TCP Socket Connection for Legrand

[savaskorkmaz]

Hi,

We have Legrand system that we can send commands via TCP Socket. 

IP Address : 192.168.161
Port : 20000
Password : 12345 

On Command : *1*1*11##
Off Command : *1*0*11##

I tried to use some TCP socket examples in here but i failed. Can you help me for script regarding to information above.

[Daniel]

Do you have some description the legrand interface?

[savaskorkmaz]

Hi,
We connected via f455 Legrand IP interface.
We used some Legrand softwares called Scenarx. https://www.myhome-project.it/software/scenarx
Via this software, we send Light on Command *1*1*11## and Light Off Command *1*0*11## and communicatin is worked.
Legrand system send commands via Open WebNet protocol based on TCP Socket communication.
There are open resources for openwebnet in here https://github.com/openwebnet . One is Java Client. You can see the communication example via Java.
One of the our competitor in this project make connection with this Java Client example. But we want to use LM and Luascript. We heard that our competitor just send simple tcp socket commands but via Java.
Regards,

[admin]

At least try connecting via telnet using Putty or similar client from your PC. Since there's a password specified some extra protocol implementation is required.

[savaskorkmaz]

Hi there ,
I will try. But if there is no password, can you write a simple script which connect to 192.168.161 address and 20000 port then it will send *1*1*11## code if the value is true.
Regards,

[admin]

Maybe you are missing additional \r\n after the command?

[savaskorkmaz]

Hi,
You can find some videos with putty connection.

https://www.youtube.com/watch?v=O2d_abVaqe0
https://www.youtube.com/watch?v=qDQftLB25Hc

---

Can you write an example script considering there is no password .
Regards,

[admin]

This is not a proper protocol implementation, but see if this works for you:

Code:

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function openwebnetcmd(ip, cmd)   local socket = require('socket')   local eot = string.char(4)   local sock = socket.tcp()   sock:settimeout(1)   local res, err = sock:connect(ip, 20000)   if not res then     alert('connect failed ' .. tostring(err))     return   end   os.sleep(1)   sock:send('*99*0##' .. eot)   os.sleep(1)   sock:send(cmd .. eot)   os.sleep(1)   sock:close()   return true end openwebnetcmd('192.168.1.1', '*1*1*11##')

[savaskorkmaz]

Hi,

With a little change, it worked well.
Thank you very much.

[savaskorkmaz]

Hello,
As I said before above, sending command is working. Now I need to listen status information. For getting status,
I send *99*1## command first ,
Then I send *1*11## command. It means, I request status information for light address 11.
In putty, we get information like *1*1*11## .
In logic machine, how can i write this feedback in to a variable (Like value ) in script.

Regards,

[a455115]

Hi,

With a little change, it worked well.
Thank you very much.

Hello,

Would you share the changes to the script and how you tied it to a password?

Thanks in advance!

[admin]

The password algorithm differs between gateways. Which one are you using?

[a455115]

The password algorithm differs between gateways. Which one are you using?

Gateway is MH200N

[admin]

Try this, change PASS and IP as needed. The script handles the authentication part, after that you can issue commands, read status info etc.

Code:

