docs: def stop(self, free_resource=False):
          ''' send a stop transfer request to the Aspera sdk, can  be done for:
              cancel - stop an in progress transfer
              free_resource - request to the Aspera sdk free resouces related to trasnfer_id
          '''
          if not self.is_stopped():
              self._is_stopping = True
              try:
                  if free_resource or self.is_running(False):
                      if not free_resource:
                          logger.info("StopTransfer called - %s" % self.get_transfer_id())
                      self._is_stopped = faspmanager2.stopTransfer(self.get_transfer_id())
                      if not free_resource:
                          logger.info("StopTransfer returned %s - %s" % (
                                      self._is_stopped, self.get_transfer_id()))
              except Exception as ex:
                  self.notify_exception(ex)
  
              self._is_stopping = False
  
          return self.is_stopped(False)