godot/doc/classes/UDPServer.xml

<?xml version="1.0" encoding="UTF-8" ?>
<class name="UDPServer" inherits="Reference" version="4.0">
	<brief_description>
		Helper class to implement a UDP server.
	</brief_description>
	<description>
		A simple server that opens a UDP socket and returns connected [PacketPeerUDP] upon receiving new packets. See also [method PacketPeerUDP.connect_to_host].
		After starting the server ([method listen]), you will need to [method poll] it at regular intervals (e.g. inside [method Node._process]) for it to process new packets, delivering them to the appropriate [PacketPeerUDP], and taking new connections.
		Below a small example of how it can be used:
		[codeblock]
		# server.gd
		extends Node

		var server := UDPServer.new()
		var peers = []

		func _ready():
		    server.listen(4242)

		func _process(delta):
		    server.poll() # Important!
		    if server.is_connection_available():
		        var peer : PacketPeerUDP = server.take_connection()
		        var pkt = peer.get_packet()
		        print("Accepted peer: %s:%s" % [peer.get_packet_ip(), peer.get_packet_port()])
		        print("Received data: %s" % [pkt.get_string_from_utf8()])
		        # Reply so it knows we received the message.
		        peer.put_packet(pkt)
		        # Keep a reference so we can keep contacting the remote peer.
		        peers.append(peer)

		    for i in range(0, peers.size()):
		        pass # Do something with the connected peers.

		[/codeblock]
		[codeblock]
		# client.gd
		extends Node

		var udp := PacketPeerUDP.new()
		var connected = false

		func _ready():
		    udp.connect_to_host("127.0.0.1", 4242)

		func _process(delta):
		    if !connected:
		        # Try to contact server
		        udp.put_packet("The answer is... 42!".to_utf8())
		    if udp.get_available_packet_count() &gt; 0:
		        print("Connected: %s" % udp.get_packet().get_string_from_utf8())
		        connected = true
		[/codeblock]
	</description>
	<tutorials>
	</tutorials>
	<methods>
		<method name="is_connection_available" qualifiers="const">
			<return type="bool">
			</return>
			<description>
				Returns [code]true[/code] if a packet with a new address/port combination was received on the socket.
			</description>
		</method>
		<method name="is_listening" qualifiers="const">
			<return type="bool">
			</return>
			<description>
				Returns [code]true[/code] if the socket is open and listening on a port.
			</description>
		</method>
		<method name="listen">
			<return type="int" enum="Error">
			</return>
			<argument index="0" name="port" type="int">
			</argument>
			<argument index="1" name="bind_address" type="String" default="&quot;*&quot;">
			</argument>
			<description>
				Starts the server by opening a UDP socket listening on the given port. You can optionally specify a [code]bind_address[/code] to only listen for packets sent to that address. See also [method PacketPeerUDP.listen].
			</description>
		</method>
		<method name="poll">
			<return type="int" enum="Error">
			</return>
			<description>
				Call this method at regular intervals (e.g. inside [method Node._process]) to process new packets. And packet from known address/port pair will be delivered to the appropriate [PacketPeerUDP], any packet received from an unknown address/port pair will be added as a pending connection (see [method is_connection_available], [method take_connection]). The maximum number of pending connection is defined via [member max_pending_connections].
			</description>
		</method>
		<method name="stop">
			<return type="void">
			</return>
			<description>
				Stops the server, closing the UDP socket if open. Will close all connected [PacketPeerUDP] accepted via [method take_connection] (remote peers will not be notified).
			</description>
		</method>
		<method name="take_connection">
			<return type="PacketPeerUDP">
			</return>
			<description>
				Returns the first pending connection (connected to the appropriate address/port). Will return [code]null[/code] if no new connection is available. See also [method is_connection_available], [method PacketPeerUDP.connect_to_host].
			</description>
		</method>
	</methods>
	<members>
		<member name="max_pending_connections" type="int" setter="set_max_pending_connections" getter="get_max_pending_connections" default="16">
			Define the maximum number of pending connections, during [method poll], any new pending connection exceeding that value will be automatically dropped. Setting this value to [code]0[/code] effectively prevents any new pending connection to be accepted (e.g. when all your players have connected).
		</member>
	</members>
	<constants>
	</constants>
</class>