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Subject: [OASIS Issue Tracker] Commented: (MQTT-21) Use of flag bits in general.

    [ http://tools.oasis-open.org/issues/browse/MQTT-21?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=33662#action_33662 ] 

Rahul Gupta commented on MQTT-21:

This issue is an extension of problem described in MQTT-5 for CONNECT command message.

Command	         Fixed header DUP, QOS, RETAIN Flags used
------------------        ---------------------------------------------------------------
CONNECT	         NO                                                                                       -----> Issue discussed in MQTT-5
CONNACK	         NO
PUBLISH	         YES                                                                                     ------> not an issue
PUBACK	         NO
PUBREC	         NO
PUBREL	         YES                                                                                     ------> not an issue
PUBCOMP	         NO
SUSCRIBE	         YES                                                                                     ------> not an issue
SUBACK	         NO
UNSUBSCRIBE	 YES                                                                                     ------> not an issue
UNSUBACK	         NO
PINGREQ	         NO
PINGRESP	         NO

The issue is opened in general for fixed header flags (DUP, QOS, RETAIN) in nine other command messages. 

Also what should the receiver of these command messages do in case the bits are not set to zero and are malformed ? Do we need to discuss this as a  separate JIRA issue for different command messages ? 

Documentation currently done in WD-04  for CONNECT command message :
"Bits 3,2,1,0 are reserved for future use and MUST be set to zero by the client. The server MUST check that these bits are set to zero and disconnect the client if they are not set to zero."

Suggestions welcome .

> Use of flag bits in general.
> ----------------------------
>                 Key: MQTT-21
>                 URL: http://tools.oasis-open.org/issues/browse/MQTT-21
>             Project: OASIS Message Queuing Telemetry Transport (MQTT) TC
>          Issue Type: Improvement
>          Components: core
>            Reporter: Andrew Banks
> This extends issue 5 to all other commands.

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