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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