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https://issues.apache.org/jira/browse/AMQ-6345?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Christopher L. Shannon resolved AMQ-6345.
-----------------------------------------
Resolution: Fixed
Fix Version/s: 5.13.4
5.14.0
Fixed, an error will now occur for both 3.1 and 3.1.1 if a CONNECT packet
hasn't been received first.
> [MQTT] ping response without CONNECT
> ------------------------------------
>
> Key: AMQ-6345
> URL: https://issues.apache.org/jira/browse/AMQ-6345
> Project: ActiveMQ
> Issue Type: Bug
> Components: MQTT
> Affects Versions: 5.13.3
> Environment: Ubuntu Linux 14.04
> Reporter: Martin Tappler
> Assignee: Christopher L. Shannon
> Priority: Minor
> Fix For: 5.14.0, 5.13.4
>
>
> I am currently investigating the behavior of several MQTT brokers and noticed
> that the ActiveMQ broker responds to PINGREQ packets with PINGRESP packets
> even if no CONNECT packet has been sent before.
> This would be a violation of MQTT-3.1.0-1 and MQTT-4.8.0-1 of MQTT v3.1.1
> while MQTT v3.1 is not that strict about this issue, but does also state
> "When a TCP/IP socket connection is established from a client to a server, a
> protocol level session must be created using a CONNECT flow."
> (http://public.dhe.ibm.com/software/dw/webservices/ws-mqtt/mqtt-v3r1.html#connect)
> Since ActiveMQ supports MQTT v3.1 according to http://activemq.apache.org/,
> but also MQTT v3.1.1 according to Issue AMQ-4990, I am not sure whether this
> should actually be considered a bug.
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