code: def _connected(self, link_uri):
          
          print('Connected to %s' % link_uri)
  
          mems = self._cf.mem.get_mems(MemoryElement.TYPE_1W)
          print('Found {} 1-wire memories'.format(len(mems)))
          if len(mems) > 0:
              print('Erasing memory {}'.format(mems[0].id))
              mems[0].erase(self._data_written)
docs: This callback is called form the Crazyflie API when a Crazyflie
          has been connected and the TOCs have been downloaded.