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function calcpass(pass, nonce)   local flag = true   local num1 = 0   local num2 = 0   local password = tonumber(pass, 10)   for i = 1, #nonce do     local c = nonce:sub(i, i)     if c ~= '0' then       if flag then         num2 = password       end       flag = false     end     if c == '1' then       num1 = bit.band(num2, 0xFFFFFF80)       num1 = bit.rshift(num1, 7)       num2 = bit.lshift(num2, 25)       num1 = num1 + num2     elseif c == '2' then       num1 = bit.band(num2, 0xFFFFFFF0)       num1 = bit.rshift(num1, 4)       num2 = bit.lshift(num2, 28)       num1 = num1 + num2     elseif c == '3' then       num1 = bit.band(num2, 0xFFFFFFF8)       num1 = bit.rshift(num1, 3)       num2 = bit.lshift(num2, 29)       num1 = num1 + num2     elseif c == '4' then       num1 = bit.lshift(num2, 1)       num2 = bit.rshift(num2, 31)       num1 = num1 + num2     elseif c == '5' then       num1 = bit.lshift(num2, 5)       num2 = bit.rshift(num2, 27)       num1 = num1 + num2     elseif c == '6' then       num1 = bit.lshift(num2, 12)       num2 = bit.rshift(num2, 20)       num1 = num1 + num2     elseif c == '7' then       num1 = bit.band(num2, 0x0000FF00)       num1 = num1 + bit.lshift(bit.band(num2, 0x000000FF), 24)       num1 = num1 + bit.rshift(bit.band(num2, 0x00FF0000), 16)       num2 = bit.rshift(bit.band(num2, 0xFF000000), 8)       num1 = num1 + num2     elseif c == '8' then       num1 = bit.band(num2, 0x0000FFFF)       num1 = bit.lshift(num1, 16)       num1 = num1 + bit.rshift(num2, 24)       num2 = bit.band(num2, 0x00FF0000)       num2 = bit.rshift(num2, 8)       num1 = num1 + num2     elseif c == '9' then       num1 = bit.bnot(num2)     elseif c == '0' then       num1 = num2     end     num2 = num1   end   if num1 < 0 then     num1 = num1 + 4294967296   end   return tostring(num1) end function read(sock)   local buf = {}   while true do     local ch, err = sock:receive(1)     if ch then       local pr = buf[ #buf ]       buf[ #buf + 1 ] = ch       if ch == '#' and pr == '#' then         break       end     else       return nil, err     end   end   return table.concat(buf) end ACK = '*#*1##' NACK = '*#*0##' OPEN = '*99*0##' PASS = '12345' IP = '127.0.0.1' PORT = 20000 function openwebnetinit()   local sock = require('socket').tcp()   local res, err   sock:settimeout(1)   res, err = sock:connect(IP, PORT)   if not res then     alert('connect failed ' .. tostring(err))     return   end   res, err = read(sock)   if res ~= ACK then     alert('no initial ack ' .. tostring(res or err))     return   end   sock:send(OPEN)   res, err = read(sock)   if not res then     alert('no nonce ' .. tostring(err))     return   end   local nonce = res:match('%d+')   local pass = calcpass(PASS, nonce)   sock:send('*#' .. pass .. '##')   res, err = read(sock)   if res ~= ACK then     alert('auth failed ' .. tostring(res or err))     return   end   return sock end sock = openwebnetinit() if sock then   alert('connection ok')   -- do something here   sock:close() end

[a455115]

Thank you very much for the answer and the example! I will try it on Saturday and give feedback.

[a455115]

Try this, change PASS and IP as needed. The script handles the authentication part, after that you can issue commands, read status info etc.

Code:

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function calcpass(pass, nonce)   local flag = true   local num1 = 0   local num2 = 0   local password = tonumber(pass, 10)   for i = 1, #nonce do     local c = nonce:sub(i, i)     if c ~= '0' then       if flag then         num2 = password       end       flag = false     end     if c == '1' then       num1 = bit.band(num2, 0xFFFFFF80)       num1 = bit.rshift(num1, 7)       num2 = bit.lshift(num2, 25)       num1 = num1 + num2     elseif c == '2' then       num1 = bit.band(num2, 0xFFFFFFF0)       num1 = bit.rshift(num1, 4)       num2 = bit.lshift(num2, 28)       num1 = num1 + num2     elseif c == '3' then       num1 = bit.band(num2, 0xFFFFFFF8)       num1 = bit.rshift(num1, 3)       num2 = bit.lshift(num2, 29)       num1 = num1 + num2     elseif c == '4' then       num1 = bit.lshift(num2, 1)       num2 = bit.rshift(num2, 31)       num1 = num1 + num2     elseif c == '5' then       num1 = bit.lshift(num2, 5)       num2 = bit.rshift(num2, 27)       num1 = num1 + num2     elseif c == '6' then       num1 = bit.lshift(num2, 12)       num2 = bit.rshift(num2, 20)       num1 = num1 + num2     elseif c == '7' then       num1 = bit.band(num2, 0x0000FF00)       num1 = num1 + bit.lshift(bit.band(num2, 0x000000FF), 24)       num1 = num1 + bit.rshift(bit.band(num2, 0x00FF0000), 16)       num2 = bit.rshift(bit.band(num2, 0xFF000000), 8)       num1 = num1 + num2     elseif c == '8' then       num1 = bit.band(num2, 0x0000FFFF)       num1 = bit.lshift(num1, 16)       num1 = num1 + bit.rshift(num2, 24)       num2 = bit.band(num2, 0x00FF0000)       num2 = bit.rshift(num2, 8)       num1 = num1 + num2     elseif c == '9' then       num1 = bit.bnot(num2)     elseif c == '0' then       num1 = num2     end     num2 = num1   end   if num1 < 0 then     num1 = num1 + 4294967296   end   return tostring(num1) end function read(sock)   local buf = {}   while true do     local ch, err = sock:receive(1)     if ch then       local pr = buf[ #buf ]       buf[ #buf + 1 ] = ch       if ch == '#' and pr == '#' then         break       end     else       return nil, err     end   end   return table.concat(buf) end ACK = '*#*1##' NACK = '*#*0##' OPEN = '*99*0##' PASS = '12345' IP = '127.0.0.1' PORT = 20000 function openwebnetinit()   local sock = require('socket').tcp()   local res, err   sock:settimeout(1)   res, err = sock:connect(IP, PORT)   if not res then     alert('connect failed ' .. tostring(err))     return   end   res, err = read(sock)   if res ~= ACK then     alert('no initial ack ' .. tostring(res or err))     return   end   sock:send(OPEN)   res, err = read(sock)   if not res then     alert('no nonce ' .. tostring(err))     return   end   local nonce = res:match('%d+')   local pass = calcpass(PASS, nonce)   sock:send('*#' .. pass .. '##')   res, err = read(sock)   if res ~= ACK then     alert('auth failed ' .. tostring(res or err))     return   end   return sock end sock = openwebnetinit() if sock then   alert('connection ok')   -- do something here   sock:close() end

