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Subject: [OASIS Issue Tracker] Commented: (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:comment-tabpanel&focusedCommentId=35108#action_35108 ] 

Andrew Banks commented on MQTT-88:

Is the action atomic, if there is a partial failure do all of the subscribe , requests get cancelled?
What if one of the filters existed previously will a partial failure of the new request affect an existing subscription?

> 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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