code: def _connected(self, link_uri):
          
          print('Connected to %s' % link_uri)
  
          mems = self._cf.mem.get_mems(MemoryElement.TYPE_1W)
          self._mems_to_update = len(mems)
          print('Found {} 1-wire memories'.format(len(mems)))
          for m in mems:
              print('Updating id={}'.format(m.id))
              m.update(self._data_updated)
docs: This callback is called form the Crazyflie API when a Crazyflie
          has been connected and the TOCs have been downloaded.