How to use the pyrad.server.Server._HandleAuthPacket function in pyrad

def _HandleAuthPacket(self, pkt):
            pyrad.server.Server._HandleAuthPacket(self, pkt)
            logger.info("Received authentication request")
            reply = self.CreateReplyPacket(pkt)
            reply.code = pyrad.packet.AccessAccept
            secret = reply.secret
            if self.t_events['extra'].is_set():
                reply.AddAttribute("Chargeable-User-Identity", "test-cui")
                reply.AddAttribute("User-Name", "test-user")
            if self.t_events['long'].is_set():
                reply.AddAttribute("Tunnel-Type", 13)
                reply.AddAttribute("Tunnel-Medium-Type", 6)
                reply.AddAttribute("Tunnel-Private-Group-ID", "1")
            self.SendReplyPacket(pkt.fd, reply)

def _HandleAuthPacket(self, pkt):
            pyrad.server.Server._HandleAuthPacket(self, pkt)
            logger.info("Received authentication request")
            reply = self.CreateReplyPacket(pkt)
            reply.code = pyrad.packet.AccessAccept
            if self.t_events['msg_auth'].is_set():
                logger.info("Add Message-Authenticator")
                if self.t_events['wrong_secret'].is_set():
                    logger.info("Use incorrect RADIUS shared secret")
                    pw = b"incorrect"
                else:
                    pw = reply.secret
                hmac_obj = hmac.new(pw)
                hmac_obj.update(struct.pack("B", reply.code))
                hmac_obj.update(struct.pack("B", reply.id))

                # reply attributes
                reply.AddAttribute("Message-Authenticator", 16*b"\x00")