code: def write_data(self, data):
          
          # send data
          for ptr, value in data:
              self._write_byte(ptr, value)
          # set 'data changed'
          self._write_byte(self.fixed_format['data_changed'][0], 0xAA)
          # wait for station to clear 'data changed'
          while True:
              ack = _decode(
                  self._read_fixed_block(0x0020), self.fixed_format['data_changed'])
              if ack == 0:
                  break
              logger.debug('write_data waiting for ack')
              time.sleep(6)
docs: Write a set of single bytes to the weather station. Data must be an
          array of (ptr, value) pairs.