add tuning sound

beacon.lua

@@ -20,8 +20,11 @@ minetest.register_node("ham_radio:beacon", {
   light_source = 3,
   after_place_node = function(pos, placer)
     local meta = minetest.get_meta(pos);
-    local name = placer:get_player_name()
-    meta:set_string('operated_by', name)
+    if minetest.is_player(placer) then
+      local name = placer:get_player_name()
+      meta:set_string('operated_by', name)
+      ham_radio.play_tuning_sound(placer)        
+    end
     meta:set_string("frequency", ham_radio.find_free_frequency(ham_radio.settings.beacon_frequency))
     ham_radio.transmitter_update_infotext(meta)
     ham_radio.save_transmitter(pos, meta)

init.lua

@@ -33,6 +33,13 @@ function ham_radio.delete_transmitter(pos)
   mod_storage:set_string(key, '') -- storage
 end
 
+function ham_radio.play_tuning_sound(player)
+  minetest.sound_play(
+    {name = "ham_radio_tuning"..math.random(1,5)},
+    {to_player = player:get_player_name()}
+  )
+end
+
 dofile(modpath.."/config.lua")
 
 dofile(modpath.."/helpers.lua")

receiver.lua

@@ -43,6 +43,8 @@ minetest.register_on_player_receive_fields(function(player, formname, fields)
   local item = player:get_wielded_item()
   local meta = item:get_meta()
   meta:set_string("frequency", fields.frequency)
+  -- play radio sound
+  ham_radio.play_tuning_sound(player)
    -- replace wielded item with new metadata
   player:set_wielded_item(item)
    -- reset rds messages

transmitter.lua

@@ -72,6 +72,7 @@ minetest.register_node("ham_radio:transmitter", {
     meta:set_string("rds_message", fields.rds_message)
     ham_radio.transmitter_update_infotext(meta)
     ham_radio.save_transmitter(pos, meta)
+    ham_radio.play_tuning_sound(sender)
   end,
   can_dig = function(pos,player)
     local meta = minetest.get_meta(pos);