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Subject: [OASIS Issue Tracker] (MQTT-305) Metadata: Add User defined PUBLISH tags

    [ https://issues.oasis-open.org/browse/MQTT-305?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=63599#comment-63599 ] 

Konstantin Dotchkoff commented on MQTT-305:

Proposal for encoding custom metadata :
A specific optional field Id is introduced for custom metadata. Unlike other optional fields (which are defined with a specific data type for the value), the custom field Id is followed by two strings in an MQTT packet. The first string represents a custom name for the optional field and the second string is used for the value.
In an MQTT packet the custom field Id can be repeated, which allows to include multiple custom metadata fields in a single MQTT packet.

> Metadata: Add User defined PUBLISH tags
> ---------------------------------------
>                 Key: MQTT-305
>                 URL: https://issues.oasis-open.org/browse/MQTT-305
>             Project: OASIS Message Queuing Telemetry Transport (MQTT) TC
>          Issue Type: New Feature
>          Components: core
>    Affects Versions: 5
>            Reporter: Ed Briggs
>            Assignee: Ed Briggs
> This was discussed in MQTT-276 with notes from the F2F meetings and has been tracked in MQTT-256.
> I'm opening a separate, specific issue per Ken's comments - https://issues.oasis-open.org/browse/MQTT-256?focusedCommentId=62192page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-62192:
> "All of these would be defined in separate JIRAs, but what we should do in this JIRA is to define the mechanism used to pass these values." 

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