How to confirm websocket (spring websocket + stomp + sockjs) message delivery

Question

I am creating a simple client-server demo using websockets. In this demo client you can subscribe to various topics. Whenever the server has something to send, it will simply send a message on the relevant topic, and only signed clients will receive the same message.

My server should receive confirmation when sending a message on any topic, but I'm a little confused how to get this confirmation of a sent message when the sending method returns void

below is my WebSocketConfig class ,

@Configuration
@EnableWebSocketMessageBroker
public class WebSocketConfig extends AbstractWebSocketMessageBrokerConfigurer {

    @Override
    public void configureMessageBroker(MessageBrokerRegistry config) {
        config.enableSimpleBroker("/testApp");
        config.setApplicationDestinationPrefixes("/app");
    }

    @Override
    public void registerStompEndpoints(StompEndpointRegistry registry) {
        registry.addEndpoint("/message").withSockJS();
    }
}

The following shows how a subscription to a topic occurs on the client side.

var topic = '/testApp/testTopic';
stompClient.subscribe(topic, function(greeting){
});

, ,

 String message = "test message";
 this.template.convertAndSend(topic, new Chat(message));

(.. this.template.convertAndSend(topic, new Chat(message));) void

/ , , , ?