What's the granted QoS for SUBACK if subscribing to a topic that is NOT permitted (MQTT v3.1 spec) ?

[张斌]

hi,

What's the granted QoS for SUBACK if subscribing to a topic that is NOT permitted by a MQTT broker (MQTT v3.1 spec) ?

e.g. 

Subscribe to topic1, but it's NOT permitted by the broker, what's the granted QoS should be returned in this case?

Thanks,

Bin

[Paul Fremantle]

MQTT 3.1.1 makes this clear:

0x80 - Failure

Paul

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Paul Fremantle

Part-time PhD student - School of Computing

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CTO and Co-Founder, WSO2
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[张斌]

 Thanks Paul.

 I'm do aware v3.1.1 is clear.  but backward compatibility is needed.

 But for v3.1 what's the granted QoS in this case ? 

[Nicholas O'Leary]

In 3.1 you need to return a valid QoS value (0,1 or 2). There is not a specific value required in this scenario.

Nick

On 3 Apr 2014 17:49, "张斌" <gem...@gmail.com> wrote:

 Thanks Paul.

 I do aware v3.1.1 is clear.  

 But for v3.1 what should we return in this case, since backward compatibility is needed ?

[张斌]

 Thanks Nick.