Node.js NodeJS UDP多播如何_Node.js_Udp_Socket.io_Multicast

Node.js NodeJS UDP多播如何

node.js udp socket.io

Node.js NodeJS UDP多播如何,node.js,udp,socket.io,multicast,Node.js,Udp,Socket.io,Multicast,我正在尝试将UDP多播数据包发送到：230.185.192.108，以便所有订阅的用户都能收到。有点卡住了。我相信它的广播是正确的，但似乎无法从任何客户那里获得任何信息服务器： var news = [ "Borussia Dortmund wins German championship", "Tornado warning for the Bay Area", "More rain for the weekend", "Android tablets take ov

我正在尝试将UDP多播数据包发送到：230.185.192.108，以便所有订阅的用户都能收到。有点卡住了。我相信它的广播是正确的，但似乎无法从任何客户那里获得任何信息

服务器：

var news = [
   "Borussia Dortmund wins German championship",
   "Tornado warning for the Bay Area",
   "More rain for the weekend",
   "Android tablets take over the world",
   "iPad2 sold out",
   "Nation's rappers down to last two samples"
];

var dgram = require('dgram'); 
var server = dgram.createSocket("udp4"); 
server.bind();
server.setBroadcast(true)
server.setMulticastTTL(128);
server.addMembership('230.185.192.108'); 

setInterval(broadcastNew, 3000);

function broadcastNew() {
    var message = new Buffer(news[Math.floor(Math.random()*news.length)]);
    server.send(message, 0, message.length, 8088, "230.185.192.108");
    console.log("Sent " + message + " to the wire...");
    //server.close();
}

client.addMembership('230.185.192.108');

//Multicast Server sending messages
var news = [
   "Borussia Dortmund wins German championship",
   "Tornado warning for the Bay Area",
   "More rain for the weekend",
   "Android tablets take over the world",
   "iPad2 sold out",
   "Nation's rappers down to last two samples"
];

var PORT = 41848;
var MCAST_ADDR = "230.185.192.108"; //not your IP and should be a Class D address, see http://www.iana.org/assignments/multicast-addresses/multicast-addresses.xhtml
var dgram = require('dgram'); 
var server = dgram.createSocket("udp4"); 
server.bind(PORT, function(){
    server.setBroadcast(true);
    server.setMulticastTTL(128);
    server.addMembership(MCAST_ADDR);
});

setInterval(broadcastNew, 3000);

function broadcastNew() {
    var message = new Buffer(news[Math.floor(Math.random()*news.length)]);
    server.send(message, 0, message.length, PORT,MCAST_ADDR);
    console.log("Sent " + message + " to the wire...");
}

//Multicast Client receiving sent messages
var PORT = 41848;
var MCAST_ADDR = "230.185.192.108"; //same mcast address as Server
var HOST = '192.168.1.9'; //this is your own IP
var dgram = require('dgram');
var client = dgram.createSocket('udp4');

client.on('listening', function () {
    var address = client.address();
    console.log('UDP Client listening on ' + address.address + ":" + address.port);
    client.setBroadcast(true)
    client.setMulticastTTL(128); 
    client.addMembership(MCAST_ADDR);
});

client.on('message', function (message, remote) {   
    console.log('MCast Msg: From: ' + remote.address + ':' + remote.port +' - ' + message);
});

client.bind(PORT, HOST);

客户端

var PORT = 8088;
var HOST = '192.168.0.102';
var dgram = require('dgram');
var client = dgram.createSocket('udp4');

client.on('listening', function () {
    var address = client.address();
    console.log('UDP Client listening on ' + address.address + ":" + address.port);
    client.setBroadcast(true)
    client.setMulticastTTL(128); 
    client.addMembership('230.185.192.108');
});

client.on('message', function (message, remote) {   
    console.log('A: Epic Command Received. Preparing Relay.');
    console.log('B: From: ' + remote.address + ':' + remote.port +' - ' + message);
});

client.bind(PORT, HOST);

参考有关NodeJS数据报的更多信息

更改：

var news = [
   "Borussia Dortmund wins German championship",
   "Tornado warning for the Bay Area",
   "More rain for the weekend",
   "Android tablets take over the world",
   "iPad2 sold out",
   "Nation's rappers down to last two samples"
];

var dgram = require('dgram'); 
var server = dgram.createSocket("udp4"); 
server.bind();
server.setBroadcast(true)
server.setMulticastTTL(128);
server.addMembership('230.185.192.108'); 

setInterval(broadcastNew, 3000);

function broadcastNew() {
    var message = new Buffer(news[Math.floor(Math.random()*news.length)]);
    server.send(message, 0, message.length, 8088, "230.185.192.108");
    console.log("Sent " + message + " to the wire...");
    //server.close();
}

client.addMembership('230.185.192.108');

