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Subject: MQTT 5 spec - missing restrictions at


I believe the sections Payload Format Indicator and Message Expiry Interval miss a part:
Neither of these properties restrict the availability to a single instance, meaning that I can put multiple Payload Format Indicator or Message Expiry Interval into a publish message, which then may result conflicting parameters. I expected a restriction like in case of Topic Alias, which adds “ It is a Protocol Error to include the Topic Alias value more than once.”
Also, these properties are available for CONNECT packets when defining will messages ( – line 969 and – line 975) and those restrict the usage to a max single instance.

I am looking at this version:



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