[OASIS Issue Tracker] Updated: (MQTT-88) Clarify semantics of a SUBSCRIBE that contains multiple Topic Filters

[ http://tools.oasis-open.org/issues/browse/MQTT-88?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Peter Niblett updated MQTT-88:
------------------------------

    Proposal: 
Add the following text into the description of SUBSCRIBE

If a server receives a SUBSCRIBE packet that contains multiple topic filters it  MUST handle that packet as if it had received a sequence of multiple SUBSCRIBE packets, except that it combines their responses into a single SUBACK response.

Add the following text to the description of  UNSUBSCRIBE

If a server receives an UNSUBSCRIBE packet that contains multiple topic filters it  MUST handle that packet as if it had received a sequence of multiple UNSUBSCRIBE packets, except that it sends just one UNSUBACK response.



  was:A subscribe or unsubscribe packet containing multiple topic filters is treated by the server as if multiple subscribe or unsubscribe packets, were received and then the response combined.


> Clarify semantics of a SUBSCRIBE that contains multiple Topic Filters
> ---------------------------------------------------------------------
>
>                 Key: MQTT-88
>                 URL: http://tools.oasis-open.org/issues/browse/MQTT-88
>             Project: OASIS Message Queuing Telemetry Transport (MQTT) TC
>          Issue Type: Improvement
>          Components: core
>    Affects Versions: 3.1.1
>            Reporter: Peter Niblett
>             Fix For: 3.1.1
>
>
> The Subscribe packet is allowed to contain more than one Topic Filter.  It is not clear whether 
> 1. This is just a convenience, allowing clients to combine multiple subscribe requests into a single Control Packet, thus saving network traffic, or
> 2. There is some additional semantic implied by the presence of two or more topic filters in a single packet (e.g. that they must all be granted if any of them is granted)

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