(14.05.2018, 06:28)admin Wrote: Here's a simplified function. Change universe number as needed, sequence and physical parameters can probably be zero. Value is the output channel value ranging from 0 to 255.

Code:

function artnet_dmx(ip, sequence, physical, universe, data)
 local cmd = string.char(
   -- null byte
   0,
   -- ARTNET_DMX opcope
   0, 0x50,
   -- protocol version 14
   0, 14,
   -- sequence number is used to ensure that ArtDmx packets are used in the correct order
   bit.band(sequence, 0xFF),
   -- 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(#data, 8), bit.band(#data, 0xFF)
 )

 local req = "Art-Net" .. cmd .. string.char(unpack(data))

 local sck = require("socket").udp()

 sck:sendto(req, ip, 0x1936)
 sck:close()
end

ip = '192.168.2.43'
universe = 123
value = 255
artnet_dmx(ip, 0, 0, universe, { value })

(14.05.2018, 10:26)sjfp Wrote:

(14.05.2018, 06:28)admin Wrote: Here's a simplified function. Change universe number as needed, sequence and physical parameters can probably be zero. Value is the output channel value ranging from 0 to 255.

Code:

function artnet_dmx(ip, sequence, physical, universe, data)
 local cmd = string.char(
   -- null byte
   0,
   -- ARTNET_DMX opcope
   0, 0x50,
   -- protocol version 14
   0, 14,
   -- sequence number is used to ensure that ArtDmx packets are used in the correct order
   bit.band(sequence, 0xFF),
   -- 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(#data, 8), bit.band(#data, 0xFF)
 )

 local req = "Art-Net" .. cmd .. string.char(unpack(data))

 local sck = require("socket").udp()

 sck:sendto(req, ip, 0x1936)
 sck:close()
end

ip = '192.168.2.43'
universe = 123
value = 255
artnet_dmx(ip, 0, 0, universe, { value })

Many thanks for the details. Works great. What do I need to change to control each DMX 512 Channels

(14.05.2018, 11:02)admin Wrote: You can only write full dmx-512 value array starting with the first address. So for several channels you need a script attached to all controlling groups which will write all required values.

@Erwin, it's possible to implement a simple server which only handles DMX commands. Do you have real use cases for that?

(22.05.2018, 06:00)admin Wrote: If you have many groups to control you should use a resident script which monitors all bus traffic and sends update once any group changes. I'll provide an example later on.

(23.05.2018, 08:35)admin Wrote: 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()

(23.05.2018, 09:49)sjfp Wrote:

(23.05.2018, 08:35)admin Wrote: 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.

(03.02.2020, 11:41)admin Wrote: This script sends Art-Net commands but you need a different script which receives Art-Net commands. This is doable but first you need a DMX > Art-Net converter. I think something like this should work: https://dmxking.com/artnetsacn/edmx1-pro

(03.02.2020, 12:51)admin Wrote: 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