docs: def fan_speed(self, speed: int = None) -> bool:
          """Adjust Fan Speed by Specifying 1,2,3 as argument or cycle
              through speeds increasing by one"""
          body = helpers.req_body(self.manager, 'devicestatus')
          body['uuid'] = self.uuid
          head = helpers.req_headers(self.manager)
          if self.details.get('mode') != 'manual':
              self.mode_toggle('manual')
          else:
              if speed is not None:
                  level = int(self.details.get('level'))
                  if speed == level:
                      return False
                  elif speed in [1, 2, 3]:
                      body['level'] = speed
              else:
                  if (level + 1) > 3:
                      body['level'] = 1
                  else:
                      body['level'] = int(level + 1)
  
              r, _ = helpers.call_api('/131airPurifier/v1/device/updateSpeed',
                                      'put', json=body, headers=head)
  
              if r is not None and helpers.check_response(r, 'airpur_status'):
                  self.details['level'] = body['level']
                  return True
              else:
                  return False