Renet

Renet is a network library for Server/Client games written in rust. Built on top of UDP, it is focused on fast-paced games such as FPS, and competitive games that need authentication. Provides the following features:

Client/Server connection management
Authentication and encryption, checkout renetcode
Multiple types of channels:
- Reliable: garantee delivery of all messages
- Unreliable: messages that don't require any garantee of delivery or ordering
- Chunk Reliable: slice big messages to be sent in multiple frames (e.g. level initialization)
Packet fragmention and reassembly

Sections:

Usage
Demos
Plugins
Visualizer

Usage

Renet aims to have a simple API that is easy to integrate with any code base. Pool for new messages at the start of a frame with update, messages sent during a frame - or that need to be resent - are aggregated and sent together with sent_packets.

Server

let delta_time = Duration::from_millis(16);
let mut server = RenetServer::new(...);
let channel_id = 0;

// Your gameplay loop
loop {
    // Receive new messages and update clients
    server.update(delta_time)?;
    
    // Check for client connections/disconnections
    while let Some(event) = server.get_event() {
        match event {
            ServerEvent::ClientConnected(id, user_data) => {
                println!("Client {} connected", id);
            }
            ServerEvent::ClientDisconnected(id) => {
                println!("Client {} disconnected", id);
            }
        }
    }

    // Receive message from channel
    for client_id in server.clients_id().into_iter() {
        while let Some(message) = server.receive_message(client_id, channel_id) {
            // Handle received message
        }
    }
    
    // Send a text message for all clients
    server.broadcast_message(channel_id, "server message".as_bytes().to_vec());
    
    // Send message to only one client
    let client_id = ...;
    server.send_message(client_id, channel_id, "server message".as_bytes().to_vec());
 
    // Send packets to clients
    server.send_packets()?;
}

Client

let delta_time = Duration::from_millis(16);
let mut client = RenetClient::new(...);
let channel_id = 0;

// Your gameplay loop
loop {
    // Receive new messages and update client
    client.update(delta_time)?;
    
    if client.is_connected() {
        // Receive message from server
        while let Some(message) = client.receive_message(channel_id) {
            // Handle received message
        }
        
        // Send message
        client.send_message(channel_id, "client text".as_bytes().to_vec());
    }
 
    // Send packets to server
    client.send_packets()?;
}

Demos

You can checkout the echo example for a simple usage of the library. Or you can look into the two demos that have more complex uses of renet:

Bevy Demo

Simple bevy application to demonstrate how you could replicate entities and send reliable messages as commands from the server/client using renet:

Bevy.Demo.webm

Repository

Chat Demo

Simple chat application made with egui to demonstrate how you could handle errors, states transitions and client self hosting:

Chat.Demo.webm

Repository

Plugins

Checkout bevy_renet if you want to use renet as a plugin with the Bevy engine.

Visualizer

Checkout renet_visualizer for a egui plugin to plot metrics data from renet clients and servers:

renet_visualizer.mp4