docs: def wait_for_states(self, timeout=40, *states):
          """ Wait until port reaches one of the requested states.
  
          :param timeout: max time to wait for requested port states.
          """
  
          state = self.get_attribute('state')
          for _ in range(timeout):
              if state in states:
                  return
              time.sleep(1)
              state = self.get_attribute('state')
          raise TgnError('Failed to reach states {}, port state is {} after {} seconds'.format(states, state, timeout))