Re: [chrony-users] Help Chrony synchronization(connectivity) is lost after 10 to 15 minutes.

[Munsif ALI <munsifali_ali@xxxxxxxxxxx>]

Miroslav lichvar thanks for the reponse.

I don't think it is a firmware bug in GPS because I have made a little program(using c++ language) which is receiving SIGIO signal via serial port and it continuously receiving  GPS and PPS data.

I have installed pps-tool, when I run ppstest /dev/pps0 command it is fetching data for 2 mints and after that  pps0 says connection time out error.

I don't know the actual problem why ppstest /dev/pps0 command stop receiving PPS data while I am receiving SIGIO pulse in my program ?

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From: Miroslav Lichvar <mlichvar@xxxxxxxxxx>
Sent: Monday, October 8, 2018 3:44:11 PM
To: chrony-users@xxxxxxxxxxxxxxxxxxxx
Subject: Re: [chrony-users] Help Chrony synchronization(connectivity) is lost after 10 to 15 minutes.

 

On Mon, Oct 08, 2018 at 09:51:17AM +0000, Munsif ALI wrote:
> After 10 mints. The refclock log  shows following output:
> 2018-10-08 09:32:32.375898 NEMA    0 N 0 -3.758982e-01 -3.758982e-01  1.000e-06
> 2018-10-08 09:32:33.000070 PPS     0 N 0 -6.974900e-05 -6.974948e-05  1.000e-09
> 2018-10-08 09:32:33.352441 NEMA    1 N 0 -3.524413e-01 -3.524413e-01  1.000e-06
> 2018-10-08 09:32:34.000011 PPS     1 N 0 -1.115700e-05 -1.115749e-05  1.000e-09
> 2018-10-08 09:33:25.828062 NEMA    6 N 0  5.199121e+04  5.199121e+04  1.000e-06
> 2018-10-08 09:33:26.819088 NEMA    7 N 0  5.199122e+04  5.199122e+04  1.000e-06

This is very strange. It looks like the time reported by the GPS
is suddenly off by ~14.4 hours.

> 2018-10-08 09:33:42.829835 NEMA    7 N 0  5.199121e+04  5.199121e+04  1.000e-06
> 2018-10-08 09:33:44.832557 NEMA    9 N 0  8.639983e+04  8.639983e+04  1.000e-06

And here it is almost exactly 24 hours off.

I think that indicates a firmware bug in the GPS. Is there a firmware
update you could apply?

I'd suggest to ask on the gpsd-users mailing lists and see if anyone
has experience with this device.

--
Miroslav Lichvar

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