private boolean register(String deviceId, String name) {
   try {
     DeviceIdentifier deviceIdentifier = new DeviceIdentifier();
     deviceIdentifier.setId(deviceId);
     deviceIdentifier.setType(VirtualFireAlarmConstants.DEVICE_TYPE);
     if (APIUtil.getDeviceManagementService().isEnrolled(deviceIdentifier)) {
       return false;
     }
     Device device = new Device();
     device.setDeviceIdentifier(deviceId);
     EnrolmentInfo enrolmentInfo = new EnrolmentInfo();
     enrolmentInfo.setDateOfEnrolment(new Date().getTime());
     enrolmentInfo.setDateOfLastUpdate(new Date().getTime());
     enrolmentInfo.setStatus(EnrolmentInfo.Status.ACTIVE);
     enrolmentInfo.setOwnership(EnrolmentInfo.OwnerShip.BYOD);
     device.setName(name);
     device.setType(VirtualFireAlarmConstants.DEVICE_TYPE);
     enrolmentInfo.setOwner(APIUtil.getAuthenticatedUser());
     device.setEnrolmentInfo(enrolmentInfo);
     return APIUtil.getDeviceManagementService().enrollDevice(device);
   } catch (DeviceManagementException e) {
     log.error(e.getMessage(), e);
     return false;
   }
 }
  @POST
  @Path("device/{deviceId}/buzz")
  public Response switchBuzzer(
      @PathParam("deviceId") String deviceId, @FormParam("state") String state) {
    if (state == null || state.isEmpty()) {
      log.error("State is not defined for the buzzer operation");
      return Response.status(Response.Status.BAD_REQUEST).build();
    }
    String switchToState = state.toUpperCase();
    if (!switchToState.equals(VirtualFireAlarmConstants.STATE_ON)
        && !switchToState.equals(VirtualFireAlarmConstants.STATE_OFF)) {
      log.error("The requested state change shoud be either - 'ON' or 'OFF'");
      return Response.status(Response.Status.BAD_REQUEST).build();
    }
    try {
      if (!APIUtil.getDeviceAccessAuthorizationService()
          .isUserAuthorized(
              new DeviceIdentifier(deviceId, VirtualFireAlarmConstants.DEVICE_TYPE),
              DeviceGroupConstants.Permissions.DEFAULT_OPERATOR_PERMISSIONS)) {
        return Response.status(Response.Status.UNAUTHORIZED.getStatusCode()).build();
      }
      String resource = VirtualFireAlarmConstants.BULB_CONTEXT.replace("/", "");
      PrivateKey serverPrivateKey = VirtualFirealarmSecurityManager.getServerPrivateKey();
      String actualMessage = resource + ":" + switchToState;
      String encryptedMsg =
          VirtualFireAlarmServiceUtils.prepareSecurePayLoad(actualMessage, serverPrivateKey);
      String publishTopic =
          APIUtil.getTenantDomainOftheUser()
              + "/"
              + VirtualFireAlarmConstants.DEVICE_TYPE
              + "/"
              + deviceId;

      Operation commandOp = new CommandOperation();
      commandOp.setCode("buzz");
      commandOp.setType(Operation.Type.COMMAND);
      commandOp.setEnabled(true);
      commandOp.setPayLoad(encryptedMsg);

      Properties props = new Properties();
      props.setProperty(VirtualFireAlarmConstants.MQTT_ADAPTER_TOPIC_PROPERTY_NAME, publishTopic);
      props.setProperty(
          VirtualFireAlarmConstants.CLIENT_JID_PROPERTY_KEY,
          deviceId + "@" + XmppConfig.getInstance().getServerName());
      props.setProperty(VirtualFireAlarmConstants.SUBJECT_PROPERTY_KEY, "CONTROL-REQUEST");
      props.setProperty(
          VirtualFireAlarmConstants.MESSAGE_TYPE_PROPERTY_KEY,
          VirtualFireAlarmConstants.CHAT_PROPERTY_KEY);
      commandOp.setProperties(props);

      List<DeviceIdentifier> deviceIdentifiers = new ArrayList<>();
      deviceIdentifiers.add(new DeviceIdentifier(deviceId, VirtualFireAlarmConstants.DEVICE_TYPE));
      APIUtil.getDeviceManagementService()
          .addOperation(VirtualFireAlarmConstants.DEVICE_TYPE, commandOp, deviceIdentifiers);
      return Response.ok().build();
    } catch (DeviceAccessAuthorizationException e) {
      log.error(e.getErrorMessage(), e);
      return Response.status(Response.Status.INTERNAL_SERVER_ERROR).build();
    } catch (VirtualFireAlarmException e) {
      String errorMsg = "Preparing Secure payload failed for device - [" + deviceId + "]";
      log.error(errorMsg);
      return Response.status(Response.Status.INTERNAL_SERVER_ERROR).build();
    } catch (OperationManagementException e) {
      String msg = "Error occurred while executing command operation upon ringing the buzzer";
      log.error(msg, e);
      return Response.status(Response.Status.INTERNAL_SERVER_ERROR).build();
    }
  }