local function t21_digiline_receive(pos, node, channel, msg)
 print(pos,node,channel,msg)
end

minetest.register_node("test3d:t21", {
 description = "T21 Execution Node",
 tiles = {
  {
   image="t21.png",
   animation={
    type = "vertical_frames",
    aspect_w=16,
    aspect_h=16,
    length=18,
    length=1.8,
   },
  },
 },
 on_punch = function(pos, _, _, _)
  local meta=minetest.get_meta(pos)
  local cbeep = meta:get_int("test3d_running")
--  print("cbeep ",cbeep)
  local nbeep=1
  if cbeep==1 then
   nbeep=0
  else
   nbeep=1
  end
  meta:set_int("test3d_running",nbeep)
 end,
 groups = {snappy=1,choppy=2,oddly_breakable_by_hand=2,flammable=3},
 digiline = {
  receptor = {},
  effector = {
   action = t21_digiline_receive
  }
 }
})
minetest.register_abm({
 nodenames={"test3d:t21"},
 interval=1,
 chance=1,
 action = function(pos)
  local node = minetest.get_node_or_nil(pos)
  local meta = minetest.get_meta(pos)
  local beepState = meta:get_int("test3d_running")
  if beepState == nil then beepState=1 end
--  print(beepState)
  if beepState == 1 then
   minetest.sound_play("default_break_glass",{
    pos=pos,
    max_hear_distance=100
   })
  end
 end,
})
print("Test3D loaded.")