Making Things Talk

144 MAKING THINGS TALK

Continued from previous page.

void keyReleased() {

// if any key is pressed, take the next step:

switch (step) {

case 0:

// open a connection to the server in question:

myPort.write("C208.201.239.37/80\r");

// add one to step so that the next keystroke causes the next step:

step++;

break;

case 1:

// send a HTTP GET request

myPort.write("GET /~igoe/index.html HTTP/1.0\n");

myPort.write("HOST:example.com\n\n");

step++;

break;

}

}

Write a Test Server Program

The previous program allowed you to connect

to a remote server and test the exchange of messages.

The remote server was beyond your control, however, so

you can’t say for sure that the server ever received your

messages. If you never made a connection, you have no

way of knowing whether the module can connect to any

server. To test this, you can write your own server program

for it to connect to.

/*

server_test

Language: Processing

Creates a server that listens for clients and prints what they say.

It also sends the last client anything that's typed on the keyboard.

*/

// include the net library:

import processing.net.*;

int port = 8080; // the port the server listens on

Server myServer; // the server object

Client thisClient; // incoming client object

void setup()

{

myServer = new Server(this, port); // Start the server

}

void draw()

{

// get the next cl