NTP - Revision history

JulienB: /* Time synchronisation from GPS */

2017-05-31T14:19:42Z

‎Time synchronisation from GPS

JulienB: add precision on where to do symbolic link for GPS

2017-03-29T15:17:26Z

add precision on where to do symbolic link for GPS

JulienB: Debian install

2017-03-29T14:06:43Z

Debian install

JulienB at 12:51, 29 March 2017

2017-03-29T12:51:26Z

JulienB: /* Time synchronisation from GPS */

2016-11-09T18:11:13Z

‎Time synchronisation from GPS

JulienB at 13:45, 19 September 2016

2016-09-19T13:45:50Z

JulienB: /* Get current Time from Internet */

2016-09-19T13:42:30Z

‎Get current Time from Internet

JulienB: Created page with "==Get current Time from Internet==

==Time synchronisation from GPS== * You will need the "real" NTP daemon, not the Busybox one. * Config file (''/e..."

2016-09-19T13:41:39Z

Created page with "==Get current Time from Internet== <pre class="apf"> </pre> ==Time synchronisation from GPS== * You will need the "real" NTP daemon, not the Busybox one. * Config file (''/e..."

New page

==Get current Time from Internet==
<pre class="apf">

</pre>

==Time synchronisation from GPS==
* You will need the "real" NTP daemon, not the Busybox one.
* Config file (''/etc/ntpd.conf''):
<pre class="apf">
# Allow only time queries, at a limited rate, sending KoD when in excess.
# Allow all local queries (IPv4, IPv6)
restrict default nomodify nopeer noquery limited kod
restrict 127.0.0.1
restrict [::1]

server 127.127.20.0 mode 17 minpoll 4 maxpoll 4 prefer
fudge 127.127.20.0 flag3 1 flag2 0 flag1 1 time1 0.0

</pre>
* ''127.127.20.0'' means: "use /dev/gps0 and parse it as NMEA to get time" (See [https://www.eecis.udel.edu/~mills/ntp/html/drivers/driver20.html]).
* ''mode 17'' is for 9600 bauds GPS providing GPRMC frames

* To create /dev/gpsX (GPS is connected to UART2):
<pre class="apf">
# ln -sf /dev/ttymxc1 /dev/gps0
</pre>

* To launch ntpd:
<pre class="apf">
# /usr/sbin/ntpd -g -c /etc/ntp.conf
</pre>

==Links==
* https://www.eecis.udel.edu/~mills/ntp/html/drivers/driver20.html

[[Category:Time]]
[[Category:NTP]]

@@ Line 20: / Line 20: @@
 |}
-* Edit config file (''/etc/ntp.conf''):
+* Edit/Replace config file (''/etc/ntp.conf'') with:
 <pre class="apf">
 # Allow only time queries, at a limited rate, sending KoD when in excess.

← Older revision		Revision as of 12:51, 29 March 2017
Line 39:		Line 39:
	[[Category:Time]]		[[Category:Time]]
	[[Category:NTP]]		[[Category:NTP]]
		+	[[Category:GPS]]

← Older revision		Revision as of 13:45, 19 September 2016
Line 1:		Line 1:
		+	From https://en.wikipedia.org/wiki/Network_Time_Protocol, ''"Network Time Protocol (NTP) is a networking protocol for clock synchronization between computer systems over packet-switched, variable-latency data networks."''
		+	Practically, it allows you to have current time/date on your APF even if your don't have an [[RTC]] (you will need an Internet connection or a GPS ;-)).
		+
	==Get current Time from Internet==		==Get current Time from Internet==
	<pre class="apf">		<pre class="apf">

@@ Line 40: / Line 40: @@
 </pre>
-* To launch ntpd:
+* You can add the previous in ntpd start script (''/etc/init.d/ntp''):
 <pre class="apf">
 # /usr/sbin/ntpd -g -c /etc/ntp.conf

@@ Line 8: / Line 8: @@
 ==Time synchronisation from GPS==
 * You will need the "real" NTP daemon, not the Busybox one.
 * Edit config file (''/etc/ntp.conf''):
 <pre class="apf">

@@ Line 9: / Line 9: @@
 ==Time synchronisation from GPS==
 * You will need the "real" NTP daemon, not the Busybox one.
-* Config file (''/etc/ntpd.conf''):
+* Edit config file (''/etc/ntp.conf''):
 <pre class="apf">
 # Allow only time queries, at a limited rate, sending KoD when in excess.
@@ Line 24: / Line 24: @@
 * ''mode 17'' is for 9600 bauds GPS providing GPRMC frames
-* To create /dev/gpsX (GPS is connected to UART2):
+* To create /dev/gpsX (here GPS is connected to UART2):
 <pre class="apf">
 # ln -sf /dev/ttymxc1 /dev/gps0

@@ Line 1: / Line 1: @@
 ==Get current Time from Internet==
 <pre class="apf">
+# ntpd -nqp 217.147.208.1
 </pre>