code: def set_muted(self, status):
          
          new_volume = self._client['config']['volume']
          new_volume['muted'] = status
          self._client['config']['volume']['muted'] = status
          yield from self._server.client_volume(self.identifier, new_volume)
          _LOGGER.info('set muted to %s on %s', status, self.friendly_name)
docs: Set client mute status.