Art-Net DMX

[admin]

An example of Art-Net receiver. It ignores sequence and universe numbers which are not needed for general use. Edit mapping table to select which groups addresses are mapped to DMX channel numbers starting from 1. Output value for each channel is 1 byte (0..255).

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:sub(1, #header) ~= header 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