android模拟器端口转发失败

Question

android studio自带模拟器，接收PC端UDP数据包，接收不到。设置端口转发后也没有效果。
设置端口转发
telnet localhost 5554
auth auth_token
ok
redir add udp:pc_port:android_port
ok
redir list

android 端代码

new Thread(
            () -> {
            try {
                Log.i("udptest", "监听7777端口接收数据");
                DatagramSocket socket = new DatagramSocket(7777);
                DatagramPacket packet = new DatagramPacket(new byte[1024], 1024);

                while (true) {
                    Log.i("udptest", "监听7777端口等待接收数据");
                    try {
                        socket.receive(packet);
                        Log.i("udptest", "prot 7777 receive pack len = " + packet.getLength());
                    } catch (IOException ex) {
                        System.err.println("ex: " + ex);
                        continue;
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                }

            } catch (SocketException e) {
                e.printStackTrace();
            }



            }).start();


PC端代码


try {
            DatagramSocket socket = new DatagramSocket();
            while (true) {
                byte data[] = "a".getBytes();
                // 对方的IP和端口号
                System.out.println(data.length);
                DatagramPacket pack = new DatagramPacket(data, data.length, InetAddress.getByName("127.0.0.1"), 7777);
                socket.send(pack);
                System.out.println("send message ");
                ThreadUtil.sleep(3000);
            }
        } catch (SocketException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (UnknownHostException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

android端logcat查看一直接收不到数据，尝试更换端口，依然没有效果。
请问遇到过的朋友指教一下，会是什么原因导致的