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Subject: MQTT v5.0 RETAIN optional

Dear committee members,

I may be a bit late in the process, but I am very concerned about the future direction of MQTT:

RETAINed messages have always been a key feature of MQTT and are substantial for applications which
do not want to implement a secondary transport to modify or query status information.

Your current working draft #11 shows the broker support of RETAINed messages and wills as „MAY“ while 
MQTT3.1.1 insists on a „MUST“ for a broker to be compliant.

I know that a number of major IoT platforms decided not to make RETAIN available over MQTT
(e.g. AWS IoT, IBM IoT Foundation Services).

Please review your decision to make support or RETAINed messages optional. Otherwise I see
- interoperability issues between applications and brokers (think bridging)
- more complex client application
- 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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