java UDP 广播 无法接收的问题 在线等~~求好人帮帮 要奔溃了

	byte[] msg = new String("{\"ip\":\"192.168.155.3\",\"port\":\"8811\"}").getBytes();

		byte[] bs = new byte[] { (byte) 255, (byte) 255, (byte) 255, (byte) 255 };

		InetAddress inetAddr = InetAddress.getByAddress(bs);

		DatagramSocket client = new DatagramSocket();

		client.setBroadcast(true);//开启广播

		client.setTrafficClass(0x04);//可靠的

		DatagramPacket sendPack = new DatagramPacket(msg, msg.length, inetAddr, 46953);

		client.setSoTimeout(0);

		client.send(sendPack);

		client.close();

# -*- coding: utf-8 -*-

import socket, json  

local_ip = '192.168.155.3' # 电脑端地址

local_port = 31500

local = (local_ip, local_port)

remote = ("255.255.255.255", 46953)

s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)

s.bind(local)

s.setsockopt(socket.SOL_SOCKET, socket.SO_BROADCAST, 1)

s.sendto(json.dumps({"ip":local_ip, "port": local_port}), remote)

while True:

    data, addr = s.recvfrom(2048)

    if not data:

        print "client has exist"

        break

    print "received:", data, "from", addr

s.close()