Amazon MQ ActiveMQ heartbeat never sent to client stomp php - php

Question

Summary
I am trying to set up heartbeats with my Consumer so it can detect a dropped connection - if the broker is rebooted for example so it may reconnect to the failover.
I tested the code with the Consumer/Dispatcher running locally and the queue running in AWS and everything worked fine. However, when moving the code to AWS the Consumer sets up heartbeats with the server/broker, but the heartbeat is either never sent by the server/broker or never received by the client/Consumer. As a result the HeartbeatException is thrown as soon as the requested server heartbeat interval has passed.
I based my code on the examples in the stomp-php-examples github
Repo: https://github.com/stomp-php/stomp-php-examples
Heartbeat example: https://github.com/stomp-php/stomp-php-examples/blob/support/version-4/src/heartbeats_server.php
My next best guess to as why this isn't working is something related to the queue config as I'm using the default config provided by AWS (I think). I have googled and searched all over about config settings for heartbeats but haven't got very far as this is a new topic. Any help would be appreciated!
Setup
Amazon MQ (ActiveMQ 5.15.14)
stomp-php 5.0 (latest version as of today)
I'm happy to provide any more details of my setup.
Code
Consumer (stripped down version)
abstract class AmqConsumerAbstract
{
/** #var StatefulStomp */
protected $consumer;
const HEARTBEAT = 5000;
public function listen(): void
{
$observer = new ServerAliveObserver();
$this->client->getConnection()->getObservers()->addObserver($observer);
$this->client->setHeartbeat(0, self::HEARTBEAT); // heartbeats setup here
// Note: the heartbeat above is longer than the read-timeout below
$this->client->getConnection()->setReadTimeout(2, 0);
$this->client->connect();
$this->consumer = new StatefulStomp($this->client);
$this->consumer->subscribe(
$this->getQueueName(),
null,
'client'
);
if (!$observer->isEnabled()) {
// we never get here so I assume everything is working OK
echo 'The Server is not supporting heartbeats.');
exit(1);
} else {
echo sprintf('The Server should send us signals every %d ms.', $observer->getInterval() * 1000);
}
try {
while (true) {
$frame = $this->consumer->read(); // I assumed this line would read the heartbeat?
// there is then some logic that deals with payload and does
// $this->consumer->begin();
// $this->consumer->ack($frame);
// $this->consumer->commit();
if ($observer->isDelayed()) {
$this->echoLog('ServerAliveObserver: Server has been delayed.');
}
}
} catch (HeartbeatException $e) {
echo 'AMQ (STOMP) Error, the server failed to send us heartbeats within the defined interval: ' . $e->getMessage()
$this->reconnect();
} catch (ConnectionException $e) {
echo $e->getMessage();
$this->reconnect();
} catch (Exception $e) {
echo 'AMQ (STOMP) Queue error: ' . $e->getMessage();
exit(1);
}
}
}
I have reproduced on a single-instance broker with version 5.15.14.
I have tried switching on STOMP debugging for the broker, but it appears the uri attribute under <transportConnector> is not allowed. The config will save but pulls out the uri attribute.
<transportConnector> Elements and Their Attributes Permitted in Amazon MQ Configurations
Working with Spring XML configuration files (xsd files)