code: def _discover(**kwargs):
    
    query = station_server.MULTICAST_QUERY
    for host, response in multicast.send(query, **kwargs):
      try:
        result = json.loads(response)
      except ValueError:
        _LOG.warn('Received bad JSON over multicast from %s: %s', host, response)
      try:
        yield StationInfo(result['cell'], host, result['port'],
                          result['station_id'], 'ONLINE',
                          result.get('test_description'),
                          result['test_name'])
      except KeyError:
        if 'last_activity_time_millis' in result:
          _LOG.debug('Received old station API response on multicast. Ignoring.')
        else:
          _LOG.warn('Received bad multicast response from %s: %s', host, response)
docs: Yields info about station servers announcing themselves via multicast.