public ServerConnection(IChannel channel)
        {
            this.channel = channel;

            IServerManager sm = MgrManager.Instance.GetManager <IServerManager>();

            if (sm == null)
            {
                Debug.Log("server manager is null");
                return;
            }

            if (sm.GetServerConnection() == null)
            {
                sm.AddServerConnection(this);
            }
        }