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Re: [gpsd-users] [gpsd newbie] Wrong time using Ublox
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From: |
Gary E. Miller |
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Subject: |
Re: [gpsd-users] [gpsd newbie] Wrong time using Ublox |
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Date: |
Tue, 15 Mar 2022 12:14:22 -0700 |
Yo Michele!
On Tue, 15 Mar 2022 17:08:56 +0100
"Bertoni, Michele" <mbertoni@inogs.it> wrote:
> Hi to all!
Welcome.
> I'm a newbie using gpsd: I need to create ntp server due I have no
> access to internet and I need my devices to be synced.
A common task. Have you read the Intro to time service:
https://gpsd.io/time-service-intro.html
And GPS Time Service hwoto?
https://gpsd.io/gpsd-time-service-howto.html
> I'm using Raspberry pi so is not so easy get updated guide
> step-by-step to creating ntp server....
See above, and many more.
> gpsd: 3.22 (revision 3.22)
Version 3.23 is current. Please update.
> I get NMEA string, I get PPS, I also get wrong time:
More details...
> on my devices
> (Raspberry pi) I set at boot date of 1 Jan 2000,
Why would you ever do that????
> then I start
> manual-periodic syncing using ntpdate,
How do you do that? Why not just run ntpd?
> then I check date.
> Sometimes I get synced date at 1970 (or 1980, I don't remember),
Details please. What version and flavor of NTP?
> actually I use other ntp clients (such MikroTik routers) to check
> date. I'm using https://www.timeanddate.com/worldclock/timezone/utc as
> comparison.
How bout you jsut check the newspaper?
> website: date year 2022, vs. MikroTik date year 1970 (sometimes) even
> if date at boot is set to 2000
Can't help you here with MicroTik.
> So when I get time I have no idea if time is correct.
Look at your cell phone?
> I remember on Ublox datasheet there are some flags in NAV_TIMEGPS,
> time is not valid until flags get 0x07 value, so time I read is wrong
> by some seconds (maybe leap seconds?)....
gpsd handles all that. And gpsd has nothing at all to do with ntpdate.
How are you running gpsd? Do you have a good fix? How are you running
ntpd? What is you /etc/ntp.conf?
> It looks like gpsd gets wrong time from GPS.....
Extemely unlikely with a u-blox 8.
RGDS
GARY
---------------------------------------------------------------------------
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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"If you can't measure it, you can't improve it." - Lord Kelvin
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