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+--- Thread: NTP Server (/showthread.php?tid=2941)
NTP Server - Diggerz - 28.10.2020
Hi,
I have a project that will be using multiple LM's. Is it possible to select 1 LM as the time master and configure it as a NTP Server to server the other LM's? The LM's will be on an isolated network with no internet access. I had a look at the settings but was not sure if this is possible.
RE: NTP Server - Daniel - 28.10.2020
The Local server status is the NTP server you asking for. Enable it and in the other LMs put IP of the one with server enabled.
RE: NTP Server - admin - 28.10.2020
Keep in mind that you still need an accurate clock source. One solution is a GPS receiver with USB or RS232 interface if it's possible to get GPS coverage in your installation.
RE: NTP Server - Diggerz - 30.10.2020
Thanks the the replies, ill give the local server status a try, and look at installing a device to provide accurate time to the master LM
RE: NTP Server - fabiorusco - 17.12.2020
Hallo,
It's possible create a script for read the time from a ntp server when "wiser" it's restarted?
Best regards
Fabio Rusconi
RE: NTP Server - Erwin van der Zwart - 19.12.2020
You don’t need a script for that, when the NTP is enabled under the system settings it should sync time automatically, you need to be sure the controller has access to the internet and port 123 is not blocked by a firewall.
RE: NTP Server - fabiorusco - 19.12.2020
Thank you.
Best regards
Fabio
RE: NTP Server - Frank68 - 07.08.2025
(19.12.2020, 06:03)Erwin van der Zwart Wrote: You don’t need a script for that, when the NTP is enabled under the system settings it should sync time automatically, you need to be sure the controller has access to the internet and port 123 is not blocked by a firewall.Is the same on LM5 where find function to enable NTP?
Tank's
RE: NTP Server - admin - 07.08.2025
System config > Services > NTP client/server. It's enabled by default, but requires valid network gateway and DNS settings to work.
RE: NTP Server - ceddix - 17.09.2025
(28.10.2020, 08:20)admin Wrote: Keep in mind that you still need an accurate clock source. One solution is a GPS receiver with USB or RS232 interface if it's possible to get GPS coverage in your installation.
I have one of this,
https://www.electrokit.com/gps-mottagare-usb-dfrobot-tel0137?gad_source=1&gad_campaignid=17338847491&gbraid=0AAAAAD_OrGMA3KBzdISif1Ed7i3rT_Iz0&gclid=Cj0KCQjwuKnGBhD5ARIsAD19RsYPS3PrAVEPT8leWbkZMnDYrWDueUqXFKBCxDrt1LPalIQcWo2yAAsaAjAZEALw_wcB
Is it possible to connect this to usb, and get time and date?
I have a LM5 with no internet connection and want to sunrise/sunset function.
RE: NTP Server - admin - 23.09.2025
Connect it to LM and post what you get in System config > Status > System log.
RE: NTP Server - ceddix - 24.09.2025
Sep 23 11:40:42 LM_Vasbykyrka kern.info kernel: [11761.757200] cdc_acm 1-1:1.0: ttyACM0: USB ACM device
Sep 23 11:40:42 LM_Vasbykyrka kern.info kernel: [11761.753581] usb 1-1: Manufacturer: u-blox AG - www.u-blox.com
Sep 23 11:40:42 LM_Vasbykyrka kern.info kernel: [11761.753569] usb 1-1: Product: u-blox 7 - GPS/GNSS Receiver
Sep 23 11:40:42 LM_Vasbykyrka kern.info kernel: [11761.753557] usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=0
Sep 23 11:40:42 LM_Vasbykyrka kern.info kernel: [11761.753528] usb 1-1: New USB device found, idVendor=1546, idProduct=01a7, bcdDevice= 1.00
Sep 23 11:40:42 LM_Vasbykyrka kern.info kernel: [11761.591438] usb 1-1: new full-speed USB device number 2 using
That what it says.
