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Processing Code for Text Chat using Socket Connections

import processing.core.PApplet;
import processing.core.PFont;
import processing.net.Client;
import processing.net.Server;
import processing.serial.Serial;

public class Chat extends PApplet {



	Server myServer;

	int endOfMessageChar = 10;

	Client myClient;

	int socketPort = 10002;

	String ip = "128.122.151.100";

	boolean serverRole = true;

	String displayText = "Nothing Yet";

	static String[] args;

	String testString = "";

	static public void main(String _args[]) {
		args = _args;
		PApplet.main(new String[] { "Chat" });
	}

	public void setup() {
		size(256, 256); // Stage size
		noStroke(); // No border on the next thing drawn
		// Print a list of the serial ports, for debugging purposes to find out what your ports are called:
		// println(Serial.list());
		getParams();
		if (serverRole) {
			myServer = new Server(this, socketPort);
			println("Starting a server at port " + socketPort);
		} else {
			myClient = new Client(this, ip, socketPort);
			println("Connecting as client at " + socketPort + " on " + ip);
		}
		PFont myFont = createFont("Arial", 18);
		textFont(myFont);
	}

	public void draw() {
		// listen to client, should be able to do this with ClientEvent but this seems not to work with Clients created by the server
		if (myClient != null) {
			String whatClientSaid = myClient.readStringUntil(endOfMessageChar);
			if (whatClientSaid != null) {
				displayText = "Got: " + whatClientSaid;
			}
		}

		background(0);
		if (testString.equals("")) {
			text(displayText, 20, 20);
		} else {
			text(testString + " Press Enter To Send", 20, 20);
		}
	}

	public void serverEvent(Server someServer, Client _newClient) {
		myClient = _newClient;
		println("We have a new client: " + _newClient.ip());
	}


	void tellSocket(String _whatSerialSaid) {
		displayText = "Told Socket " + _whatSerialSaid;
		if (myClient != null) myClient.write(_whatSerialSaid + "\n");
	}



	public void keyPressed() {
		if (key == ENTER || key == RETURN) {
			tellSocket(testString);
			testString = "";
		} else {
			testString = testString + key;
		}
	}

	void getParams() {
		if (args != null) { // running as an application

			if (args.length > 0) socketPort = Integer.parseInt(args[0]);
			if (args.length > 1) {
				ip = args[1];
				serverRole = false;
			}
		} else { // running as an applet


			String isItThere = getParameter("socketPort");
			if (isItThere != null) socketPort = Integer.parseInt(isItThere);
			isItThere = getParameter("ip");
			if (isItThere != null) ip = isItThere;

		}
	}

}

Processing Code for Tele White Board

import processing.core.PApplet;
import processing.core.PFont;
import processing.net.Client;
import processing.net.Server;
import processing.serial.Serial;

public class TeleDraw extends PApplet {

	Server myServer;

	int endOfMessageChar = 10;

	Client myClient;

	int socketPort = 10002;

	String ip = "128.122.151.100";

	boolean serverRole = true;

	static String[] args;

	static public void main(String _args[]) {
		args = _args;
		PApplet.main(new String[] { "TeleDraw" });
	}

	public void setup() {
		size(256, 256); // Stage size
		noStroke(); // No border on the next thing drawn
		// Print a list of the serial ports, for debugging purposes to find out what your ports are called:
		// println(Serial.list());
		getParams();
		if (serverRole) {
			myServer = new Server(this, socketPort);
			println("Starting a server at port " + socketPort);
		} else {
			myClient = new Client(this, ip, socketPort);
			println("Connecting as client at " + socketPort + " on " + ip);
		}

	}

	public void draw() {
		// listen to client, should be able to do this with ClientEvent but this seems not to work with Clients created by the server
		if (myClient != null) {
			String whatClientSaid = myClient.readStringUntil(endOfMessageChar);
			if (whatClientSaid != null) {
				println("What " +  serverRole + " " + whatClientSaid);
				String[] parts = whatClientSaid.split(",");
				if (parts.length > 1) {
					fill(0);
					ellipse(Integer.parseInt(parts[0].trim()), Integer.parseInt(parts[1].trim()), 2, 2);
				}
			}
		}

	}

	public void serverEvent(Server someServer, Client _newClient) {
		myClient = _newClient;
		println("We have a new client: " + _newClient.ip());
	}

	void tellSocket(String _whatSerialSaid) {
		if (myClient != null) myClient.write(_whatSerialSaid + "\n");
	}

	public void mouseDragged() {
		println(String.valueOf(mouseX) + "," + String.valueOf(mouseY));
		tellSocket(String.valueOf(mouseX) + "," + String.valueOf(mouseY));
	}

	void getParams() {
		if (args != null) { // running as an application
			if (args.length > 0) socketPort = Integer.parseInt(args[0]);
			if (args.length > 1) {
				ip = args[1];
				serverRole = false;
			}
		} else { // running as an applet

