private void _sendNewMessageNotification(int roomID, Message item, RoomUser authorUser, List<RoomUser> users)
        {
             var _serializationSettings = new JsonSerializerSettings()
             {
                 ContractResolver = new CamelCasePropertyNamesContractResolver()
             };


            var json = JsonConvert.SerializeObject(new
            {
                result = true,
                roomID,
                user = authorUser,
                item = item
            }, _serializationSettings);

            // вытаскиваем всех юзеров которые это могут получить из connections
            var s = new SignalRHub();
            var allConnections = s.GetConnectionsInfo();
            var connectionIDs = new List<string>();
            var context = GlobalHost.ConnectionManager.GetHubContext<SignalRHub>();

            var usernames = users.Select(x => x.Username).ToList();
            var selConnections = allConnections.Where(x => usernames.Contains(x.data.username)).ToList();

            if (selConnections.Count > 0)
            {
                var ids = selConnections.Select(x => x.id).ToList();
                context.Clients.Clients(ids).messageReceived(json);
            }
        }