code: def strip_fixed_params(payload):
          
          if len(payload) != 12:
              return None, None, None
          idx = 0
          timestamp = Management.get_timestamp(payload[idx:idx + 8])
          idx += 8
          interval = Management.get_interval(payload[idx:idx + 2])
          idx += 2
          capabils = Management.get_fixed_capabils(payload[idx:idx + 2])
          return timestamp, interval, capabils
docs: strip(12 byte) wlan_mgt.fixed.all
          :payload: ctypes.structure
          :return: int
              timestamp
          :return: int
              beacon interval
          :return: dict
              capabilities