How to use the aioblescan.aioblescan.Itself function in aioblescan

def decode(self,data):
        myinfo=NBytes("Service Data uuid",self.length)
        data=myinfo.decode(data)
        self.payload.append(myinfo)
        if data:
            myinfo=Itself("Adv Payload")
            data=myinfo.decode(data)
            self.payload.append(myinfo)
        return data

def decode(self,data):
        for x in self.payload:
            data=x.decode(data)
        code=self.payload[0]
        if code.val==b"\x02":
            ev=RepeatedField("Reports", HCI_LEM_Adv_Report)
            data=ev.decode(data)
            self.payload.append(ev)
        else:
            ev=Itself("Payload")
            data=ev.decode(data)
            self.payload.append(ev)
        return data

elif code.val == 0x14:
                myinfo=NBytes_List("Service Solicitation uuid",2)
            elif code.val == 0x15:
                myinfo=NBytes_List("Service Solicitation uuid",16)
            elif code.val == 0x16:
                myinfo=Adv_Data("Advertised Data",2)
            elif code.val == 0x1f:
                myinfo=NBytes_List("Service Solicitation uuid",4)
            elif code.val == 0x20:
                myinfo=Adv_Data("Advertised Data",4)
            elif code.val == 0x21:
                myinfo=Adv_Data("Advertised Data",16)
            elif code.val == 0xff:
                myinfo=ManufacturerSpecificData()
            else:
                myinfo=Itself("Payload for %s"%code.strval)

            xx=myinfo.decode(data[:length.val-len(code)])
            self.payload.append(myinfo)

            datalength -= length.val + len(code)
            data=data[length.val-len(code):]

        if data:
            myinfo=IntByte("rssi")
            data=myinfo.decode(data)
            self.payload.append(myinfo)
        return data