EasySteamSockets is a library that builds on the Steam socket server networking provided in Facepunch.Steamworks. The sample project is a lightweight WinForm app to demonstrate sending two types of payloads:

Note: that the library needs a one-time initialisation by providing it the assembly that has the payloads defined in it.

{
    EasySteamSockets.Initialiser.Initialise(Assembly.GetExecutingAssembly());
}

See FormClient.cs for a fully worked example. The code snippets below are taken from this class.

Note that for byte type payloads that might be sent often, it is possible to re-use messages.

{
    PlayerPositionUpdateMessage playerPositionUpdateMessage = new()
    {
        Id = 123,
        X = x,
        Y = y,
    };

    client?.SendMessage(playerPositionUpdateMessage, SendType.Reliable);
}

Periodically call Receive on the client or server as appropriate e.g.

    client?.Receive();
    server?.Receive();

Note that the received messages are reused the next time the same type is received therefore don't keep a reference to it.

{   
    client?.Events.Subscribe<ChatMessage>(ChatMessageReceived);
}

private void ChatMessageReceived(ChatMessage chatMessage)
{
    // Consume chatMessage here.
}