Diode works.

Warning: it may quickly crash the server if you short-cirtuit it!

depends.txt

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+digilines

diode.lua

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+-- © 2017 numberZero
+-- License: GNU Lesser General Public License, version 2 (or any later version)
+
+local rules_in = {
+	[0] = {{x = -1, y = 0, z = 0}},
+	[1] = {{x = 0, y = 0, z = 1}},
+	[2] = {{x = 1, y = 0, z = 0}},
+	[3] = {{x = 0, y = 0, z = -1}},
+}
+
+local rules_out = {
+	[0] = {{x = 1, y = 0, z = 0}},
+	[1] = {{x = 0, y = 0, z = -1}},
+	[2] = {{x = -1, y = 0, z = 0}},
+	[3] = {{x = 0, y = 0, z = 1}},
+}
+
+local function diode_rules_in(node)
+	return rules_in[node.param2]
+end
+
+local function diode_rules_out(node)
+	return rules_out[node.param2]
+end
+
+local function diode_action(pos, node, channel, msg)
+	digiline:receptor_send(pos, diode_rules_out(node), channel, msg)
+end
+
+minetest.register_node("digiline_routing:diode", {
+	description = "Digiline Diode",
+	drawtype = "nodebox",
+	tiles = {
+		"digiline_routing_metal.png"
+	},
+	paramtype = "light",
+	paramtype2 = "facedir",
+	groups = {dig_immediate=2},
+	node_box = {
+		type = "fixed",
+		fixed = {
+			{ -8/16, -8/16, -1/16, 8/16, -7/16, 1/16 },
+			{ 1/16, -8/16, -2/16, 3/16, -6/16, 2/16 },
+			{ -3/16, -8/16, -4/16, -1/16, -6/16, 4/16 },
+			{ -1/16, -8/16, -3/16, 1/16, -6/16, 3/16 },
+		},
+	},
+	digiline = {
+		effector = {
+                        action = diode_action,
+			rules = diode_rules_in,
+		},
+		receptor = {
+			rules = diode_rules_out,
+		},
+	},
+})

init.lua

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+-- © 2017 numberZero
+-- License: GNU Lesser General Public License, version 2 (or any later version)
+-- License for textures: CreativeCommoms BY-ShareAlike
+
+local MODNAME = "digiline_routing"
+local MODPATH = minetest.get_modpath(MODNAME)
+
+-- dofile(MODPATH.."/overheating.lua")
+dofile(MODPATH.."/diode.lua")