code: def _write(self, frame):
          
          for data in frame.to_feature_reports(debug=self.debug):
              debug_str = None
              if self.debug:
                  (data, debug_str) = data
              # first, we ensure the YubiKey will accept a write
              self._waitfor_clear(yubikey_defs.SLOT_WRITE_FLAG)
              self._raw_write(data, debug_str)
          return True
docs: Write a YubiKeyFrame to the USB HID.
  
          Includes polling for YubiKey readiness before each write.