OpenNetworkChannel.cs

// This code is client #1. All is unity examples

public void OnClick()
{
    var lobbyManager = discord.GetLobbyManager();
    lobbyManager.SendNetworkMessage(lobby.Id, 363446008341987328, 0, System.Text.Encoding.UTF8.GetBytes("Sup"));
}

void OnEnable()
{
    Debug.Log("Discord: init");
    callbackCalls = 0;

    discord = new Discord.Discord(clientId, (UInt64)Discord.CreateFlags.Default);
    discord.SetLogHook(Discord.LogLevel.Debug, (level, message) =>
    {
        Debug.Log(string.Format("Log[{0}] {1}", level, message));
    });

    var userManager = discord.GetUserManager();
    userManager.OnCurrentUserUpdate += CurrentUserCallback;

    var lobbyManager = discord.GetLobbyManager();

    lobbyManager.OnNetworkMessage += (lobbyId, userId, channelId, data) =>
    {
        var message = System.Text.Encoding.UTF8.GetString(data);
        Debug.Log("User is " + userId);
        Debug.Log(message);
    };

    var txn = lobbyManager.GetLobbyCreateTransaction();
    txn.SetCapacity(2);
    lobbyManager.CreateLobby(txn, (Discord.Result result, ref Discord.Lobby lobby) =>
    {
        _lobbyId = lobby.Id;
        Debug.Log(lobbyManager.GetLobbyActivitySecret(lobby.Id));
        lobbyManager.ConnectNetwork(lobby.Id);
        lobbyManager.OpenNetworkChannel(lobby.Id, 0, true);
    });

}

void LateUpdate()
{
    var lobbyManager = discord.GetLobbyManager();
    lobbyManager.FlushNetwork();
}

void Update()
{
    discord.RunCallbacks();
}

------

// This is client #2
void OnEnable()
{
    Debug.Log("Discord: init");
    callbackCalls = 0;
    System.Environment.SetEnvironmentVariable("DISCORD_INSTANCE_ID", "1");

    discord = new Discord.Discord(clientId, (UInt64)Discord.CreateFlags.Default);
    discord.SetLogHook(Discord.LogLevel.Debug, (level, message) =>
    {
        Debug.Log(string.Format("Log[{0}] {1}", level, message));
    });

    var userManager = discord.GetUserManager();
    userManager.OnCurrentUserUpdate += CurrentUserCallback;

    var lobbyManager = discord.GetLobbyManager();

    lobbyManager.OnNetworkMessage += (lobbyId, userId, channelId, data) =>
    {
        var message = System.Text.Encoding.UTF8.GetString(data);
        Debug.Log("User is " + userId);
        Debug.Log(message);
    };

    lobbyManager.ConnectLobbyWithActivitySecret("601214929147789312:cc288206d3263aa9", (Discord.Result result, ref Discord.Lobby lobby) =>
    {
        lobbyManager.ConnectNetwork(lobby.Id);
        lobbyManager.OpenNetworkChannel(lobby.Id, 0, true);
        lobbyManager.SendNetworkMessage(lobby.Id, 53908232506183680, 0, System.Text.Encoding.UTF8.GetBytes("Sup"));
        Debug.Log("Sent message");
    });
}