Intel Do-It-Yourself ChallengeThe network interface

Cdric Andreolliwww.Intel-Software-Academic-Program.com

paul.guermonprez@intel.comIntel Software

2013-02-08

Agenda

Agenda

Introduction

Using Java sockets

A threaded application

A small server

Conclusion

Introduction

Introduction

For now, we've seen how to control the pololu card with the phone.

Even if you can use the sensors, GPS, compass, accelerometer, internet, etc, to create a smart application that control your card, it is sometimes interesting to have a manual control.

This set of slides will help you expose the functionalities of the card through a network interface.

Using Java sockets

Using Java sockets

Java offers an efficient an simple way to manipulate network sockets.You can basically use 2 different classes : ServerSocket : allows you to accept incoming connections.Socket : Allows you to manipulate a socket, the connection can be done via the connect() method.

Using Java sockets

In addition to the philosophy that differs between the client socket (Socket) and the server socket (ServerSocket), there is a fundamental difference when using a ServerSocket and a socket.In order to connect to a ServerSocket, the IP of the device must be known and must be public.We also want to use our Android application over a 2G/3G/4G network.

Using Java sockets

The phone inside the 3G network can't be joined directly.

Using Java sockets

Because of this limitation (the phone inside the 3G network doesn't have a public IP), we can't use a ServerSocket.The solution is to use an intermediate server with a public IP. This server will use ServerSocket attributes and will tunneled the data. (see next slide)

Using Java sockets

Here is a scheme of the proposed solution :

Conclusion

Conclusion

Through the 2 previous set of slides, we've seen how to develop a server application that controls the pololu card via bluetooth or via USB.

Those course are also a good illustration of the Android course.

You should be able to program some nice Android applications right now !

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