WAN IP Checker - Revision history

Walter vl at 19:53, 12 December 2025

2025-12-12T19:53:42Z

← Older revision		Revision as of 19:53, 12 December 2025
Line 11:		Line 11:
	There is a simple way to solve this: Install a small dzVents script on your system, that will automatically run periodically.		There is a simple way to solve this: Install a small dzVents script on your system, that will automatically run periodically.

	It will retrieve the external IP address and compare that to the address that was stored in the previous run. If they differ. it will ~~notify you and give you~~ the new IP address.		It will retrieve the external IP address and compare that to the address that was stored in the previous run. If they differ it will put the new IP address in the text device.

	~~The script below was tested on Raspberry Pi, running Jesse~~.

	'''Instructions'''		'''Instructions'''

	[[Dummy for virtual Switches\|Create a Dummy text device]] named ' Wan IP' and copy and paste the dzvents script in the internal [[EventSystem\|event editor]] as a dzvents script.		[[Dummy for virtual Switches\|Create a Dummy text device]] named ' Wan IP' and copy and paste the dzvents script in the internal [[EventSystem\|event editor]] as a dzvents script.


	'''The Script'''<syntaxhighlight lang="lua" line="1">		'''The Script'''<syntaxhighlight lang="lua" line="1">

Walter vl: /* Why do you need one? */

2024-12-10T22:38:12Z

Why do you need one?

@@ Line 1: / Line 1: @@
 == Why do you need one? ==
 Lots of people have experienced this: you are away from home, on a business trip or holidays, and your IP provider has given you a new external IP address. Lots of providers use dynamic IP, a static address is hard to come by.
 Unfortunately they don't tell you this in any way, but you find out the hard way: you can't get into your systems from remote.
-The script below was tested on Raspberry Pi, running Jesse.
+There are ways around this, for instance by using a DynDNS service. But if the only thing you want is to VPN into your network, this is overkill.
-All you need to do is change the name of your location and store the script in the directory domoticz\scripts\dzVents\scripts. That's it. By default it will run every four hours.
+There is a simple way to solve this: Install a small dzVents script on your system, that will automatically run periodically.
-Things to remember: make sure the notification scheme in Domoticz has been set up and tested. Also make sure the access to Domoticz is open from 127.0.0.1. If you don't use a userid/pw protection, you should be OK. If you do, make sure 127.0.0.1 is in the "Networks" field on the settings page.
+It will retrieve the external IP address and compare that to the address that was stored in the previous run. If they differ. it will notify you and give you the new IP address.
-== The script ==
+The script below was tested on Raspberry Pi, running Jesse.
-           level = domoticz.LOG_FORCE,
+'''Instructions'''
-local currIp = devIp.text -- get current WAN IP and store in a temp file
+[[Dummy for virtual Switches|Create a Dummy text device]] named ' Wan IP' and copy  and paste the dzvents script in the internal [[EventSystem|event editor]] as a dzvents script.
+'''The Script'''<syntaxhighlight lang="lua" line="1">
 local getIp    = 'https://api.ipify.org/?format=json'
 return {

Walter vl at 19:20, 9 December 2024

2024-12-09T19:20:55Z

Show changes

Walter vl at 19:13, 9 December 2024

2024-12-09T19:13:10Z

← Older revision		Revision as of 19:13, 9 December 2024
Line 85:		Line 85:
	UPDATE		UPDATE
	Looks like link no longer works... in the meantime dzVents evolved and now include async http requests so the script has beed updated:		Looks like link no longer works... in the meantime dzVents evolved and now include async http requests so the script has beed updated:
	~~<syntaxhighlight lang="lua">~~
	local getIp = 'https://api.ipify.org/?format=json'		local getIp = 'https://api.ipify.org/?format=json'

Line 121:		Line 121:
	end		end
	}		}
	~~</syntaxhighlight lang="lua">~~

Emme: /* The script */

2018-07-16T08:57:17Z

The script

New page

== Why do you need one? ==

Lots of people have experienced this: you are away from home, on a business trip or holidays, and your IP provider has given you a new external IP address. Lots of providers use dynamic IP, a static address is hard to come by.
Unfortunately they don't tell you this in any way, but you find out the hard way: you can't get into your systems from remote.
There are ways around this, for instance by using a DynDNS service. But if the only thing you want is to VPN into your network, this is overkill.
There is a simple way to solve this.
Install a small dzVents script on your system, that will automatically run periodically.
It will retrieve the external IP address and compare that to the address that was stored in the previous run. If they differ. it will notify you and give you the new IP address.

