Github user orpiske commented on the issue:
https://github.com/apache/activemq-artemis/pull/1464
Sample output from running the modified Interceptor example:
```
server-out:MQTT Interceptor gets called
server-out:A MQTT control packet was intercepted CONNACK
server-out:MQTT Interceptor gets called
server-out:A MQTT control packet was intercepted CONNECT
server-out:A MQTT CONNECT control packet was intercepted
MqttConnectMessage[fixedHeader=MqttFixedHeader[messageType=CONNECT,
isDup=false, qosLevel=AT_MOST_ONCE, isRetain=false, remainingLength=34],
variableHeader=MqttConnectVariableHeader[name=MQIsdp, version=3,
hasUserName=false, hasPassword=false, isWillRetain=false, isWillFlag=false,
isCleanSession=true, keepAliveTimeSeconds=30],
payload=MqttConnectPayload[clientIdentifier=7f000001d5e85993fe7f,
willTopic=null, willMessage=null, userName=null, password=null]]
Connected to Artemis
server-out:MQTT Interceptor gets called
server-out:A MQTT control packet was intercepted SUBSCRIBE
Subscribed to topics.
server-out:MQTT Interceptor gets called
server-out:A MQTT control packet was intercepted PUBLISH
server-out:Original message: This is message 1
server-out:MQTT Interceptor gets called
server-out:A MQTT control packet was intercepted PUBLISH
server-out:Original message: Modified message
server-out:MQTT Interceptor gets called
server-out:A MQTT control packet was intercepted PUBREC
server-out:MQTT Interceptor gets called
server-out:A MQTT control packet was intercepted PUBREL
server-out:MQTT Interceptor gets called
server-out:A MQTT control packet was intercepted PUBCOMP
Sent message
Received message: Modified message
```
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