SpringBoot STOMP Connection Closes Due to Missing Heartbeats Despite Frontend Showing Ping-Pongs

I’m experiencing a connection issue with WebSocket STOMP in Spring Boot using ActiveMQ Artemis. Despite proper heartbeat configurations, the broker closes the connection with the following error: AMQ229014: Did not receive data from /192.0.2.1:46748 within the 20000ms connection TTL.

Setup - Frontend: SockJS and Stomp.js, showing regular ping/pong exchanges in the browser console. - Backend: Spring Boot using StompBrokerRelayMessageHandler with custom ReactorNettyTcpClient for broker connections. Relevant configuration:

public void configureMessageBroker(MessageBrokerRegistry config) {
    int sendInterval = 10000; // Send interval in milliseconds
    int receiveInterval = (int) (sendInterval * heartBeatReceiveScale);
    config.setApplicationDestinationPrefixes("/app");
    config.enableStompBrokerRelay("/topic", "/queue")
            .setUserDestinationBroadcast("/topic/random")
            .setUserRegistryBroadcast("/topic/simp-user-registry")
            .setTcpClient(createTcpClient())
            .setSystemLogin(username)
            .setSystemPasscode(password)
            .setClientLogin(username)
            .setClientPasscode(password)
            .setSystemHeartbeatSendInterval(sendInterval) // Set heartbeat send interval
            .setSystemHeartbeatReceiveInterval(receiveInterval);
}

Logs confirm a CONNECTED frame with heart-beat=[10000, 10000].

Observations - Frontend pings/pongs appear consistent. - Backend logs indicate heartbeats are sent and received. - Connection closes after the TTL timeout (20 seconds).

Questions - How can I verify heartbeats are properly received by the broker? - Are additional Spring Boot or Artemis configurations required to prevent disconnections?

Steps to Reproduce - Configure WebSocket STOMP with a broker using the above setup. - Send/receive heartbeats with the specified intervals. - Observe connection closure in logs despite consistent heartbeats.

Additional Context Backend logs: DEBUG StompBrokerRelayMessageHandler : Received CONNECTED heart-beat=[10000, 10000] session=itwv0lto DEBUG StompBrokerRelayMessageHandler : Forwarding SEND /topic/simp-user-registry session=_system_

Comment From: wilkinsona

Duplicates https://github.com/spring-projects/spring-framework/issues/34009. @abhishek0499 please respect the maintainers' time by not opening the same issue in multiple repositories.