CyberCuisineWebServer/src/main/java/CuisineHTTPServer.java

import io.undertow.Undertow;
import io.undertow.server.HttpHandler;
import io.undertow.server.HttpServerExchange;
import io.undertow.util.Headers;
import io.undertow.websockets.WebSocketConnectionCallback;
import io.undertow.websockets.core.AbstractReceiveListener;
import io.undertow.websockets.core.BufferedTextMessage;
import io.undertow.websockets.core.WebSocketChannel;
import io.undertow.websockets.core.WebSockets;
import io.undertow.websockets.spi.WebSocketHttpExchange;

import static io.undertow.Handlers.*;

public class CuisineHTTPServer extends Thread
{
    final int webPagePort = 8080;
    final int webSocketPort = 42069;
    final String HOST = "localhost" ;


    public void startServer()
    {
        //Create CuisineTCPServers
        CuisineTCPServer vTCPServer = new CuisineTCPServer();
        CuisineWebSocketMessageHandler vWebSocketMessageHandler         = new CuisineWebSocketMessageHandler( vTCPServer );
        CuisineWebSocketConnectionHandler vWebSocketConnectionHandler   = new CuisineWebSocketConnectionHandler( vWebSocketMessageHandler );

        //Start HTTP Server : serve webpage with JS that calls the websocket
        Undertow WebPageServer = Undertow.builder()
                .addHttpListener(webPagePort, HOST)
                .setHandler(
                        new CuisineResponseHandler()
                            ).build();
        WebPageServer.start();

        System.out.println("WebPageServer started");
        //Start websocket
        Undertow WebSocketServer = Undertow.builder()
            .addHttpListener(webSocketPort, HOST)
            .setHandler(
                path()
                    .addPrefixPath("/data",websocket(vWebSocketConnectionHandler))
            )
            .build();
        WebSocketServer.start();
        System.out.println("WebSocketServer started");

    }

    private class CuisineResponseHandler implements HttpHandler
    {

        @Override
        public void handleRequest(HttpServerExchange exchange) throws Exception {
            //Serve webpage
            exchange.getResponseHeaders().put(Headers.CONTENT_TYPE, "text/plain");
            exchange.getResponseSender().send("Salut, gropd!");
        }
    }

    private class CuisineWebSocketConnectionHandler implements WebSocketConnectionCallback
    {
        private CuisineWebSocketMessageHandler fWebSocketMessageHandler;

        protected CuisineWebSocketConnectionHandler(CuisineWebSocketMessageHandler iWebSocketMessageHandler)
        {
        fWebSocketMessageHandler = iWebSocketMessageHandler;
        }

        @Override
        public void onConnect(WebSocketHttpExchange exchange, WebSocketChannel channel) {
            channel.getReceiveSetter().set(fWebSocketMessageHandler);
            channel.resumeReceives();
        }
    }

    private class CuisineWebSocketMessageHandler extends AbstractReceiveListener {

        private CuisineTCPServer fTCPServer;

        protected CuisineWebSocketMessageHandler( CuisineTCPServer iTCPServer)
        {
        fTCPServer = iTCPServer;
        }

        protected void onFullTextMessage(WebSocketChannel iChannel, BufferedTextMessage iTextMessage)
        {
            //Handle message on webSocket
            WebSockets.sendText(String.valueOf(fTCPServer.getCurrentTemperature()), iChannel, null);
        }

    }
}