I realize that the standard advice, for good reason, is to use a
computer with a battery-backed RTC. However, for those not doing that,
there is an alternative, which is to wait for NTP to be happily synced.
I have tested this somewhat, and am unsure if there is a window when NTP
syncs and realizes it is far off and then adjusts, so perhaps the "are
things ok" logic should be better. But I send my script anyway in case
it helps someone, or someone can point out why this is confused.
On booting a RPI3 with the wifi wedged (not a weewx issue) and leaving
it for hours, and then making the network work, I had log lines that
looked like:
UNSYNC 127.0.0.1: stratum 16, offset 0.000000, synch distance 0.000000
UNSYNC 127.0.0.1: stratum 16, offset 0.000000, synch distance 0.000000
UNSYNC 127.0.0.1: stratum 16, offset 0.000000, synch distance 0.000000
UNSYNC 127.0.0.1: stratum 16, offset 0.000000, synch distance 0.000000
UNSYNC 127.0.0.1: stratum 16, offset 0.000000, synch distance 0.000000
UNSYNC 127.0.0.1: stratum 16, offset 0.000000, synch distance 0.000000
OK 127.0.0.1: stratum 3, offset -0.002891, synch distance 0.042083
Thu Apr 18 15:55:19 EDT 2019
associd=0 status=0618 leap_none, sync_ntp, 1 event, no_sys_peer,
system peer: 173.0.156.209:123
system peer mode: client
leap indicator: 00
stratum: 3
log2 precision: -19
root delay: 84.166
root dispersion: 998.679
reference ID: 173.0.156.209
reference time: e06354a6.4182be99 Thu, Apr 18 2019 15:55:18.255
system jitter: 8.636792
clock jitter: 0.965
clock wander: 0.000
broadcast delay: -50.000
symm. auth. delay: 0.000
remote refid st t when poll reach delay offset jitter
==============================================================================
[redacted addrs ] 3 s - 64 17 23.996 -1.688 5.556
[ ] 2 u 1 64 11 95.937 1.922 0.592
-[ ] 2 u 7 64 17 224.692 -10.475 1.508
[ ] 2 u 1 64 17 84.169 0.769 0.497
+[ ] 2 u 6 64 17 50.154 -2.841 1.415
*[ ] 2 s 3 64 17 26.173 -1.535 1.971
[ ] 3 s - 64 17 6.780 0.245 0.657
+[ ] 3 s 9 64 17 27.120 2.948 1.018
In this case the time was very close because the system had just done a
quick reboot, so it was only 45s slow or something like that.
The script:
----------------------------------------
#!/bin/sh
date
ntpq -c sysinfo
ntpq -pn
while sleep 5; do
trace=`ntptrace -n | head -1`
stratum=`echo $trace | sed -e 's/.*stratum \([0-9]*\),.*/\1/'`
if [ "$stratum" -lt 16 ]; then
echo OK $trace
break;
fi
echo UNSYNC $trace
done
date
ntpq -c sysinfo
ntpq -pn
bin/weewxd weewx.conf
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