			String isItThere = getParameter("socketPort");
			if (isItThere != null) socketPort = Integer.parseInt(isItThere);
			isItThere = getParameter("ip");
			if (isItThere != null) ip = isItThere;

		}
	}

}

Arduino and Processing Code for Relaying Sensor Data Across the Internet

int ledPin = 3;                 // LED connected to digital pin 13
int photocell = 0;
boolean  lastPhotocellCondition;
boolean pinCondition = false;
int photoThreshold = 450;


void setup()
{
  pinMode(ledPin, OUTPUT);      // sets the digital pin as output
  beginSerial(9600);
}

void loop()
{
  photocell = analogRead(4);
   //Serial.println(photocell,DEC);
  boolean now = (photocell > photoThreshold);

  if (now != lastPhotocellCondition) {
    if (now == true){
      Serial.print(65,BYTE);
      Serial.print(10,BYTE);
    }
    else{
      Serial.print(66,BYTE);
      Serial.print(10,BYTE);
    }
    lastPhotocellCondition  = now;
  }
  if (Serial.available() > 1){
    int condition = Serial.read();
    Serial.read();  //burn the delimiter
    if (condition == 65){
      digitalWrite(ledPin, HIGH);   // sets the LED on
    }
    else{
      digitalWrite(ledPin, LOW);   // sets the LED on
    }       
  } 
}






import processing.core.PApplet;
import processing.core.PFont;
import processing.net.Client;
import processing.net.Server;
import processing.serial.Serial;

public class SerialServerApp extends PApplet {

	Serial serialPort;

	Server myServer;

	int endOfMessageChar = 10;

	Client myClient;

	String serialPortName;

	int socketPort = 10002;

	String ip = "128.122.151.100";

	boolean serverRole = true;

	String displayText = "Nothing Yet";

	static String[] args;

	String testString = "";

	static public void main(String _args[]) {
		args = _args;
		PApplet.main(new String[] { "SerialServerApp" });
	}

	public void setup() {
		size(256, 256); // Stage size
		noStroke(); // No border on the next thing drawn
		// Print a list of the serial ports, for debugging purposes to find out what your ports are called:
		// println(Serial.list());
		getParams();
		if (Serial.list()[0] == null) serialPortName = Serial.list()[0];
		serialPort = new Serial(this, serialPortName, 9600); // or you can just specify it
		println("Connecting to serial port " + serialPortName);
		if (serverRole) {
			myServer = new Server(this, socketPort);
			println("Starting a server at port " + socketPort);
		} else {
			myClient = new Client(this, ip, socketPort);
			println("Connecting as client at " + socketPort + " on " + ip);
		}
		PFont myFont = createFont("Arial", 18);
		textFont(myFont);
	}

	public void draw() {
		// listen to client, should be able to do this with ClientEvent but this seems not to work with Clients created by the server
		if (myClient != null) {
			String whatClientSaid = myClient.readStringUntil(endOfMessageChar);
			if (whatClientSaid != null) {
				whatClientSaid = whatClientSaid.trim();
				tellSerial(whatClientSaid);
			}
		}

		background(0);
		if (testString.equals("")) {
			text(displayText, 20, 20);
		} else {
			text(testString + " Press Enter To Send", 20, 20);
		}
	}

	public void serverEvent(Server someServer, Client _newClient) {
		myClient = _newClient;
		println("We have a new client: " + _newClient.ip());
	}

	public void serialEvent(Serial port) {

		String whatSerialSaid = serialPort.readStringUntil(endOfMessageChar); // make sure you return (Ascii 13) at the end of your transmission

		//println("Serial " + whatSerialSaid);
		if (whatSerialSaid != null) {

			whatSerialSaid = whatSerialSaid.trim();
			tellSocket(whatSerialSaid);
		}
	}

	void tellSocket(String _whatSerialSaid) {
		displayText = "Told Socket " + _whatSerialSaid;
		if (myClient != null) myClient.write(_whatSerialSaid + "\n");
	}

	void tellSerial(String _whatSocketSaid) {
		displayText = "Told Serial " + _whatSocketSaid;
		serialPort.write(_whatSocketSaid + "\n");
	}

	public void keyPressed() {
		if (key == ENTER || key == RETURN) {
			tellSocket(testString);
			testString = "";
		} else {
			testString = testString + key;
		}
	}

	void getParams() {
		if (args != null) { // running as an application
			if (args.length > 0) serialPortName = args[0];
			if (args.length > 1) socketPort = Integer.parseInt(args[1]);
			if (args.length > 2) {
				ip = args[2];
				serverRole = false;
			}
		} else { // running as an applet

			String isItThere = getParameter("serialPort");
			if (isItThere != null) serialPortName = isItThere;
			isItThere = getParameter("socketPort");
			if (isItThere != null) socketPort = Integer.parseInt(isItThere);
			isItThere = getParameter("ip");
			if (isItThere != null) ip = isItThere;

		}
	}

}