NodeDCHelloNodeModules

client.js

var dgram = require('dgram');

var client = dgram.createSocket("udp4");

function sendNumber(number){
    console.log('sending... '  + number);
    var message = new Buffer(number.toString());
    client.send(message, 0, message.length, 41234, "192.168.1.243", function(err, bytes) {
          sendNumber(number + 1);
    });
};

sendNumber(0);

server.js

var dgram = require("dgram");

var server = dgram.createSocket("udp4");

var clientMap = [];

server.on("error", function (err) {
    console.log("server error:\n" + err.stack);
    server.close();
});

server.on("message", function (msg, rinfo) {
    console.log("server got: " + msg + " from " + rinfo.address + ":" + rinfo.port);
    var clientId = rinfo.address + ":" + rinfo.port;
    if(!clientMap[clientId]){
        clientMap[clientId] = {
            id:clientId,
            currentNumber:parseInt(msg)
        }
    } else {
        //verify that the currentNumber is one + the previous number
        if(clientMap[clientId].currentNumber > parseInt(msg)){
            console.error("client: " + clientId + " missed the number: " + clientMap[clientId].currentNumber + 1);
        } else {
            clientMap[clientId].currentNumber = parseInt(msg);
        }
    }
});

server.on("listening", function () {
    var address = server.address();
    console.log("server listening " + address.address + ":" + address.port);
});

server.bind(41234);
console.log('listening on 41234...');
// server listening 0.0.0.0:41234