[ https://tools.oasis-open.org/issues/browse/MQTT-204?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Richard Coppen updated MQTT-204:
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Proposal: The Server MUST NOT match Topic Filters starting with a wildcard character (# or +) with Topic Names beginning with a $ character. The Server SHOULD prevent Clients from using such Topic Names to exchange messages with other Clients. Server implementations MAY use Topic Names that start with a leading $ character for other purposes.
> Make $ topic separation normative
> ---------------------------------
>
> Key: MQTT-204
> URL: https://tools.oasis-open.org/issues/browse/MQTT-204
> Project: OASIS Message Queuing Telemetry Transport (MQTT) TC
> Issue Type: Improvement
> Components: core
> Reporter: Allan Stockdill-Mander
>
> Section 4.7.2.1 of wd-20 states;
> A Topic Filter that starts with a wildcard character (# or +) does not match Topic Names that begin with a $ character
> This appears to be a normative statement regarding server behaviour without any accompanying normative language.
> While server implementations may choose whether or not to implement predefined $topics I thought we explicitly did want separate all topics starting with $ from the rest of the topic space.
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