TCP Socket Connection for Legrand

[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:

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'