Communication between Nodejs http server and net server - node.js

Question

In here I have a http server and a net server on the same file. The net server connects to Arduino. I want to show the data received from Arduino on the http server website. Also when a button is pressed on the website, I want to send some data through the net server to the arduino. How can I do that.
var http = require("http");
var url = require('url');
var fs = require('fs');
var ip = require('ip');
var net = require('net');
var colors = require('colors');
var formidable = require('formidable');
var HOST = ip.address();//my IP address
var HTTP_PORT = 4321;
var NET_PORT = 1234;
var NAME;
var backButton;
var _p1 = '<form role="form" action="enext" method="post" enctype="multipart/form-data">'
+ '<h1>'
+ '=== Arduino Data Online ==='
+ '</h1><br><h2>'
+ 'Arduino data: ';
var _msg = 'sock data';
var _p2 = '</h2><br><br>'
+ '<h3>'
+ 'Press NEXT after fp success'
+ '</h3><br><b>'
+ '<button type="submit">'
+ 'NEXT'
+ '</button></form>';
//socket
function func(sock) {
console.log(colors.cyan('CONNECTED: ' + sock.remoteAddress + ':' + sock.remotePort));
// Add a 'data' event handler to this instance of socket
sock.on('data', function (data) {
////========
console.log(data);
});
// Add a 'close' event handler to this instance of socket
sock.on('close', function (data) {
console.log(colors.cyan('CLOSED: ' + sock.remoteAddress + ' ' + sock.remoteNET_PORT));
console.log("");
httpserver.close();
});
sock.on('error', function (data) {
console.log(colors.magenta("clnt error"));
httpserver.close();
});
}
net.createServer(func).listen(NET_PORT, HOST);
console.log(colors.yellow('Server listening on ' + HOST + ':' + NET_PORT));
var httpserver = http.createServer(function (request, response) {
var path = url.parse(request.url).pathname;
console.log('CONNECTED');
console.log(path);
switch (path) {
case '/':
response.writeHead(200, { "Content-Type": "text/html" });
response.write(_p1, "utf8");
response.write(_msg, "utf8");
response.write(_p2, "utf8");
response.end();
break;
default:
response.writeHead(404);
response.write("opps this doesn't exist - 404");
response.end();
break;
}
});
httpserver.listen(HTTP_PORT, HOST);
console.log('http://Server # ' + HOST + ':' + HTTP_PORT);