Re: Not able to get GPSD and NTP talking

[Gary E. Miller]

Yo TarotApprentice!

On Sun, 4 Oct 2020 22:25:08 +0000 (UTC)
TarotApprentice <tarotapprentice@yahoo.com> wrote:

> I am having an issue getting ntp working with gpsd. Hardware is a
> Raspberry Pi4 model B with a ublox 8 model GR-801 USB connected GPS.

Don't expect to get accurate time out of a plain GR-801.

> Software is Raspberry Pi OS (64 bit) running their 5.4.51 kernel, ntp
> is 4.2.8p12+dfsg-4 from repo and gpsd is 3.20 from the
> buster-backports repo.

OK.  We receommentd NTPsec instead of NTP classic.

> which tells me the gps has a 3D fix and is providing data.

Yes.  That does ntpshmmon show you?

> Oct 05 08:34:43 *** ntpd[455]: Soliciting pool server 162.159.200.123
> Oct 05 08:34:43 *** ntpd[455]: Soliciting pool server 27.124.125.251
> Oct 05 08:34:43 *** ntpd[455]: Soliciting pool server 103.214.220.220
> Oct 05 08:34:44 *** ntpd[455]: Soliciting pool server 45.124.53.221
> Oct 05 08:34:44 *** ntpd[455]: Soliciting pool server 103.38.120.36
> Oct 05 08:34:45 *** ntpd[455]: Soliciting pool server 61.68.38.238
> Oct 05 08:34:46 *** ntpd[455]: Soliciting pool server 144.48.166.166
> Oct 05 08:34:47 *** ntpd[455]: Soliciting pool server

I see nothing about using SHM there.  What is in your ntp.conf?

>  ntpq -p

I see SHM(0) dna SHM(1) there.  Don't bother with SHM(1), you have no PPS.

> Which suggest it can't access the shared memory segments.

No, your ipcs -m shows two nattach: gpsd and ntpd.

ntpshmmon will tell you if there is any data in SHM(0).  SHM1) will
never have data as you have no PPS.

RGDS
GARY
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Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
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