docs: def get_extended_fsm_service(self):
          '''Get a reference to the ExtendedFsmService.
  
          @return A reference to the ExtendedFsmService object
          @raises InvalidSdoServiceError
  
          '''
          with self._mutex:
              try:
                  return self._obj.get_sdo_service(RTC.ExtendedFsmService._NP_RepositoryId)._narrow(RTC.ExtendedFsmService)
              except:
                  raise exceptions.InvalidSdoServiceError('ExtendedFsmService')