Some fixes

elepower_wireless/machines/dialler.lua

@@ -42,6 +42,7 @@ local function get_formspec(power, player, transmitters, receivers)
 		ele.formspec.power_meter(power)..
 		"textlist[1,0;6.8,2.5;transmitter;" .. table.concat(list_tr, ",") .. tr_spc .. "]"..
 		"textlist[1,3;6.8,2.5;receiver;" .. table.concat(list_re, ",") .. re_spc .. "]"..
+		"button[6,5.75;2,0.25;refresh;Refresh]"..
 		"label[0,5.75;Owned by " .. player .. "]"..
 		"list[current_player;main;0,6.25;8,1;]"..
 		"list[current_player;main;0,7.5;8,3;8]"..
@@ -158,6 +159,11 @@ ele.register_machine("elepower_wireless:dialler", {
 			return
 		end
 
+		if fields["refresh"] then
+			minetest.get_node_timer(pos):start(0.2)
+			return
+		end
+
 		if not fields["transmitter"] and not fields["receiver"] then
 			return
 		end

elepower_wireless/machines/matter_receiver.lua

@@ -106,6 +106,7 @@ ele.register_machine("elepower_wireless:matter_receiver", {
 		local meta = minetest.get_meta(pos)
 		if fields["name"] and fields["key_enter"] == "true" then
 			meta:set_string("name", fields["name"])
+			minetest.get_node_timer(pos):start(0.2)
 		end
 	end,
 	after_destruct = function (pos)

elepower_wireless/machines/matter_transmitter.lua

@@ -141,6 +141,8 @@ minetest.register_abm({
 				local tpos = minetest.string_to_pos(meta:get_string("target"))
 
 				if tpos then
+					local tnode = minetest.get_node_or_nil(tpos)
+					if tnode and ele.helpers.get_item_group(tnode.name, "matter_receiver") then
 						local storage  = ele.helpers.get_node_property(meta, pos, "storage")
 						local usage    = ele.helpers.get_node_property(meta, pos, "usage")
 
@@ -155,6 +157,10 @@ minetest.register_abm({
 								break
 							end
 						end
+					else
+						meta:set_string("target", "")
+						minetest.get_node_timer(pos):start(0.2)
+					end
 				end
 			end
 		end