[OASIS Issue Tracker] (MQTT-233) Modify Language around use of $ topics

Marco Carrer created MQTT-233:
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             Summary: Modify Language around use of $ topics
                 Key: MQTT-233
                 URL: https://tools.oasis-open.org/issues/browse/MQTT-233
             Project: OASIS Message Queuing Telemetry Transport (MQTT) TC
          Issue Type: Improvement
          Components: edits
    Affects Versions: 3.1.1
         Environment: All
            Reporter: Marco Carrer
            Priority: Critical


Section 4.7.2 Topics beginning with $ states 'The Server SHOULD prevent Clients from using such (where 'such' means topics beginning with $) Topic Names to exchange messages with other Clients'.  We think this is a bit restrictive and should not necessarily be strictly enforced by the broker.  

Instead we would prefer the 'SHOULD' be changed to a 'MAY'. This is consistent with the Non normative comment which states that "Applications cannot use a topic with a leading $ character for their own purposes".

We would prefer a language that leads broker implementations to may allow the use of $ topic namespaces through configurable options rather block such topics in an hard-coded way.




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