added existing work

depends.txt

@@ -0,0 +1,2 @@
+default
+digilines

init.lua

@@ -0,0 +1,57 @@
+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.")