Use p2p in multiplayer bomber player exchange.

We used to broadcast player info on connect and have the server relay it
to other clients.
With this approach, each peer (including server) sends its own info once
to other peers as soon as they connects.
When a new player connects, it is notified of all the already connected
peers by the `network_peer_connected` signal.
Any already connected peer is also notified of the newly connected peer
by the same signal.

networking/multiplayer_bomber/gamestate.gd

@@ -20,28 +20,23 @@ signal game_ended()
 signal game_error(what)
 
 # Callback from SceneTree
-func _player_connected(_id):
-	# This is not used in this demo, because _connected_ok is called for clients
-	# on success and will do the job.
-	pass
+func _player_connected(id):
+	# Registration of a client beings here, tell the connected player that we are here
+	rpc_id(id, "register_player", player_name)
 
 # Callback from SceneTree
 func _player_disconnected(id):
-	if get_tree().is_network_server():
-		if has_node("/root/world"): # Game is in progress
+	if has_node("/root/world"): # Game is in progress
+		if get_tree().is_network_server():
 			emit_signal("game_error", "Player " + players[id] + " disconnected")
 			end_game()
-		else: # Game is not in progress
-			# If we are the server, send to the new dude all the already registered players
-			unregister_player(id)
-			for p_id in players:
-				# Erase in the server
-				rpc_id(p_id, "unregister_player", id)
+	else: # Game is not in progress
+		# Unregister this player
+		unregister_player(id)
 
 # Callback from SceneTree, only for clients (not server)
 func _connected_ok():
-	# Registration of a client beings here, tell everyone that we are here
-	rpc("register_player", get_tree().get_network_unique_id(), player_name)
+	# We just connected to a server
 	emit_signal("connection_succeeded")
 
 # Callback from SceneTree, only for clients (not server)
@@ -56,18 +51,13 @@ func _connected_fail():
 
 # Lobby management functions
 
-remote func register_player(id, new_player_name):
-	if get_tree().is_network_server():
-		# If we are the server, let everyone know about the new player
-		rpc_id(id, "register_player", 1, player_name) # Send myself to new dude
-		for p_id in players: # Then, for each remote player
-			rpc_id(id, "register_player", p_id, players[p_id]) # Send player to new dude
-			rpc_id(p_id, "register_player", id, new_player_name) # Send new dude to player
-
+remote func register_player(new_player_name):
+	var id = get_tree().get_rpc_sender_id()
+	print(id)
 	players[id] = new_player_name
 	emit_signal("player_list_changed")
 
-remote func unregister_player(id):
+func unregister_player(id):
 	players.erase(id)
 	emit_signal("player_list_changed")
 

networking/multiplayer_bomber/player.gd

@@ -13,7 +13,7 @@ sync func setup_bomb(bomb_name, pos, by_who):
 	bomb.set_name(bomb_name) # Ensure unique name for the bomb
 	bomb.position = pos
 	bomb.from_player = by_who
-	# No need to set network mode to bomb, will be owned by master by default
+	# No need to set network master to bomb, will be owned by server by default
 	get_node("../..").add_child(bomb)
 
 var current_anim = ""