How to register and send custom NetworkMessages with Mirage

CustomMessageExample.cs

public static class CustomMessageExample
{
    public struct MyMessage
    {
        public string ModName;
        public int ModVersion;
    }

    public static void Setup()
    {
        // manually register functions so mirage can use them when sending MyMessage
        Mirage.Serialization.Writer<MyMessage>.Write = WriteMyMessage;
        Mirage.Serialization.Reader<MyMessage>.Read = ReadMyMessage;
    }

    private static void WriteMyMessage(NetworkWriter writer, MyMessage message)
    {
        writer.WriteString(message.ModName);
        writer.WritePackedInt32(message.ModVersion);
    }
    private static MyMessage ReadMyMessage(NetworkReader reader)
    {
        // make sure to read in same order as writing
        var name = reader.ReadString();
        var version = reader.ReadPackedInt32();
        return new MyMessage
        {
            ModName = name,
            ModVersion = version,
        };
    }

    public static void SetupHandler(NetworkServer server) // or use NetworkClient
    {
        server.MessageHandler.RegisterHandler<MyMessage>(HandleMyMessage);
    }

    private static void HandleMyMessage(INetworkPlayer player, MyMessage message)
    {
        // do stuff with message here
    }

    public static void SendCustomMessage(INetworkPlayer player)
    {
        // do this anywhere to send message
        player.Send(new MyMessage
        {
            ModName = "My Cool Mod",
            ModVersion = 1,
        });
    }
}