[jira] [Created] (AMQ-5997) MQTT legacy client support

["Dejan Bosanac (JIRA)" <ji...@apache.org>]

Dejan Bosanac created AMQ-5997:
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             Summary: 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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