Buttons for robot control

In this section, we will add implement buttons to the web interface to drive the robot.

1. The first step is adding four buttons to index.html. We will be making use of HTML Table to add four buttons (Code snippet shortened for brevity and refer to http://www.w3schools.com/html/html_tables.asp for more information on HTML tables):

       <table style="width:100%; max-width: 500px; height:300px;"> 
         <tr> 
           <td> 
             <form action="/forward" method="POST"> 
               <input type="submit" value="forward" style="float:
               left; width:80% ;"> 
               </br> 
             </form> 
           </td> 
       ... 
       </table>

2. In web_interface.py, we need to implement a method that accepts POST requests from the buttons. For example, the method to accept requests from /forward can be implemented as follows:

       @app.route('/forward', methods = ['POST']) 
       def forward...