Making Things Talk

APPENDIX C 387

Test Server Program

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 client that sends a message:

Client speakingClient = myServer.available();

// if the message is not null, display what it sent:

if (speakingClient !=null) {

String whatClientSaid = speakingClient.readString();

// print who sent the message, and what they sent:

println(speakingClient.ip() + "\t" + whatClientSaid);

}

}

// ServerEvent message is generated when a new client

// connects to the server.

void serverEvent(Server myServer, Client someClient) {

println("We have a new client: " + someClient.ip());

thisClient = someClient;

}

void keyReleased() {

// only send if there's a client to send to:

if (thisClient != null) {

// if return is pressed, send newline and carriage feed:

if (key == '\n') {

thisClient.write("\r\n");

}

// send any other key as is:

else {

thisClient.write(key);

}

}

}

Chapter 5

Pong client

Language: Wiring/Arduino

This program enables an Arduino ...