udp port 30620

[97FBW]

Hello, I have looked at nacos-Go-SDK, in his SDK there is an extra handling of ports, the code is as follows:

[97FBW]

func (us *PushReceiver) tryListen() (*net.UDPConn, bool) {
addr, err := net.ResolveUDPAddr("udp", us.host+":"+strconv.Itoa(us.port))
if err != nil {
logger.Errorf("can't resolve address,err: %+v", err)
return nil, false
}

conn, err := net.ListenUDP("udp", addr)
if err != nil {
	logger.Errorf("error listening %s:%d,err:%+v", us.host, us.port, err)
	return nil, false
}

return conn, true

}

func (us *PushReceiver) getConn() *net.UDPConn {
for i := 0; i < 3; i++ {
r := rand.New(rand.NewSource(time.Now().UnixNano()))
port := r.Intn(1000) + 54951
us.port = port
conn, ok := us.tryListen()
if ok {
logger.Infof("udp server start, port: " + strconv.Itoa(port))
return conn
}
if !ok && i == 2 {
logger.Errorf("failed to start udp server after trying 3 times.")
}
}
return nil
}