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https://issues.apache.org/jira/browse/AMQ-5997?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14943221#comment-14943221
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ASF subversion and git services commented on AMQ-5997:
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Commit b83c38b04c3e4330e6d5f57e4c5d7f3fd62942f0 in activemq's branch
refs/heads/master from [~dejanb]
[ https://git-wip-us.apache.org/repos/asf?p=activemq.git;h=b83c38b ]
https://issues.apache.org/jira/browse/AMQ-5997 - support legacy clients
> MQTT legacy client support
> --------------------------
>
> Key: AMQ-5997
> URL: https://issues.apache.org/jira/browse/AMQ-5997
> Project: ActiveMQ
> Issue Type: Improvement
> Affects Versions: 5.12.0
> Reporter: Dejan Bosanac
> Assignee: Dejan Bosanac
> Fix For: 5.13.0
>
>
> MQTT 3.1.1 spec defines that UNSUBSCRIBE packet needs to define AT_LEAST_ONCE
> (01) for fixed header QoS bits. But older clients might set those to some
> different value, like AT_MOST_ONCE. At the moment, the mqtt-client lib will
> try to have this case differently and we'll get
> {code}ProtocolException: Invalid message encoding{code}
> error.
> The solution is to make mqtt client parse these other values regularly and
> introduce the necessary checks for 3.1.1 spec version in the broker.
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