Hi all,
I've been battling for some time with getting ntpd to set the date/time
from gpsd's shared memory locations. My GPS device is on the network
and sends GPS messages every minute over UDP. This is picked up by gpsd
and it appears I get a good fix with all the required data. It also
looks as if the shared memory locations are being set up correctly. But
whatever I do, ntpd time source "reach" stubbornly remains at zero,
even when running ntpd as root. I would be most grateful if someone
could cast their eyes on the configurations and log output below, and
let me know if you can see were it's going wrong!
P.S. This has been cross-posted from gpsd-us...@nongnu.org, where I
failed to get any response to my query.
# syslog gpsd startup:
Aug 6 19:28:16 computer gpsd[374]: gpsd:INFO: launching (Version 3.11)
Aug 6 19:28:16 computer gpsd[374]: gpsd:INFO: listening on port gpsd
Aug 6 19:28:16 computer gpsd[374]: gpsd:PROG: NTPD shmat(0,0,0) succeeded,
segment 0
Aug 6 19:28:16 computer gpsd[374]: gpsd:PROG: NTPD shmat(32769,0,0) succeeded,
segment 1
Aug 6 19:28:16 computer gpsd[374]: gpsd:PROG: NTPD shmat(65538,0,0) succeeded,
segment 2
Aug 6 19:28:16 computer gpsd[374]: gpsd:PROG: NTPD shmat(98307,0,0) succeeded,
segment 3
Aug 6 19:28:16 computer gpsd[374]: gpsd:PROG: successfully connected to the
DBUS system bus
Aug 6 19:28:16 computer gpsd[374]: gpsd:PROG: shmat() succeeded, segment 131076
Aug 6 19:28:16 computer gpsd[374]: gpsd:PROG: shared-segment creation
succeeded,
Aug 6 19:28:16 computer gpsd[374]: gpsd:INFO: stashing device
udp://192.168.13.100:10110 at slot 0
Aug 6 19:28:16 computer gpsd[374]: gpsd:INFO: opening UDP feed at
192.168.13.100, port 10110.
Aug 6 19:28:16 computer gpsd[374]: gpsd:ERROR: UDP device open error can't
connect to host/port pair.
Aug 6 19:28:16 computer gpsd[374]: gpsd:ERROR: initial GPS device
udp://192.168.13.100:10110 open failed
Aug 6 19:28:16 computer gpsd[374]: gpsd:INFO: running with effective group ID
20
Aug 6 19:28:16 computer gpsd[374]: gpsd:INFO: running with effective user ID
110
Aug 6 19:28:16 computer gpsd[374]: gpsd:INFO: startup at
2017-08-06T19:28:16.000Z (1502047696)
# syslog ntpd startup:
Aug 6 19:28:24 computer ntpd[609]: ntpd 4.2.6p5@1.2349-o Mon Jul 25 22:35:28
UTC 2016 (1)
Aug 6 19:28:24 computer ntp[582]: Starting NTP server: ntpd.
Aug 6 19:28:24 computer ntpd[652]: proto: precision = 0.781 usec
Aug 6 19:28:24 computer ntpd[652]: Listen and drop on 0 v4wildcard 0.0.0.0 UDP
123
Aug 6 19:28:24 computer systemd[1]: Started LSB: Start NTP daemon.
Aug 6 19:28:25 computer ntpd[652]: Listen and drop on 1 v6wildcard :: UDP 123
Aug 6 19:28:25 computer ntpd[652]: Listen normally on 2 lo 127.0.0.1 UDP 123
Aug 6 19:28:25 computer ntpd[652]: Listen normally on 3 eth0 192.168.13.100
UDP 123
Aug 6 19:28:25 computer ntpd[652]: Listen normally on 4 lo ::1 UDP 123
Aug 6 19:28:25 computer ntpd[652]: Listen normally on 5 eth0
fe80::6a89:f1d3:7ec0:510 UDP 123
Aug 6 19:28:25 computer ntpd[652]: peers refreshed
Aug 6 19:28:25 computer ntpd[652]: Listening on routing socket on fd #22 for
interface updates
# syslog gpsd sample:
Aug 6 19:56:42 computer gpsd[374]: gpsd:IO: <= GPS:
$GPGGA,185748.0,1234.567890,N,00012.345678,E,1,10,0.9,13.6,M,47.0,M,,*6B
Aug 6 19:56:42 computer gpsd[374]: gpsd:PROG: GPGGA sentence timestamped
185748.00.
Aug 6 19:56:42 computer gpsd[374]: gpsd:PROG: GPGGA starts a reporting cycle.
Aug 6 19:56:42 computer gpsd[374]: gpsd:IO: <= GPS:
$GPRMC,185748.0,A,1234.567890,N,00012.345678,E,0.0,,060817,0.0,E,A*2B
Aug 6 19:56:42 computer gpsd[374]: gpsd:PROG: GPRMC sentence timestamped
185748.00.
Aug 6 19:56:42 computer gpsd[374]: gpsd:PROG: GPRMC ends a reporting cycle.
Aug 6 19:56:42 computer gpsd[374]: gpsd:IO: <= GPS:
$GPVTG,,T,0.0,M,0.0,N,0.0,K,A*0D
Aug 6 19:56:42 computer gpsd[374]: gpsd:IO: <= GPS:
$GPGSA,A,2,01,03,06,09,11,17,19,22,23,31,,,1.2,0.9,0.8*31
Aug 6 19:56:42 computer gpsd[374]: gpsd:PROG: GPGSA sets mode 2
Aug 6 19:56:42 computer gpsd[374]: gpsd:IO: <= GPS:
$GPGSV,4,1,13,01,31,136,41,03,67,068,35,06,32,303,31,09,34,202,41*78
Aug 6 19:56:42 computer gpsd[374]: gpsd:PROG: Partial satellite data (1 of 4).
Aug 6 19:56:42 computer gpsd[374]: gpsd:IO: <= GPS:
$GPGSV,4,2,13,11,09,153,39,17,40,243,40,19,42,272,30,22,42,082,40*78
Aug 6 19:56:42 computer gpsd[374]: gpsd:PROG: Partial satellite data (2 of 4).
Aug 6 19:56:42 computer gpsd[374]: gpsd:IO: <= GPS:
$GPGSV,4,3,13,23,61,174,46,31,19,047,36,12,04,329,,14,00,039,*76
Aug 6 19:56:42 computer gpsd[374]: gpsd:PROG: Partial satellite data (3 of 4).
Aug 6 19:56:42 computer gpsd[374]: gpsd:IO: <= GPS: $GPGSV,4,4,13,25,01,001,*4C
# /etc/default/gpsd
START_DAEMON="true"
USBAUTO="false"
DEVICES="udp://192.168.13.100:10110"
GPSD_OPTIONS="-n -D5"
# ntpd.conf:
GPS Serial data reference (NTP0)
server 127.127.28.0 minpoll 4 maxpoll 4 prefer
fudge 127.127.28.0 time1 0.0 refid GPS
GPS PPS reference (NTP1)
server
