Sessionless Networks - Making Things Talk - page 247

Continued from previous page.

void keyPressed() {
int port = 43770; // the destination port
String message = ", I'm talking to YOU!"; // the message to send
String ip = "255.255.255.255"; // the remote IP address

// send to different addresses depending on which key is pressed:
switch (key) {
case 'a': // broadcast query
message = "Calling all ducks!\n";
break;
case 'b': // directed query
ip = " 192.168.1.20 "; // the remote IP address
message = ip + message; // the message to send
break;
case 'c': // directed query
ip = " 192.168.1.30 "; // the remote IP address
message = ip + message; // the message to send
break;
}

8 You'll need to change
these numbers.

// send the message to the chosen address:
udp.send(message, ip, port );
}

void receive( byte[] data ) {
// print the incoming data bytes as ASCII characters:
for(int thisChar=0; thisChar < data.length; thisChar++) {
print(char(data[thisChar]));
}
println();
}