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Scope: Core (OPC-10000-*) All specs

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OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub

7.3.4.8 Message header

interval expires. The MQTT version 3.1.1 protocol does not support message headers. Any promoted field or additional fields defined on the WriterGroup or DataSetWriter other than RETAIN are not sent ... encoded using the VerboseEncoding OPC UA JSON Data Encoding rules in OPC 10000-6 . Promoted fields can only be sent for fields which are assumed to be a MQTT User