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Subject: Re: [mqtt-comment] 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 whichdo 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“ whileMQTT3.1.1 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 MQTTCheersChristoph Krey<c@ckrey.de> 7582 9188 8D6C E945 15BA 4CD9 900D FB34 2AB0 38D7
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