[OASIS Issue Tracker] Created: (MQTT-65) Should the QoS flag for PUBREL, SUBSCRIBE and UNSUBSCRIBE be reserved ?

[OASIS Issues Tracker <workgroup_mailer@lists.oasis-open.org>]

Should the QoS flag for PUBREL, SUBSCRIBE and UNSUBSCRIBE be reserved ?
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                 Key: MQTT-65
                 URL: http://tools.oasis-open.org/issues/browse/MQTT-65
             Project: OASIS Message Queuing Telemetry Transport (MQTT) TC
          Issue Type: Improvement
          Components: core
    Affects Versions: 3.1.1
            Reporter: Richard Coppen
             Fix For: 3.1.1


The current spec is ambiguous with respect to the acceptable values of the QoS flag for PUBREL, SUBSCRIBE and UNSUBSCRIBE operations.
It could be interpreted that QoS must be set to 1 to force an appropriate ACK. However the ACK behavior is described independently.

do we accept only one value ?
if so, should it be 0, 1 or 2?
Are other values be treated as malformed?

Forcing 0 would change the protocol flow on the wire. 
Forcing 1 is consistent with the spirit of the input spec, but we need some clarity. The intended ACK behavior is not really related to QoS. 



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