Art-Net DMX

[sjfp]

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

Code:

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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.