docs: def set_toggle_mask(self, mode_mask, rfm=1):
          """Set toggle baudrate mask.
  
          The baudrate mask values are:
            1: 17.241 kbps
            2 : 9.579 kbps
            4 : 8.842 kbps
          These values can be or'ed.
          """
          cmds = {1: 'm', 2: 'M'}
          self._write_cmd('{}{}'.format(mode_mask, cmds[rfm]))