CONNACK error code for invalid will topic

[Ori Bar]

Some topic names are illegal in MQTT. What happens if a client sends a
CONNECT message to the MQTT server which contains an invalid will
topic (for example, the empty topic). There is no CONNACK return code
for this in the spec. How would you approach this?

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Best Regards,

Ori Bar, Software Engineer
Nivertech Ltd

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[Nicholas O'Leary]

Hi Ori,

> Some topic names are illegal in MQTT. What happens if a client sends a
> CONNECT message to the MQTT server which contains an invalid will
> topic (for example, the empty topic). There is no CONNACK return code
> for this in the spec. How would you approach this?

The best fit would be a return code of 0x03 - Broker Unavailable.

The alternative is to just drop the connection - which is what you
might considering doing for an invalid topic in a Publish, for
example.

Either way, it is not ideal as it won't help the client know what it
did wrong. Perhaps a job for the wiki will be to collate any other
reasons a connect could be rejected. They could then be considered in
the future for new CONNACK return code values.

Cheers,
Nick

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[Roger Light]

Hi,

I've created a page for suggested connack codes:
http://mqtt.org/wiki/doku.php/extended_connack_codes linked to from
http://mqtt.org/wiki/doku.php/mqtt_protocol

Cheers,

Roger

[Hiram Chirino]

That's awesome, but you know that Wiki registration is still broken right?  Is that on purpose?

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Hiram Chirino

Software Fellow | FuseSource Corp.

chi...@fusesource.com | fusesource.com

skype: hiramchirino | twitter: @hiramchirino

blog: Hiram Chirino's Bit Mojo

[Nicholas O'Leary]

Hi Hiram,

>> That's awesome, but you know that Wiki registration is still broken right?  Is that on purpose?

Sorry about that - nothing intentional with the breakage, just a lack of time to investigate between Andy and myself.

I will try to take a look tonight.

Regards,

Nick

[andyp...@gmail.com]

Absolutely not intentional, I've been starting a new role and had very little time to tweak mqtt.org lately - we will sort it asap. Apologies Hiram (and everyone!)

Andy Piper | Farnborough, Hampshire (UK)
blog: http://andypiper.co.uk   |   skype: andypiperuk
twitter: @andypiper  |  images: http://www.flickr.com/photos/andypiper