private static WebSocketTransport createWebSocketTransport() {
HashMap<String, Object> webSocketOptions = new HashMap<>();
WebSocketClientFactory webSocketClientFactory = new WebSocketClientFactory();
try {
webSocketClientFactory.start();
} catch (Exception e) {
// Can't happen as WebSocketClientFactory.start() doesn't throw exceptions.
throw new AssertionError(e);
}
ScheduledExecutorService scheduler = null;