ServerLauncher.java

package com.github.czyzby;

import io.vertx.core.Vertx;
import io.vertx.core.http.HttpServer;

//Note that server web socket implementation is not provided by gdx-websocket. This class uses an external library: Vert.x.
public class ServerLauncher {
    public static void main(final String... args) throws Exception {
        System.out.println("Launching web socket server...");
        final Vertx vertx = Vertx.vertx();
        final HttpServer server = vertx.createHttpServer();
        server.websocketHandler(webSocket -> {
            // Printing received packets to console:
            webSocket.frameHandler(frame -> System.out.println("Received packet: " + frame.textData()));
            // Sending a simple message:
            webSocket.writeFinalTextFrame("Hello from server!");
            // Closing the socket in 5 seconds:
            vertx.setTimer(5000L, id -> webSocket.close());
        }).listen(8000);
    }
}