Art-Net DMX

[sjfp]

Resident script, sleep time = 0. Might require some change to work with C-BUS objects.

Code:

if not client then
 ip = '192.168.2.43'
 mapping = { '1/1/1', '1/1/2', '1/1/3', '2/1/1', '2/1/2', '2/1/3' }
 universe = 1
 physical = 0

 udpsock = require('socket').udp()

 addrtoid = {}
 values = {}

 for id, addr in ipairs(mapping) do
   obj = grp.find(addr)
   addrtoid[ addr ] = id

   if obj then
     value = obj.value or 0

     if obj.datatype == dt.scale then
       value = math.floor(value * 2.55)
     end
   else
     value = 0
   end

   values[ id ] = value
 end

 function send()
   local cmd = string.char(
     -- null byte; ARTNET_DMX opcope; protocol version 14, sequence not defined
     0, 0, 0x50, 0, 14, 0,
     -- physical input port from which DMX512 data was input
     bit.band(physical, 0xFF),
     -- 15 bit Port-Address (universe)
     bit.band(universe, 0xFF), bit.rshift(universe, 8),
     -- Length
     bit.rshift(#values, 8), bit.band(#values, 0xFF)
   )

   local req = 'Art-Net' .. cmd .. string.char(unpack(values))
   udpsock:sendto(req, ip, 0x1936)
 end

 function eventhandler(event)
   local id = addrtoid[ event.dst ]
   if id then
     values[ id ] = busdatatype.decode(event.datahex, dt.uint8, event.dstraw)
     send()
   end
 end

 client = require('localbus').new()
 client:sethandler('groupwrite', eventhandler)

 send()
end

client:step()

Thank you for your assistance. Will have a go when i get back to the office tomorrow evening.