udpSocket.bind(); //bind to any available port, listen on all IPv4 addresses
udpSocket.bind( 0, "0.0.0.0" ); //same as above
udpSocket.bind( 0, "127.0.0.1" ); //any available port on the localhost address
udpSocket.bind( 8989, "192.168.0.1" ); //port 8989 on a particular IPv4 address
udpSocket.bind( 0, "::" ); //any available port on all IPv6 address
udpSocket.bind( 8989, "::1" ); //port 8989 on the IPv6 localhost address
udpSocket.bind( 8989, "2001:1890:110b:1e19:f06b:72db:7026:3d7a" ); //port 8989 on a particular IPv6 address

package
{
    import flash.display.Sprite;
	import flash.events.DatagramSocketDataEvent;
	import flash.events.Event;
	import flash.events.MouseEvent;
	import flash.events.TimerEvent;
	import flash.net.DatagramSocket;
	import flash.text.TextField;
	import flash.text.TextFieldAutoSize;
	import flash.text.TextFieldType;
	import flash.utils.ByteArray;
	import flash.utils.Timer;
	
	public class DatagramSocketExample extends Sprite
	{
		private var datagramSocket:DatagramSocket = new DatagramSocket();;

		private var localIP:TextField;
		private var localPort:TextField;
		private var logField:TextField;
		private var targetIP:TextField;
		private var targetPort:TextField;
		private var message:TextField;
		
		public function DatagramSocketExample()
		{
			setupUI();
		}

		private function bind( event:Event ):void
		{
			if( datagramSocket.bound ) 
			{
				datagramSocket.close();
				datagramSocket = new DatagramSocket();
				
			}
			datagramSocket.bind( parseInt( localPort.text ), localIP.text );
			datagramSocket.addEventListener( DatagramSocketDataEvent.DATA, dataReceived );
			datagramSocket.receive();
			log( "Bound to: " + datagramSocket.localAddress + ":" + datagramSocket.localPort );
		}
		
		private function dataReceived( event:DatagramSocketDataEvent ):void
		{
			//Read the data from the datagram
			log("Received from " + event.srcAddress + ":" + event.srcPort + "> " + 
				event.data.readUTFBytes( event.data.bytesAvailable ) );
		}
		
		private function send( event:Event ):void
		{
			//Create a message in a ByteArray
			var data:ByteArray = new ByteArray();
			data.writeUTFBytes( message.text );
			
			//Send a datagram to the target
			try
			{
				datagramSocket.send( data, 0, 0, targetIP.text, parseInt( targetPort.text )); 
				log( "Sent message to " + targetIP.text + ":" + targetPort.text );
			}
			catch ( error:Error )
			{
				log( error.message );
			}
		}
		
		private function log( text:String ):void
		{
			logField.appendText( text + "\n" );
			logField.scrollV = logField.maxScrollV;
			trace( text );
		}
		private function setupUI():void
		{
			targetIP = createTextField( 10, 10, "Target IP:", "192.168.0.1" );
			targetPort = createTextField( 10, 35, "Target port:", "8989" );
			message = createTextField( 10, 60, "Message:", "Lucy can't drink milk." );
			localIP = createTextField( 10, 85, "Local IP", "0.0.0.0");
			localPort = createTextField( 10, 110, "Local port:", "0" );
			createTextButton( 250, 135, "Bind", bind );
			createTextButton( 300, 135, "Send", send );
			logField = createTextField( 10, 160, "Log:", "", false, 200 )
				
			this.stage.nativeWindow.activate();
		}
		
		private function createTextField( x:int, y:int, label:String, defaultValue:String = '', editable:Boolean = true, height:int = 20 ):TextField
		{
			var labelField:TextField = new TextField();
			labelField.text = label;
			labelField.type = TextFieldType.DYNAMIC;
			labelField.width = 180;
			labelField.x = x;
			labelField.y = y;
			
			var input:TextField = new TextField();
			input.text = defaultValue;
			input.type = TextFieldType.INPUT;
			input.border = editable;
			input.selectable = editable;
			input.width = 280;
			input.height = height;
			input.x = x + labelField.width;
			input.y = y;
			
			this.addChild( labelField );
			this.addChild( input );
			
			return input;
		}
		
		private function createTextButton( x:int, y:int, label:String, clickHandler:Function ):TextField
		{
			var button:TextField = new TextField();
			button.htmlText = "<u><b>" + label + "</b></u>";
			button.type = TextFieldType.DYNAMIC;
			button.selectable = false;
			button.width = 180;
			button.x = x;
			button.y = y;
			button.addEventListener( MouseEvent.CLICK, clickHandler );
			
			this.addChild( button );
			return button;
			
		}
	}
}