[OASIS Issue Tracker] Commented: (MQTT-5) Should the unused DUP, QoS, and RETAIN flags be zero in the CONNECT message?

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    [ http://tools.oasis-open.org/issues/browse/MQTT-5?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=33321#action_33321 ] 

Raphael Cohen commented on MQTT-5:
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+1 for specifying them as zero. It makes things unambiguous.

Can anybody else think of any other places where similar restriction might be desired?

> Should the unused DUP, QoS, and RETAIN flags be zero in the CONNECT message?
> ----------------------------------------------------------------------------
>
>                 Key: MQTT-5
>                 URL: http://tools.oasis-open.org/issues/browse/MQTT-5
>             Project: OASIS Message Queuing Telemetry Transport (MQTT) TC
>          Issue Type: Improvement
>            Reporter: Andrew Banks
>
> Should the unused DUP, QoS, and RETAIN flags be zero in the MQTT Connect message? The current mqtt.org specification leaves this open. By 
> specifying that they must be zero we make it possible to put them to some use in the future.

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