Re: [mqtt] [OASIS Issue Tracker] Created: (MQTT-15) Should the CONNECT packet Protocol Name and Protocol Version fields be changed?

I have opened this issue to start a discussion
on what the TC thinks should be done regarding changes to the CONNECT packet,
specifically regarding the Protocol Name and Protocol Version fields. If
we are anticipating behavioural, or other changes that would break interoperability
between current clients/servers and those that are conformant to the spec
we release, or for auditability and firewall discrimination reasons such
as Raph suggested on the last call, it would seem appropriate to look at
changing these values. The proposal included should be treated as the starting
point for this discussion rather than necessarily a complete solution.

Thanks,

Allan Stockdill-Mander, GCFA

Websphere MQ

Phone: +44 1962 815415 (37245415 Internal)

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Date:      
 22/05/2013 13:16

Subject:    
   [mqtt] [OASIS
Issue Tracker] Created: (MQTT-15) Should the CONNECT packet Protocol Name
and Protocol Version fields be changed?

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Should the CONNECT packet Protocol Name and Protocol
Version fields be changed?

-------------------------------------------------------------------------------

                 Key: MQTT-15

                 URL: http://tools.oasis-open.org/issues/browse/MQTT-15

             Project: OASIS Message Queuing
Telemetry Transport (MQTT) TC

          Issue Type: Improvement

          Components: core

            Reporter: Allan Stockdill-Mander

The draft specification states that the Bytes 1 to 9 of the variable header
section of the CONNECT packet are currently a spec encoded string (2 prefix
bytes indicating the string length followed by the string data) containing
the letters 'MQIsdp' followed by the number 3. Changing these fields would
be an easy way to differentiate between old and OASIS spec compliant clients.

Reasons for wanting to differentiate between clients include using discrimination
of access to MQTT servers and understanding/implementing behavioural differences.

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