The script below was tested on Raspberry Pi, running Jesse.

All you need to do is change the name of your location and store the script in the directory domoticz\scripts\dzVents\scripts. That's it. By default it will run every four hours.
On the first run, it will discover that the text device used to "remember" the IP address does not exist. It will then create this device. In the next run, it will compare the actual IP address with the value in the text device (which will be something like "Hello World"), and find that it differs. You will be notified. Afyer this you will not see anything happening unless the external IP changes.

Things to remember: make sure the notification scheme in Domoticz has been set up and tested. Also make sure the access to Domoticz is open from 127.0.0.1. If you don't use a userid/pw protection, you should be OK. If you do, make sure 127.0.0.1 is in the "Networks" field on the settings page.

== The script ==

<syntaxhighlight lang="lua">
-- Based upon a script written by Emme (Milano, Italy)
-- Slightly modified and translated by Manjh
--
-- Store the script as GetWANIP.lua in domoticz/scripts/dzVents/scripts
--
-- Script will:
-- 1. retrieve current WN IP address
-- 2. compare to previous IP
-- 3. send warning msg if different
--
-- runs every four hours, but interval can be changed
--
-- during first run, will create text device.
-- Second run: will detect WAN IP for the first time
--

return {
on = {
timer = { 'every 4 hours' } -- ***** interval
},

logging = {
level = domoticz.LOG_FORCE,
marker = '[WAN IP Checker]'
},

execute = function(dz, devNil)
-- Change following field into your location
-- will be used to construct name of text variable, and also
-- in the subject of the warning e-mail when WAN IP address changes
local location = 'Utrecht'

local dzb = dz.LOG_FORCE
local getIp = 'curl -s https://4.ifcfg.me/' -- URL of website to echo my WAN IP
local tmpFile = '/home/pi/domoticz/scripts/wanip.txt' -- location where to store the temp file
local actIp = ''
local dev_name = location..'_WAN_IP_address'
if dz.devices(dev_name) == nil then
dz.log("Creating device: "..dev_name, dzb)
dz.openURL('127.0.0.1:8080/json.htm?type=createvirtualsensor&idx=1&sensorname='..dev_name..'&sensortype=5')
else
local devIp = dz.devices(dev_name)
local currIp = devIp.text
-- get current WAN IP and store in a temp file
os.execute(getIp..' > '..tmpFile)
actIp = io.open(tmpFile):read()
if actIp == nil then
actIp = 'Cannot retrieve WAN IP'
end
if actIp ~= currIp then
msgTxt = 'WAN IP has changed: '..currIp..' ==> '..actIp
dz.log(msgTxt, dzb)
dz.notify('WAN IP change warning '..location, msgTxt, dz.PRIORITY_EMERGENCY)
devIp.updateText(actIp)
os.execute('rm '..tmpFile)
else
dz.log('No change in WAN IP', dzb)
end
end
end
}
</syntaxhighlight lang="lua">

UPDATE
Looks like link no longer works... in the meantime dzVents evolved and now include async http requests so the script has beed updated:
<syntaxhighlight lang="lua">
local getIp = 'https://api.ipify.org/?format=json'

return {
on = {
timer = { 'every 6 hours' },
httpResponses = { 'wanIP' }
},

logging = {
level = domoticz.LOG_FORCE,
marker = '[WAN IP]'
},

execute = function(dz, devNil)
local actIP = dz.devices('Wan IP').text
local newIP = 'Unable to retrieve IP'

if (devNil.isTimer) then
dz.log("Send WanIP request")
dz.openURL({
url = getIp,
method = 'GET',
callback = 'wanIP'
})
elseif (devNil.isHTTPResponse) then
dz.log("WanIP response")
if (devNil.ok) then -- statusCode == 2xx
newIP = devNil.json.ip
end
if newIP ~= actIP then
dz.devices('Wan IP').updateText(newIP)
end
end
end
}
</syntaxhighlight lang="lua">