server.js

var net = require("net");

var packetTypes = {
    REQ_ID: 1,
    PLATFORM: 2,
    LOGIN: 3,
    ACCT_NO_EXIST: 4,
    UN_INCORRECT: 5,
    PW_INCORRECT: 6
};

var platformTypes = {
    WIIU: 1,
    WII: 2,
    PC: 3,
    RASPBERRYPI: 4
};

var nextID = 0;

var clients = []

net.createServer(function(socket){
    socket.on("data",function(data){
        console.log(data);
        if(data[0] == packetTypes.REQ_ID){
            var sendBuff = new Buffer([packetTypes.REQ_ID, nextID]);
            socket.write(sendBuff);
            nextID++;
        } else if(data[0] == packetTypes.PLATFORM){
            var clientID = data[1];
            if(data[2] == platformTypes.WIIU){
                pltfrm = "Wii U";
            } else if(data[2] == platformTypes.WII){
                pltfrm = "Wii";
            } else if(data[2] == platformTypes.PC){
                pltfrm = "PC";
            } else if(data[2] == platformTypes.RASPBERRYPI){
                pltfrm = "Raspberry Pi";
            }
            console.log("Client " + clientID + " Platform: " + pltfrm);
        } else if(data[0] == packetTypes.LOGIN){
            var clientID = data[1];
            var bufferChars = data.toString();
            var username = "";
            for(var i = 0; i < 20; i++){
                username += bufferChars.charAt(i + 2);
            }

            if(username != "atm959"){
                console.log("Account \"" + username + "\" doesn't exist!");
                var sendBuff = new Buffer([packetTypes.ACCT_NO_EXIST]);
                socket.write(sendBuff);
            }

            console.log("Client " + clientID + " username: " + username);
        }
    });

    socket.on("error",function(e){
        console.log("socket error:",e);
        socket.destroy();
    });
    socket.on("disconnect",function(){
        console.log("client sent disconnect event");
        socket.destroy();
    });
    socket.on("close",function(){
        console.log("socket closed");
        socket.destroy();
    });
}).listen(11000);