RE: NTP Server - admin - 24.09.2025
Run this as a resident script and post what you get in LM Logs tab:
Code:
require('serial')
port = serial.open('/dev/ttyACM0')
port:flush()
buf = {}
while true do
char = port:read(1, 1)
if char then
if char == '\r' or char == '\n' then
if #buf > 0 then
line = table.concat(buf)
log(line)
buf = {}
end
else
buf[ #buf + 1 ] = char
end
end
endRE: NTP Server - ceddix - 25.09.2025
Hi,
test 25.09.2025 14:04:25
* string: $GPRMC,120428.00,V,,,,,,,250925,,,N*79
test 25.09.2025 14:04:25
* string: $GPVTG,,,,,,,,,N*30
test 25.09.2025 14:04:25
* string: $GPGGA,120428.00,,,,,0,00,99.99,,,,,,*6B
test 25.09.2025 14:04:25
* string: $GPGSA,A,1,,,,,,,,,,,,,99.99,99.99,99.99*30
test 25.09.2025 14:04:25
* string: $GPGSV,5,1,19,01,,,23,02,,,20,03,,,24,04,,,24*72
test 25.09.2025 14:04:25
* string: $GPGSV,5,2,19,05,,,22,06,,,25,08,,,22,15,,,23*7F
test 25.09.2025 14:04:25
* string: $GPGSV,5,3,19,16,,,22,18,,,25,19,,,22,20,,,22*74
test 25.09.2025 14:04:25
* string: $GPGSV,5,4,19,21,,,22,24,,,22,27,,,21,28,,,22*79
test 25.09.2025 14:04:25
* string: $GPGSV,5,5,19,30,,,23,31,,,17,32,,,24*70
test 25.09.2025 14:04:25
* string: $GPGLL,,,,,120428.00,V,N*47
RE: NTP Server - admin - 25.09.2025
The communication is working but there's no GPS signal detected. Try moving the receiver closer to a window and run the script again after some 30 minutes.
RE: NTP Server - ceddix - 01.10.2025
Hi,
Just testing it again and think the signal is right.
test 01.10.2025 13:36:35
* string: $GPRMC,113635.00,A,72184,N,29390,E,0.263,,011025,,,A*7D
There you have it. 11:36:35 2 hours wrong but think you can convert it, and then you have "011025" 1st october 2025.
How can I correct time and date from gps reciver to logicmachine?
RE: NTP Server - admin - 01.10.2025
Create a scheduled script that runs once per day during the night when there are no other scheduled scripts or tasks.
The supplied time is in UTC so make sure that LM has correct timezone set for the automatic conversion to work.
For testing purposes you can comment out os.sleep. It is needed so the script is not triggered again if the time is shifted.
Code:
os.sleep(30)
require('serial')
port = serial.open('/dev/ttyACM0')
if not port then
log('port not found')
return
end
port:flush()
function settime(line)
local parts = line:split(',')
if parts[1] ~= '$GPRMC' then
return
end
local hour, min, sec = string.match(parts[2] or '', '^(%d%d)(%d%d)(%d%d)%.')
local day, month, year = string.match(parts[10] or '', '^(%d%d)(%d%d)(%d%d)$')
if not hour or not day then
return
end
local cmd = string.format('date -u -s "20%s-%s-%s %s:%s:%s"; hwclock -w',
year, month, day, hour, min, sec)
os.execute(cmd)
return true
end
buf = {}
lines = 0
while true do
char = port:read(1, 1)
if char then
if char == '\r' or char == '\n' then
if #buf > 0 then
line = table.concat(buf)
lines = lines + 1
if settime(line) then
log('time updated')
break
elseif lines > 20 then
log('could not update time')
break
end
buf = {}
end
else
buf[ #buf + 1 ] = char
end
end
endRE: NTP Server - ceddix - 01.10.2025
Thanks, works perfect!