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Subject: [OASIS Issue Tracker] (MQTT-550) Mandate the use of separate id spaces for device normal topic alias's


     [ https://issues.oasis-open.org/browse/MQTT-550?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Simon Johnson updated MQTT-550:
-------------------------------
    Proposal: 
Section changed and should read;

*7.3 Topic Name Aliasing and Mapping*
On the gateway the mapping table between registered topic ids and topic names is implemented per client (and not by a single shared pool between all clients), to reduce the risk of an incorrect topic id from a client matching another clientâs valid topic. For performance and efficiency reasons the broker may choose to align TopicIds for registered topic aliases between multiple clients. The mapping table of predefined topic aliases is separate from registered aliases. It is global and shared between all clients and gateways.

  was:
Section changed and should read;

*7.3 Topic Name Aliasing and Mapping*
On the gateway the mapping table between registered topic ids and topic names is implemented per client (and not by a single shared pool between all clients), to reduce the risk of an incorrect topic id from a client matching another clientâs valid topic. For performance and efficiency reasons the broker may choose to align TopicIds for registered topic aliases between multiple clients. The mapping table of predefined topic aliases is separate from registered aliases, it is global and shared between all clients and gateways.


> Mandate the use of separate id spaces for device normal topic alias's
> ---------------------------------------------------------------------
>
>                 Key: MQTT-550
>                 URL: https://issues.oasis-open.org/browse/MQTT-550
>             Project: OASIS Message Queuing Telemetry Transport (MQTT) TC
>          Issue Type: Improvement
>          Components: MQTT-SN
>    Affects Versions: MQTT-SN-1.2
>            Reporter: Simon Johnson
>            Assignee: Simon Johnson
>            Priority: Trivial
>              Labels: Implementation-notes
>
> The implementation notes strongly suggestâ using a separate id space per device for topicId mapping. 
> Suggest the implementation notes are explicit and mandate that device alias' exist in their own 0-65535 space and do not overlap with alias's used by other devices.



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