code: def mute(self, mute):
          
          try:
              if (mute and self._mute == STATE_OFF):
                  self.send_command("MUTE_TOGGLE")
                  self._mute = STATE_ON
                  return True
              elif not mute and self._mute == STATE_ON:
                  self.send_command("MUTE_TOGGLE")
                  self._mute = STATE_OFF
                  return True
          except requests.exceptions.RequestException:
              _LOGGER.error("Connection error: mute command not sent.")
              return False
docs: Mute receiver