Domoticz

Hello,

I'm trying to use Domoticz on windows 7. I have to send an http request to a remote server and retrieve a temperature. I try to do this with a LUA script.
The command below doesn't send anything on ethernet (verified with wireshark):

temperature=os.execute('http://169.254.1.1/ forms.htm')

When i try this :

temperature=os.execute('start iexplore.exe "http://169.254.1.1/status.xml"')

the explorer open and I see the html page of the remote server so it's working but I want to retrieve the temperature without opening an explorer.

I've also tried to send "http://169.254.1.1/status.xml" on a switch action and I see with wireshark that the command is sent! but I cannot get the temperature from this action that's why I want to use a script.

I also try (and many other variant....):
os.execute('curl "http://169.254.1.1/status.xml"&')

but it doesn't work.

I've tried a lot of things but it does not work.

Please I somebody have a simple solution.

Thanks a lot

Regards.

Did you install curl?

Hello Egregius,

Thank you very much for your reply.

No I haven't install curl.

So I've install curl on my PC following some forum on web site. I've put curl.exe and ca-bundle.crt in window path folder: C\windows\system32.
I test directly by putting curl "http://169.254.1.1/status.xml" directly in command prompt and that's working: I see the GET command with wireshark.
But, when I try the same command in domoticz script : os.execute('curl..http://169.254.1.1/status.xml') it doesn't work.

I've also tried with a LUA editor and I've the same problem : I don't see any GET on Wireshark.

Where am I wrong?

Thanks you very much for your help.

Regards.

Don't know why it works in command prompt and not in lua. Maybe add complete paths?

Egregius,

it's working now! thank you. The problem was lua doesn't find curl.exe as I didn't put the directory in the windows environment variables...

So thanks for your help.

May I ask you other question?

Because Domoticz send a get, I see it with Wireshark and the remote server answer with the temperature, but I could not find a mean to retrieve the value sent by the remote server: I try:

- temperature=os.execute('curl "http://169.254.1.1/status.xml"')-> no sucess

I see on the web the there exist the os.capture command that could help me so I try

local cmd='curl.."http://169.254.1.1/status.xml"'
os.capture(cmd, true)

but it doesn't work, lua editor answer:

tack traceback:
[string "script_device_temperature.lua*"]:50: in main chunk

Is there a way (simple way) to get the temperature from os.execute('curl "http://169.254.1.1/status.xml"') ?

and I also try to update virtual sensor on domoticz with the command:

thank you very much.

Regards.

With php: yes, of course.
With lua: I have no clue at all.

Hello,
Finally thanks to forums I found a solution that I summarise below:

The function capture must be created in the script because it's not native in lua (copy from one forum):

function os.capture(cmd, raw)
local f = assert(io.popen(cmd, 'r'))
local s = assert(f:read('*a'))
f:close()
if raw then return s end
s = string.gsub(s, '^%s+', '')
s = string.gsub(s, '%s+$', '')
s = string.gsub(s, '[\n\r]+', ' ')
return s
end

Then when we put :

temperature=os.capture(cmd, true)

Temperature get the result with the tags, so it is necessary to remove the tags from the result, this is done via the following lua code from another forum (Hobbe & zzdomi):

local function extractElement1(tag, xml, default)
local pattern = "<"..tag..">(.-)</"..tag..">"
local result = (xml:match(pattern) or default)
return result
end
This function extract only the value between the tags.

And then it is necessary to update the virtual sensor with the following code:

commandArray[2]={['UpdateDevice']=idx..'|0|'..tostring(temperature)}

This is a bit complicated but domoticz get the result and display the temperature,

hope this summary be useful for others....

Thanks to Egregius, Hobbe, Alcor and zzdomi

Regards.

Sorry for a late posting...

Re...

But, when I try the same command in domoticz script : os.execute('curl..http://169.254.1.1/status.xml') it doesn't work.

I have exactly the same problem!
I've placed my curl folder here c:\curl\bin\curl.exe, and added this folder to system variables for both user and system PATH.
I can also see the GET command using Wireshark when using a windows 10 cmd window with...

curl http://192.168.1.154/control?cmd=PWM,4,500

and it does work with the ESPEasy E12 device as I can see the PWM change on my scope on pin 4 (GPI04/D2)
...but using folowing LUA code doesn't!
Anything else I need to check? Tried rebooting but think it's something to do with security, system variables etc.
Rob