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Re: Ubuntu 18.04.3 build from source testing


From: Steve Bourland
Subject: Re: Ubuntu 18.04.3 build from source testing
Date: Mon, 16 Dec 2019 18:26:53 -0600 (CST)
User-agent: Alpine 2.21 (DEB 202 2017-01-01)

Yo Gary!

Looking fairly good. Clean install, installed the packages I thought I'd need, scons and scons check both passed first go with new tarball, and gpspipe -r is reporting:

$GPRMC,000732.00,A,2926.7338,N,09836.3886,W,0.1346,81.872,171219,4.1,E*41

which looks correct. There is perhaps a 1 second deviation vs. ntp, not sure. That's where things are off the rails, have installed the ntpsec package for Ubuntu server, but gpsd and ntpd don't seem to want to talk to each other. Also had this at gpsd startup:

gpsd:WARN: KPPS:/dev/ttyS0 kernel PPS unavailable, PPS accuracy will suffer

Assume I need to install a PPS package at some point, but that shouldn't prevent ntpd and gpsd from talking to each other.

Historically I have had to issue an stty command to set the serial line speed to get the PPS signal to hit, but that hasn't helped here. I'm sort of at a loss, here are the lines from my ntp.conf file:
# gpsd time source
server 127.127.28.0
# With time1 0.420 saw ~-200 msec offset, really just punting here
fudge 127.127.28.0 time1 0.220 refid NMEA
server 127.127.28.1 prefer
fudge 127.127.28.1 time1 0.0002 refid PPS

Not sure if you have any pointers here.
                                        Thanks,
                                          Steve



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