@GET
 @Path("/sensorVariableTypesBySenRef/{sensorRefId}")
 public Response getSensorVariableTypesBySensorRefId(@PathParam("sensorRefId") int sensorRefId) {
   Sensor sensor = DaoUtils.getSensorDao().get(sensorRefId);
   if (sensor != null && sensor.getType() != null) {
     return RestUtils.getResponse(
         Status.OK,
         TypesUtils.getSensorVariableTypes(sensor.getType(), sensor.getVariableTypes()));
   }
   return RestUtils.getResponse(
       Status.BAD_REQUEST,
       new ApiError(
           "Requested Sensor["
               + sensor.getName()
               + "] type not available or Sensor not available"));
 }