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<?xml version="1.0" encoding="UTF-8" ?>
<class name="UDPServer" inherits="RefCounted" version="4.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../class.xsd">
<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:
[codeblocks]
[gdscript]
# server_node.gd
class_name ServerNode
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 packet = peer.get_packet()
print("Accepted peer: %s:%s" % [peer.get_packet_ip(), peer.get_packet_port()])
print("Received data: %s" % [packet.get_string_from_utf8()])
# Reply so it knows we received the message.
peer.put_packet(packet)
# 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.
[/gdscript]
[csharp]
// ServerNode.cs
using Godot;
using System.Collections.Generic;
public partial class ServerNode : Node
{
private UdpServer _server = new UdpServer();
private List<PacketPeerUdp> _peers = new List<PacketPeerUdp>();
public override void _Ready()
{
_server.Listen(4242);
}
public override void _Process(double delta)
{
_server.Poll(); // Important!
if (_server.IsConnectionAvailable())
{
PacketPeerUdp peer = _server.TakeConnection();
byte[] packet = peer.GetPacket();
GD.Print($"Accepted Peer: {peer.GetPacketIP()}:{peer.GetPacketPort()}");
GD.Print($"Received Data: {packet.GetStringFromUtf8()}");
// Reply so it knows we received the message.
peer.PutPacket(packet);
// Keep a reference so we can keep contacting the remote peer.
_peers.Add(peer);
}
foreach (var peer in _peers)
{
// Do something with the peers.
}
}
}
[/csharp]
[/codeblocks]
[codeblocks]
[gdscript]
# client_node.gd
class_name ClientNode
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_buffer())
if udp.get_available_packet_count() > 0:
print("Connected: %s" % udp.get_packet().get_string_from_utf8())
connected = true
[/gdscript]
[csharp]
// ClientNode.cs
using Godot;
public partial class ClientNode : Node
{
private PacketPeerUdp _udp = new PacketPeerUdp();
private bool _connected = false;
public override void _Ready()
{
_udp.ConnectToHost("127.0.0.1", 4242);
}
public override void _Process(double delta)
{
if (!_connected)
{
// Try to contact server
_udp.PutPacket("The Answer Is..42!".ToUtf8Buffer());
}
if (_udp.GetAvailablePacketCount() > 0)
{
GD.Print($"Connected: {_udp.GetPacket().GetStringFromUtf8()}");
_connected = true;
}
}
}
[/csharp]
[/codeblocks]
</description>
<tutorials>
</tutorials>
<methods>
<method name="get_local_port" qualifiers="const">
<return type="int" />
<description>
Returns the local port this server is listening to.
</description>
</method>
<method name="is_connection_available" qualifiers="const">
<return type="bool" />
<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" />
<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" />
<param index="0" name="port" type="int" />
<param index="1" name="bind_address" type="String" default=""*"" />
<description>
Starts the server by opening a UDP socket listening on the given [param port]. You can optionally specify a [param bind_address] to only listen for packets sent to that address. See also [method PacketPeerUDP.bind].
</description>
</method>
<method name="poll">
<return type="int" enum="Error" />
<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" />
<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" />
<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>
</class>
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