Using custom multiplayer to connect to a dedicated server and register a hosted server

server_list.gd

extends Node

# registered as an autload on both
# the dedicated server and on the player

var MY_IP
var MY_PORT
var is_player

const DEDICATED_SERVER_PORT = 1234

func _ready() -> void:
	# this node is present on both the
	# dedicated server and the players
	# only create a custom multiplayer
	# instance on the player
	if not is_player:
		return
	# setup a custom multiplayer separate
	# the global SceneTree multiplayer
	custom_multiplayer = MultiplayerAPI.new()
	custom_multiplayer.set_root_node(self)
	var peer := NetworkedMultiplayerENet.new()
	custom_multiplayer.network_peer = peer
	
	# connect to the dedicated
	# server be creating a client
	peer.create_client(
			"dedicated server address",
			DEDICATED_SERVER_PORT)
	
	# send the dedicated server an rpc
	# to register a newly hosted server
	rpc("register_server", MY_IP, MY_PORT)


func _process(_delta : float) -> void:
	if custom_multiplayer.has_network_peer():
		# custom multiplayer needs
		# to be polled manually
		custom_multiplayer.poll()


master func register_server(
		address : String, port : int) -> void:
	# registration on the dedicated server here
	pass