[OASIS Issue Tracker] Created: (MQTT-16) Reserve $SYS topic name

Reserve $SYS topic name
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                 Key: MQTT-16
                 URL: http://tools.oasis-open.org/issues/browse/MQTT-16
             Project: OASIS Message Queuing Telemetry Transport (MQTT) TC
          Issue Type: Improvement
    Affects Versions: 3.1.1
            Reporter: David Locke
             Fix For: 3.1.1


Many MQTT implementations today use $SYS as the head of a topic string for use in administration  (configuration, operations, monitoring).   

Can the $SYS topic name be reserved?

Would be good to collect ideas for a $SYS topic space.  These ideas could initially go into a non-normative document but with potential for inclusion in a future spec.  The intent being servers can implement  some aspects of administration and monitoring in a consistent way

Some examples:
- Admin action like "unretain" a retained topic   e.g. $SYS/topic/unretain    (payload is the topic to unretain)
- Client wishes to query what subscriptions it has made    e.g. $SYS/client/getsubs  (topic is clientid)
- Client wishes to query how many messages are queued up awaiting delivery e.g. $SYS/client/getNoQueuedMessages  
- Query the  state of the MQTT server e.g. $SYS/server/getStatus 

These examples should not be taken literally they are purely to show the type of things a $SYS topic space could be used for.

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