LiteNetLib 2

Lite reliable UDP library for .NET Standard 2.1 (Mono, .NET)

HighLevel API Part: LiteEntitySystem

Matrix chat: Matrix

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OLD BRANCH (and examples) for 1.x

Little Game Example on Unity

Documentation

Build

NuGet

Release builds

DLL build from master

( Warning! Master branch can be unstable! )

Features

• Lightweight
  • Small CPU and RAM usage
  • Small packet size overhead ( 1 byte for unreliable, 4 bytes for reliable packets )
• Simple connection handling
• Peer to peer connections
• Helper classes for sending and reading messages
• Multiple data channels
• Different send mechanics
  • Reliable with order
  • Reliable without order
  • Reliable sequenced (reliable only last packet)
  • Ordered but unreliable with duplication prevention
  • Simple UDP packets without order and reliability
• Fast packet serializer (Usage manual)
• Automatic small packets merging
• Automatic fragmentation of reliable packets
• Automatic MTU detection
• Optional CRC32C checksums
• UDP NAT hole punching
• NTP time requests
• Packet loss and latency simulation
• IPv6 support (using separate socket for performance)
• Connection statistics
• Multicasting (for discovering hosts in local network)
• Unity support
• Support for .NET8 optimized socket calls (much less gc)
• Supported platforms:
  • Windows/Mac/Linux (.NET Framework, Mono, .NET Core, .NET Standard)
  • Lumin OS (Magic Leap)
  • MonoGame
  • Godot
  • Unity 2021.2 (Desktop platforms, Android, iOS, Switch)

Support developer

• 

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Unity notes!!!

• Minimal supported Unity is 2021.2. For older Unity versions use 1.x library versions
• Always use library sources or OpenUPM package instead of precompiled DLL files ( because there are platform specific #ifdefs and workarounds for unity bugs )

Usage samples

Client

var listener = new EventBasedNetListener();
var client = new NetManager(listener);
client.Start();
client.Connect("localhost" /* host IP or name */, 9050 /* port */, "SomeConnectionKey" /* text key or NetDataWriter */);
listener.NetworkReceiveEvent += (fromPeer, dataReader, channel, deliveryMethod) =>
{
    Console.WriteLine("We got: {0}", dataReader.GetString(100 /* max length of string */));
    dataReader.Recycle();
};

while (!Console.KeyAvailable)
{
    client.PollEvents();
    Thread.Sleep(15);
}

client.Stop();

Server

var listener = new EventBasedNetListener();
var server = new NetManager(listener);
server.Start(9050 /* port */);

listener.ConnectionRequestEvent += request =>
{
    if(server.ConnectedPeersCount < 10 /* max connections */)
        request.AcceptIfKey("SomeConnectionKey");
    else
        request.Reject();
};

listener.PeerConnectedEvent += peer =>
{
    Console.WriteLine("We got connection: {0}", peer);  // Show peer IP
    var writer = new NetDataWriter();         // Create writer class
    writer.Put("Hello client!");                        // Put some string
    peer.Send(writer, DeliveryMethod.ReliableOrdered);  // Send with reliability
};

while (!Console.KeyAvailable)
{
    server.PollEvents();
    Thread.Sleep(15);
}
server.Stop();