init, changed a few things for GEIGERnet-Server, added sounds for receiving RDS message

receiver_station.lua

@@ -0,0 +1,136 @@
+ham_radio.receiver_update_infotext = function(meta, pos)
+  local frequency = meta:get_string("frequency")
+  local rds_message = meta:get_string("rds_message")
+  
+  local display_freq = (frequency ~= "") and frequency or "---"
+  local infotext = "Radio Receiver [" .. display_freq .. " kHz]"
+  
+  
+  if rds_message ~= "" then
+    infotext = infotext .. "\n" .. rds_message
+    
+    -- play rds receiving sound
+    minetest.sound_play("ham_radio_rds_msg", {
+    pos = pos,
+    max_hear_distance = 8,
+    gain = 0.8,
+})
+    
+  end
+  meta:set_string("infotext", infotext)
+end
+
+minetest.register_node("ham_radio:receiver", {
+  description = "Ham Radio Receiver",
+  tiles = {
+    "ham_radio_receiver_top.png",
+    "ham_radio_receiver_top.png",
+    "ham_radio_receiver_side.png",
+    "ham_radio_receiver_side.png",
+    "ham_radio_receiver_side.png",
+    "ham_radio_receiver_front.png"
+  },
+  groups = {cracky=2,oddly_breakable_by_hand=2},
+  sounds = default.node_sound_metal_defaults(),
+  paramtype2 = "facedir",
+  drawtype = "nodebox",
+  paramtype = "light",
+  node_box = {
+    type = "fixed",
+    fixed = {-0.5, -0.5, -0.5, 0.5, 0, 0.5},
+  },
+  light_source = 3,
+  after_place_node = function(pos, placer)
+    local meta = minetest.get_meta(pos);
+    local name = placer:get_player_name()
+    meta:set_string("formspec",
+      table.concat({
+        "size[7,4]",
+        "image[0,0;1,1;ham_radio_receiver_front.png]",
+        "field[0.25,2;7,1;frequency;Frequency;${frequency}]",
+        "tooltip[frequency;Integer number ",
+          ham_radio.settings.frequency.min,"-",
+          ham_radio.settings.frequency.max, "]",
+        "button_exit[2,3.5;3,1;;Done]"
+      },'')
+    )
+    meta:set_string("infotext", 'Radio Receiver')
+  end,
+  on_receive_fields = function(pos, formname, fields, sender)
+    if not minetest.is_player(sender) then
+      return
+    end
+
+    if (
+      fields.quit ~= "true"
+      or minetest.is_protected(pos, sender:get_player_name()) 
+    ) then
+      return
+    end
+    
+    if fields.frequency ~= nil then
+      local is_frequency_valid = ham_radio.validate_frequency(fields.frequency, true)
+      if is_frequency_valid.result == false then
+        ham_radio.errormsg(sender, is_frequency_valid.message)
+      else
+        local meta = minetest.get_meta(pos)
+        meta:set_string("frequency", fields.frequency)
+        meta:set_string("rds_message", "")
+        ham_radio.reset_receiver(pos)
+        ham_radio.receiver_update_infotext(meta)
+        ham_radio.play_tuning_sound(sender)
+      end
+    end
+  end,
+  can_dig = function(pos,player)
+    local meta = minetest.get_meta(pos);
+    local inv = meta:get_inventory()
+    local name = player:get_player_name()
+    return inv:is_empty("main") and not minetest.is_protected(pos, name)
+  end,
+  -- digiline
+  digiline = {
+    receptor = {action = function() end},
+    effector = {
+      action = ham_radio.digiline_effector_receiver
+    },
+  },
+});
+
+ham_radio.reset_receiver = function (pos)
+  local poshash = minetest.pos_to_string(pos, 0)
+  ham_radio.receiver_rds[poshash] = nil
+end
+
+minetest.register_abm(
+  {
+    label = "Listen Ham Radion Broadcast",
+    nodenames = {"ham_radio:receiver"},
+    interval = 10,
+    chance = 1,
+    catch_up = false,
+    action = function(pos, node)
+      local meta = minetest.get_meta(pos)
+      local frequency = meta:get_string("frequency")
+
+      if frequency == "" then
+        return
+      end
+
+      local poshash = minetest.pos_to_string(pos, 0)
+      if ham_radio.receiver_rds[poshash] == nil or not next(ham_radio.receiver_rds[poshash]) then
+        -- when all RDS messages are shown, reload them again
+        ham_radio.receiver_rds[poshash] = ham_radio.get_rds_messages(frequency, true)
+      end
+      ham_radio.get_next_rds_message(poshash, meta, pos)
+    end
+  }
+);
+
+ham_radio.get_next_rds_message = function (poshash, meta, pos)
+  local message = table.remove(ham_radio.receiver_rds[poshash])
+  if message ~= nil then
+    meta:set_string('rds_message', message)
+    ham_radio.receiver_update_infotext(meta, pos)
+  end
+end