How do I capture and log STOMP heart-beats sent by the clients and by the server?

I have SpringBoot configuration below for websockets using STOMP

@Configuration
@EnableWebSocketMessageBroker
public class WebSocketConfig implements WebSocketMessageBrokerConfigurer {

    @Override
    public void configureMessageBroker(MessageBrokerRegistry config) {
        ThreadPoolTaskScheduler taskScheduler = new ThreadPoolTaskScheduler();
        taskScheduler.setPoolSize(1);
        taskScheduler.setThreadNamePrefix("-api-heartbeat-thread-");
        taskScheduler.initialize();

        config.enableSimpleBroker("/topic")
                        .setHeartbeatValue(new long[]{25000, 25000})
                                .setTaskScheduler(taskScheduler);
        config.setApplicationDestinationPrefixes("/api");

    }

    @Override
    public void registerStompEndpoints(StompEndpointRegistry registry) {
        registry.addEndpoint("/api-websocket").setAllowedOrigins("*");
    }
}

1. A client should send a heart-beat every 25 seconds (25000 milliseconds). How can I capture and log this heartbeat in Spring Application?

2. The server is also supposed to send a heat-beat to the client every 25 seconds. How can I console.log(); this heart-beat in a Javascript application?

I might be missing something but I have searched extensively and could not find a solution.