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Re: [Ace] draft-ietf-ace-mqtt-tls-profile-03

Cigdem Sengul <cigdem.sengul@gmail.com> Tue, 25 February 2020 14:10 UTC

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From: Cigdem Sengul <cigdem.sengul@gmail.com>
Date: Tue, 25 Feb 2020 14:10:10 +0000
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To: Hannes Tschofenig <Hannes.Tschofenig@arm.com>
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Subject: Re: [Ace] draft-ietf-ace-mqtt-tls-profile-03
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Hello Hannes,

We used  broker as it is a widely accepted term in the MQTT Community for
"server" e.g.,
majority of the provider would list also a broker implementation to refer
to their server implementation.

With respect to whether 3.1,1 clients talking to v5, there may be some
issues. This is what the spec says:


*Non-normative Comment*

If the Server distributes Application Messages to Clients at different
protocol levels (such as MQTT V3.1.1) which do not support properties or
other features provided by this specification, some information in the
Application Message can be lost, and applications which depend on this
information might not work correctly.


The spec also defines a protocol version error message:

If the [Client's] Protocol Version [in the CONNECT packet] is not 5 and the
Server does not want to accept the CONNECT packet, the Server MAY send a
CONNACK packet with Reason Code 0x84 (Unsupported Protocol Version) and
then MUST close the Network Connection

So, whether a broker provides dual support would depend on the provider.
E.g., the Mosquitto broker supports the different protocol versions.

Thanks,
--Cigdem

On Tue, Feb 25, 2020 at 10:01 AM Hannes Tschofenig <
Hannes.Tschofenig@arm.com> wrote:

> Hi Cigdem, Hi Anthony, Hi Paul,
>
> Why are you using the term MQTT broker? My understanding of the MQTT spec
> is that there are only clients and servers - nothing more.
>
> Is a MQTT v3.1.1 client able to talk to a MQTT v5 server? Would a MQTT
> v3.1.1 client talk to a MQTT v5 client via a server that supports both
> v3.1.1 and v5?
>
> Ciao
> Hannes
>
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