This is a simple websocket client using https://github.com/Worlize/AS3WebSocket

as3websocketclient.as

package
{

  import flash.display.Sprite;

	import com.worlize.websocket.WebSocket;
	import com.worlize.websocket.WebSocketEvent;
	import com.worlize.websocket.WebSocketErrorEvent;

	public class Main extends Sprite
	{
		private var _socket:WebSocket;

		public function Main()
		{
			trace('[client] started');
			_socket = new WebSocket('ws://localhost:5001', '*');
			_socket.addEventListener(WebSocketEvent.CLOSED, onClosed);
			_socket.addEventListener(WebSocketEvent.OPEN, onOpen);
			_socket.addEventListener(WebSocketEvent.MESSAGE, onMessage);
			_socket.addEventListener(WebSocketErrorEvent.CONNECTION_FAIL, onFail);	
			_socket.connect();
		}
	
		protected function onClosed(event:WebSocketEvent):void
		{
			trace('[client] connection closed');
		}

		protected function onOpen(event:WebSocketEvent):void
		{
			trace('[client] connection open');
			_socket.sendUTF('3|Hello');
		}

		protected function onMessage(event:WebSocketEvent):void
		{
			trace('[server] ' + event.message.utf8Data);
		}

		protected function onFail(event:WebSocketErrorEvent):void
		{
			trace('[client] connection failed');
		}

	}
}