//Multicast Server sending messages
var news = [
   "Borussia Dortmund wins German championship",
   "Tornado warning for the Bay Area",
   "More rain for the weekend",
   "Android tablets take over the world",
   "iPad2 sold out",
   "Nation's rappers down to last two samples"
];

var PORT = 41848;
var MCAST_ADDR = "230.185.192.108"; //not your IP and should be a Class D address, see http://www.iana.org/assignments/multicast-addresses/multicast-addresses.xhtml
var dgram = require('dgram'); 
var server = dgram.createSocket("udp4"); 
server.bind(PORT, function(){
    server.setBroadcast(true);
    server.setMulticastTTL(128);
    server.addMembership(MCAST_ADDR);
});

setInterval(broadcastNew, 3000);

function broadcastNew() {
    var message = new Buffer(news[Math.floor(Math.random()*news.length)]);
    server.send(message, 0, message.length, PORT,MCAST_ADDR);
    console.log("Sent " + message + " to the wire...");
}

//Multicast Client receiving sent messages
var PORT = 41848;
var MCAST_ADDR = "230.185.192.108"; //same mcast address as Server
var HOST = '192.168.1.9'; //this is your own IP
var dgram = require('dgram');
var client = dgram.createSocket('udp4');

client.on('listening', function () {
    var address = client.address();
    console.log('UDP Client listening on ' + address.address + ":" + address.port);
    client.setBroadcast(true)
    client.setMulticastTTL(128); 
    client.addMembership(MCAST_ADDR);
});

client.on('message', function (message, remote) {   
    console.log('MCast Msg: From: ' + remote.address + ':' + remote.port +' - ' + message);
});

client.bind(PORT, HOST);

到

这个答案很古老，但在谷歌的搜索结果中显示得很高。对于节点v4.4.3，服务器示例失败，出现错误EBADF。下面列出了完整的工作代码块：

服务器：

var news = [
   "Borussia Dortmund wins German championship",
   "Tornado warning for the Bay Area",
   "More rain for the weekend",
   "Android tablets take over the world",
   "iPad2 sold out",
   "Nation's rappers down to last two samples"
];

var dgram = require('dgram'); 
var server = dgram.createSocket("udp4"); 
server.bind();
server.setBroadcast(true)
server.setMulticastTTL(128);
server.addMembership('230.185.192.108'); 

setInterval(broadcastNew, 3000);

function broadcastNew() {
    var message = new Buffer(news[Math.floor(Math.random()*news.length)]);
    server.send(message, 0, message.length, 8088, "230.185.192.108");
    console.log("Sent " + message + " to the wire...");
    //server.close();
}

client.addMembership('230.185.192.108');

//Multicast Server sending messages
var news = [
   "Borussia Dortmund wins German championship",
   "Tornado warning for the Bay Area",
   "More rain for the weekend",
   "Android tablets take over the world",
   "iPad2 sold out",
   "Nation's rappers down to last two samples"
];

var PORT = 41848;
var MCAST_ADDR = "230.185.192.108"; //not your IP and should be a Class D address, see http://www.iana.org/assignments/multicast-addresses/multicast-addresses.xhtml
var dgram = require('dgram'); 
var server = dgram.createSocket("udp4"); 
server.bind(PORT, function(){
    server.setBroadcast(true);
    server.setMulticastTTL(128);
    server.addMembership(MCAST_ADDR);
});

setInterval(broadcastNew, 3000);

function broadcastNew() {
    var message = new Buffer(news[Math.floor(Math.random()*news.length)]);
    server.send(message, 0, message.length, PORT,MCAST_ADDR);
    console.log("Sent " + message + " to the wire...");
}

//Multicast Client receiving sent messages
var PORT = 41848;
var MCAST_ADDR = "230.185.192.108"; //same mcast address as Server
var HOST = '192.168.1.9'; //this is your own IP
var dgram = require('dgram');
var client = dgram.createSocket('udp4');

client.on('listening', function () {
    var address = client.address();
    console.log('UDP Client listening on ' + address.address + ":" + address.port);
    client.setBroadcast(true)
    client.setMulticastTTL(128); 
    client.addMembership(MCAST_ADDR);
});

client.on('message', function (message, remote) {   
    console.log('MCast Msg: From: ' + remote.address + ':' + remote.port +' - ' + message);
});

client.bind(PORT, HOST);

