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https://issues.apache.org/jira/browse/AMQ-5886?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Timothy Bish updated AMQ-5886:
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Fix Version/s: 5.13.4
> AMQ accepts illegal MQTT protocol level (5, only 3 and 4 are defined)
> ---------------------------------------------------------------------
>
> Key: AMQ-5886
> URL: https://issues.apache.org/jira/browse/AMQ-5886
> Project: ActiveMQ
> Issue Type: Bug
> Affects Versions: 5.11.1
> Environment: OSX 10.10
> https://github.com/ckrey/MQTT-Client-Framework testcases
> Reporter: Christoph Krey
> Assignee: Timothy Bish
> Priority: Minor
> Fix For: 5.14.0, 5.13.4
>
>
> MQTT spec says:
> [MQTT-3.1.2-2]
> The Server MUST respond to the CONNECT Packet with a CONNACK return code 0x01
> (unacceptable protocol level) and then disconnect the Client if the Protocol
> Level is not supported by the Server.
> [MQTT-3.2.2-5]
> If a server sends a CONNACK packet containing a non-zero return code it MUST
> then close the Network Connection.
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