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Subject: Wildcard Subsriptions, QoS 1 / 2 optional

Dear committee members,

Wildcard Subscriptions and QoS 1 and 2 have always been key features of MQTT.

You leave it to the decision of the broker implementors to make QoS 1 or QoS 2 available.

The existence of a Return Code "0xA2 Wildcard Subscription not support“ suggests that the
implementation of wildcard subscriptions is another „MAY“ for brokers.

Would you include in the v5 specification a section were all features which became optional compared to MQTT3.1.1.
And for the broader audience, it would be very helpful to understand why you made such proposals.

Please review your decision. Otherwise I see
- interoperability issues between applications and brokers (think bridging)
- more complex client applications
- a decrease in the use of MQTT

Christoph Krey
<c@ckrey.de> 7582 9188 8D6C E945 15BA  4CD9 900D FB34 2AB0 38D7
Breite Strasse 79, 41460 Neuss, Germany
+49 1511 874 4526

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