Art-Net DMX

[tomnord]

Try this:

Code:

if not server then
  mapping = {
    [1] = '32/1/1',
    [2] = '32/1/2',
    [3] = '32/1/3',
  }

  server = require('socket').udp()
  server:settimeout(1)
  server:setsockname('*', 0x1936)

  header = 'Art-Net' .. string.char(0, 0, 0x50)
  values = {}

  function parse(data)
    local count, value

    if #data < 19 or data:sub(1, #header) ~= header then
      return
    end

    local univlo, univhi = data:byte(15, 16)
    local universe = univhi * 256 + univlo

    if universe ~= 3 then
      return
    end

    count = #data - 18

    for i = 1, count do
      value = data:byte(i + 18)

      if value ~= values[ i ] then
        values[ i ] = value

        if mapping[ i ] then
          grp.update(mapping[ i ], value)
        end
      end
    end
  end
end

data = server:receive()
if data then
  parse(data)
end

When logging the "server" variable i get this status: udp{unconnected}: 0xb6e42ac0