I get this as errors:

AS 15.04.2022 22:59:11
Resident script:19: bad argument #1 to 'band' (number expected, got nil)
stack traceback:
[C]: in function 'band'
Resident script:19: in function 'calcpass'
Resident script:132: in function 'openwebnetinit'

AS 15.04.2022 22:59:21
Resident script:19: bad argument #1 to 'band' (number expected, got nil)
stack traceback:
[C]: in function 'band'
Resident script:19: in function 'calcpass'
Resident script:132: in function 'openwebnetinit'

AS 15.04.2022 22:59:32
Resident script:19: bad argument #1 to 'band' (number expected, got nil)
stack traceback:
[C]: in function 'band'
Resident script:19: in function 'calcpass'
Resident script:132: in function 'openwebnetinit'

AS 15.04.2022 22:59:45
Resident script:19: bad argument #1 to 'band' (number expected, got nil)
stack traceback:
[C]: in function 'band'
Resident script:19: in function 'calcpass'
Resident script:132: in function 'openwebnetinit'

AS 15.04.2022 22:59:58
Resident script:19: bad argument #1 to 'band' (number expected, got nil)
stack traceback:
[C]: in function 'band'
Resident script:19: in function 'calcpass'
Resident script:132: in function 'openwebnetinit'

[a455115]

What I managed to do so far is to redirect the data from MH200 to LM without a password, because obviously the error in the script is from the password. I'm trying to read what's going on the line using the first code, but to no avail. How do I make the codes coming out of the MH200N visible in the console and be able to associate them with virtual objects?

[admin]

Start by logging what data the gateway is sending. Modify read function like this:

Code:

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function read(sock)   local buf = {}   while true do     local ch, err = sock:receive(1)     if ch then       local pr = buf[ #buf ]       buf[ #buf + 1 ] = ch       if ch == '#' and pr == '#' then         break       end     else       return nil, err     end   end   local ret = table.concat(buf)   log(ret)   return ret end

For an event session you need to change OPEN command to *99*1##

[a455115]

Code:

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function read(sock)   local buf = {}   while true do     local ch, err = sock:receive(1)     if ch then       local pr = buf[ #buf ]       buf[ #buf + 1 ] = ch       if ch == '#' and pr == '#' then         break       end     else       return nil, err     end   end   local ret = table.concat(buf)   log(ret)   return ret end ACK = '*#*1##' NACK = '*#*0##' OPEN = '*99*1##' function openwebnetinit()   local socket = require('socket')     local sock = socket.tcp() sock:settimeout(1)    local res, err = socket.connect('192.168.1.247', 20000)   if not res then     alert('connect failed ' .. tostring(err))     return   end   res, err = read(sock)   if res ~= ACK then     alert('no initial ack ' .. tostring(res or err))     return   end   sock:send(OPEN)   res, err = read(sock)   if not res then     alert('no nonce ' .. tostring(err))     return   end   local nonce = res:match('%d+')   res, err = read(sock)   if res ~= ACK then     alert('auth failed ' .. tostring(res or err))     return   end   return sock end sock = openwebnetinit() if sock then   alert('connection ok')   -- do something here   sock:close() end

Code:

12345

Resident script:5: calling 'receive' on bad self (tcp{client} expected, got userdata) stack traceback: [C]: in function 'receive' Resident script:5: in function 'read' Resident script:43: in function 'openwebnetinit'

Apparently I'm confusing something general?

[admin]

Line 37 is incorrect:

Code:

1

local res, err = socket.connect('192.168.1.247', 20000)

It should be:

Code:

1

local res, err = sock:connect('192.168.1.247', 20000)