[TM] Communication Update

modular_ss220/balance/_balance.dme

@@ -3,9 +3,10 @@
 #include "code/access/access.dm"
 #include "code/events/blob.dm"
 #include "code/items/projectiles.dm"
-#include "code/items/weapons.dm"
+#include "code/items/radio.dm"
 #include "code/items/storage/surgical_tray.dm"
 #include "code/items/storage/closets.dm"
+#include "code/items/weapons.dm"
 #include "code/jobs/warden.dm"
 #include "code/mobs/aliens/larva.dm"
 #include "code/species/machine.dm"

modular_ss220/balance/code/items/radio.dm

@@ -0,0 +1,29 @@
+GLOBAL_LIST_INIT(radios_broadcasting_common, list(
+	/obj/item/radio/intercom,
+	/obj/item/radio/centcom,
+	/obj/item/radio/uplink,
+	/obj/item/radio/syndicate,
+	/obj/item/radio/headset/heads,
+	/obj/item/radio/headset/ert,
+	/obj/item/radio/headset/alt/deathsquad,
+	/obj/item/radio/headset/skrellian,
+	/obj/item/radio/headset/centcom,
+	/obj/item/radio/headset/syndicate,
+	/obj/item/radio/headset/uplink,
+	/obj/item/radio/headset/chameleon,
+	/obj/item/radio/headset/deadsay,
+))
+
+/obj/item/radio
+	var/can_broadcast_into_common = FALSE
+
+/obj/item/radio/Initialize(mapload)
+	. = ..()
+	if(is_type_in_list(src, GLOB.radios_broadcasting_common))
+		can_broadcast_into_common = TRUE
+
+/obj/item/radio/handle_message_mode(mob/living/M, list/message_pieces, message_mode)
+	// Check if it can be send to common.
+	if(!can_broadcast_into_common && (!message_mode || message_mode == "headset"))
+		return RADIO_CONNECTION_FAIL
+	return ..()