Art-Net DMX

[admin]

Here's a rudimentary server example (resident script, sleep time = 0). Only DMX command is supported, sequences are not supported, universe number is ignored.

Code:

if not server then
 mapping = { '32/1/1', '32/1/2', '32/1/3' }
 cache = {}
 header = 'Art-Net' .. string.char(0, 0, 0x50, 0, 14)

 function parse(data)
   if #data < 19 then
     return
   end

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

   local values = data:sub(19)
   for i = 1, #values do
     local value = values:byte(i)

     if mapping[ i ] and cache[ i ] ~= value then
       cache[ i ] = value
       grp.write(mapping[ i ], value, dt.uint8)
     end
   end
 end

 server = require('socket').udp()
 server:settimeout(3)
 server:setsockname('*', 0x1936)
end

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