Procedure: (on ubuntu)

1. Install node.js: 

sudo apt-get install python-software-properties
sudo add-apt-repository ppa:chris-lea/node.js
sudo apt-get update
sudo apt-get install nodejs 

2. Install npm (node package manager):

sudo apt-get install npm

3. Install the aforementioned modules (first "cd" to you project directory)
npm install serialport
npm install socket.io @0.9.14

4. Install localtunnel

sudo apt-get install ruby ruby1.8-dev rubygems1.8 libopenssl-ruby

sudo gem install localtunnel

Running the server:

The server will run on port 8080 (you can change this in the server.js file if required)

Run server : node index.html (first cd to your project directory)
locatunnel :  lt --port 8080

The localtunnel will generate a subdomain for you and you can use that to access your website anywhere.