Re: [gpsd-users] syslog error message with new version - kernel PPS failed Connection timed out

[hans mayer]

hi gary,

thanks for your answer. sorry for my late reply.

> The RasPi takes some extra configuration to get right.  Be sure to 
read the gpsd specific doc on the RasPi.

can you point me to an URL ?
or some details for what i should search ?

> Your PPS is not as good as it needs to be.  No RFC 2783 support.  Are
you getting any PPS at all?

i think so.
for NTP i run rpi_gpio_ntp -N 1 -g 18
and ntp sync's very well
+127.127.28.0    .GPS.   0 l    7   16  377    0.000   -1.955   1.171
*127.127.28.1    .PPS.   0 l   38   64  377    0.000    0.017   0.008

offset in peerstats for 127.127.28.1 is typical below 20 micro seconds
i wrote a shell/awk/gnuplot script which shows this as graph very well.

> Yeah, you need too fix your KPPS.

how ?
as i wrote, originally i used for gpsd version 3.6
with version 3.6 there are no errors in the syslog.
these messages came with version 3.15

when i reboot the banana pi i see in the kernel log like this:
gps0 kernel: [   10.724635] pps_core: LinuxPPS API ver. 1 registered
gps0 kernel: [   10.745687] pps_core: Software ver. 5.3.6 - Copyright 
2005-2007 Rodolfo Giometti <address@hidden>
gps0 kernel: [   20.286845] pps_ldisc: PPS line discipline registered
gps0 kernel: [   20.291317] pps pps0: new PPS source serial2
gps0 kernel: [   20.294876] pps pps0: source "/dev/ttyS2" added

it's armv7l GNU/Linux version 3.4.103

do you have any further tips for me ?


kind regards
hans

--



Am 06.07.2015 19:29, schrieb Gary E. Miller:
> Yo hans!
>
> On Thu, 02 Jul 2015 14:58:59 +0200
> hans mayer <address@hidden> wrote:
>
> > my environment: i am testing 2 banana pi with raspbian os.
> > these servers should be used as ntp server.
>
> The RasPi takes seom etra configuration to get right.  Be sure to read
> the gpsd specific doc on the RasPi.
>
> > but i see also the following in the syslog:
> > Jul  1 23:42:42 gps0 gpsd[2195]: gpsd:ERROR: KPPS:/dev/ttyS2 kernel
> > PPS failed Connection timed out
> > Jul  1 23:42:45 gps0 gpsd[2195]: gpsd:ERROR: KPPS:/dev/ttyS2 kernel
> > PPS failed Connection timed out
> > Jul  1 23:42:48 gps0 gpsd[2195]: gpsd:ERROR: KPPS:/dev/ttyS2 kernel
> > PPS failed Connection timed out
>
> Your PPS is not as good as it needs to be.  No RFC 2783 support.  Are
> you getting any PPS at all?
>
> > reading http://www.catb.org/gpsd/installation.html
> > i see it falls back to user ID nobody.
> > for my opinion it has not enough privileges. maybe the old version
> > had a different behavior.
>
> KPPS is opened before dropping privs.
>
> > is there a way to force this daemon to run as root ?
>
> No need, just start as root.
>
> > this error msg is not nice and it fills up the syslog.
>
> Yeah, you need too fix your KPPS.
>
> > The interesting thing, ntp is still working perfectly accurate.
>
> How do you know?  Without KPPS you are losing precision.
>
> RGDS
> GARY
> ---------------------------------------------------------------------------
> Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
>         address@hidden  Tel:+1(541)382-8588