客户端：

var news = [
   "Borussia Dortmund wins German championship",
   "Tornado warning for the Bay Area",
   "More rain for the weekend",
   "Android tablets take over the world",
   "iPad2 sold out",
   "Nation's rappers down to last two samples"
];

var dgram = require('dgram'); 
var server = dgram.createSocket("udp4"); 
server.bind();
server.setBroadcast(true)
server.setMulticastTTL(128);
server.addMembership('230.185.192.108'); 

setInterval(broadcastNew, 3000);

function broadcastNew() {
    var message = new Buffer(news[Math.floor(Math.random()*news.length)]);
    server.send(message, 0, message.length, 8088, "230.185.192.108");
    console.log("Sent " + message + " to the wire...");
    //server.close();
}

client.addMembership('230.185.192.108');

//Multicast Server sending messages
var news = [
   "Borussia Dortmund wins German championship",
   "Tornado warning for the Bay Area",
   "More rain for the weekend",
   "Android tablets take over the world",
   "iPad2 sold out",
   "Nation's rappers down to last two samples"
];

var PORT = 41848;
var MCAST_ADDR = "230.185.192.108"; //not your IP and should be a Class D address, see http://www.iana.org/assignments/multicast-addresses/multicast-addresses.xhtml
var dgram = require('dgram'); 
var server = dgram.createSocket("udp4"); 
server.bind(PORT, function(){
    server.setBroadcast(true);
    server.setMulticastTTL(128);
    server.addMembership(MCAST_ADDR);
});

setInterval(broadcastNew, 3000);

function broadcastNew() {
    var message = new Buffer(news[Math.floor(Math.random()*news.length)]);
    server.send(message, 0, message.length, PORT,MCAST_ADDR);
    console.log("Sent " + message + " to the wire...");
}

//Multicast Client receiving sent messages
var PORT = 41848;
var MCAST_ADDR = "230.185.192.108"; //same mcast address as Server
var HOST = '192.168.1.9'; //this is your own IP
var dgram = require('dgram');
var client = dgram.createSocket('udp4');

client.on('listening', function () {
    var address = client.address();
    console.log('UDP Client listening on ' + address.address + ":" + address.port);
    client.setBroadcast(true)
    client.setMulticastTTL(128); 
    client.addMembership(MCAST_ADDR);
});

client.on('message', function (message, remote) {   
    console.log('MCast Msg: From: ' + remote.address + ':' + remote.port +' - ' + message);
});

client.bind(PORT, HOST);

对于像我这样的新手，

client.bind（端口、主机）是重要的一位。当绑定到HOST=127.0.0.1
时，我无法让客户端接收到任何内容，但在使用IP地址时，客户端工作。同样，如果主机被排除在外，当使用一台机器进行测试时，该示例将不起作用（客户端将抛出EADDRINUSE错误）
对我来说很好。可能是防火墙或路由问题？嘿，马库斯，订阅230.185.192.108之后，您就可以接收多播服务器消息了？是的。我只在同一台机器上本地尝试过，但客户端会收到消息。编辑：可能值得注意的是，由于特权的原因，我使用了端口61088而不是8088。我更改了client.addMembership（'230.185.192.108'）；致client.addMembership（'230.185.192.108'，'HOST'）；这似乎已经做到了。我也在本地做每件事。嘿，再次感谢你的帮助，马库斯。你的标题是多播，但你的问题是广播。是哪一个？怎么回事？如果没有指定主机，操作系统应该尝试绑定到所有适用的接口，因此通过只指定一个主机，我们只限制操作系统将绑定到的接口，对吗？如果没有指定主机，它会随机选择一个。显然：@WillemMulder您考虑的是TCP。UDP多播不是这样工作的。这不是TCP绑定，它是UDP多播组联接。@EJP是的，它是UDP，组通常在特定接口上联接（通过设置主机变量标识）。我想知道如何使addMembership更具限制性来解决这个问题，但是Segfault指出，忽略主机变量并不会绑定到所有接口，而是随机绑定到一个接口。这是一种奇怪的行为，这就是为什么指定主机可以解决问题，因为现在行为变得可预测。将dgram.createSocket（'udp4'）
更改为dgram.createSocket（{type:'udp4'，reuseAddr:true}）
您将能够删除主机
变量，并消除单个mahine上的EADDRINUSE错误。