[WebGet(UriTemplate = "{deviceId}/{username=null}/{password=null}")]
        public IEnumerable<Session> Get(string username, string password, string deviceId)
        {

            if (String.IsNullOrEmpty(username))
                throw new HttpResponseException(HttpStatusCode.BadRequest);
            if (String.IsNullOrEmpty(password))
                throw new HttpResponseException(HttpStatusCode.BadRequest);

            var session = new List<Session>();

            var employee = db.EEEs
                            .Where(e => e.MBL_WORKER_ID == username && e.MBL_WORKER_PIN == password)
                            .SingleOrDefault();
            var device = db.PMS_MBL_DVCs
                            .Where(d => d.AUID == deviceId)
                            .SingleOrDefault();

            if (employee == null || device == null)
                throw new HttpResponseException(HttpStatusCode.NoContent);

            try
            {
                device = db.mbl_update_device_suid(device.DVC_ID).AsQueryable<PMS_MBL_DVC>().FirstOrDefault();
            }
            catch (Exception ex)
            {
                throw new HttpResponseException(HttpStatusCode.InternalServerError);
            }

            session.Add(new Session { SessionID = 1, result = "success", employeeId = employee.EE_ID, uniqueId = device.SUID.ToString() });

            return session;

        }