE","path":"/dev/ttyTHS0","driver":"
NMEA0183","activated":"2018-01-28T16:18:20.767Z","flags":1,"native":0,"bps":9600,"parity":"N","stopbits":1,"cycle":1.00}]}

Note there is no PPS there.

There have been recent fixes for standalone PPS, please update to git
head, and try again.  Be sure /dev/pps1 is on your command line when you
start gpsd.

> I don't have -x option, wired.

Then you are using an old version of gpsd.  Please update to git head
and repeat.

> I record the gps  messags on my campus, then increase the time stamp based
> on that day,

Your NMEA data seems O to me.  The problem is your command line.

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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