fix: https://issues.apache.org/jira/browse/AMQ-4674 add transport options "?transport.hbGracePeriodMultiplier" which is used to add a user defined grace period to the read check interval indicated by the connecting STOMP client.
activemq/trunk/activemq-stomp/src/main/java/org/apache/activemq/transport/stomp/ProtocolConverter.java