code: def _connected(self, link_uri):
          
          print('Connected to %s' % link_uri)
  
          mems = self._cf.mem.get_mems(MemoryElement.TYPE_I2C)
          print('Found {} EEPOM(s)'.format(len(mems)))
          if len(mems) > 0:
              print('Writing default configuration to'
                    ' memory {}'.format(mems[0].id))
  
              elems = mems[0].elements
              elems['version'] = 1
              elems['pitch_trim'] = 0.0
              elems['roll_trim'] = 0.0
              elems['radio_channel'] = 80
              elems['radio_speed'] = 0
              elems['radio_address'] = 0xE7E7E7E7E7
  
              mems[0].write_data(self._data_written)
docs: This callback is called form the Crazyflie API when a Crazyflie
          has been connected and the TOCs have been downloaded.