[OASIS Issue Tracker] Commented: (MQTT-7) Can the client and server store QoS=0 messages after a client using CleanSession=0 has disconnected?

[ http://tools.oasis-open.org/issues/browse/MQTT-7?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=33354#action_33354 ] 

Nick O'Leary commented on MQTT-7:
---------------------------------

I am in favour of allowing qos 0 to be stored, if desired, for disconnected clients - but that it not be required.

In other words, for a CleanSession=0 client:
 - the client/server MUST store qos 1/2 messages, including those new messages due to active subscriptions on the server
 - the client/server MAY discard QoS 0 messages


> Can the client and server store QoS=0 messages after a client using CleanSession=0 has disconnected?
> ----------------------------------------------------------------------------------------------------
>
>                 Key: MQTT-7
>                 URL: http://tools.oasis-open.org/issues/browse/MQTT-7
>             Project: OASIS Message Queuing Telemetry Transport (MQTT) TC
>          Issue Type: Improvement
>            Reporter: Andrew Banks
>
> Can the client and server store QoS=0 messages after a client using CleanSession=0 has disconnected
> or must these messages be discarded. If they must be discarded then a temporary network outage will unnecessarily cause Qos=0 messages to lost.

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