Re: [mosquitto-dev] Topic aliasing on messages sent out by Mosquitto

[Vera Clemens <mail@xxxxxxxxxxxxxxx>]

Hi,

I believe I had the same feature request for Mosquitto a few months
ago, and I am also still interested in this. See my issue on GitHub
here: https://github.com/eclipse/mosquitto/issues/1757

The issue was recently closed by Roger. Maybe he could comment why.

Best regards

Vera

On Thu, 2021-03-18 at 10:33 +0100, Wiebe Cazemier via mosquitto-dev
wrote:
> Hi, 
> 
> (This is a resend of a mail sent on 2 June, 2020 16:40. It never got
> a reply, but I since then learned the list breaks DMARC and puts
> messages in spam. Also mailing Roger directly).
> 
> I've been able to successfully use topic aliases with Mosquitto
> 1.6.8, but only when initiating it as a publisher. Apparently, as a
> subscriber, you can't request that a broker use aliases for messages
> that are sent out? I suppose that's not part of the standard? Is it
> doable/desirable to be able to configure Mosquitto to attempt to use
> aliases when subscribers connect with 'topic-alias-maximum' set? 
> 
> And what about bridges? We also use Mosquitto as client and it would
> be very beneficial if we could make all the topics aliased. 
> 
> Regards, 
> 
> Wiebe 
> 
> 
> PS For illustration: 
> 
> If I publish, I can see the second message's 'null' topic: 
> 
> 
> # ./mosquitto_pub -V mqttv5 -u wiebe -P "$wiebepass" -h 127.0.0.1 -p
> 18883 --insecure -t 'R/asdf/adsf/asdf/asdf/' --property publish
> topic-alias 1 -d -l 
> Client (null) sending CONNECT 
> Client auto-6E67EB4C-C338-E189-EA8A-2F199A0F265D received CONNACK
> (0) 
> message one 
> Client auto-6E67EB4C-C338-E189-EA8A-2F199A0F265D sending PUBLISH (d0,
> q0, r0, m1, 'R/asdf/adsf/asdf/asdf/', ... (11 bytes)) 
> message two 
> Client auto-6E67EB4C-C338-E189-EA8A-2F199A0F265D sending PUBLISH (d0,
> q0, r0, m2, '(null)', ... (11 bytes)) 
> 
> 
> When I subscribe, I still see the topic: 
> 
> 
> # ./mosquitto_sub -V mqttv5 -u wiebe -P "$wiebepass" -h 127.0.0.1 -p
> 18883 --insecure -t '#' -v -d --property connect topic-alias-maximum
> 10 
> Client (null) sending CONNECT 
> Client auto-18E5C5B9-9124-3D6C-CF1A-94A107AEF380 received CONNACK
> (0) 
> Client auto-18E5C5B9-9124-3D6C-CF1A-94A107AEF380 sending SUBSCRIBE
> (Mid: 1, Topic: #, QoS: 0, Options: 0x00) 
> Client auto-18E5C5B9-9124-3D6C-CF1A-94A107AEF380 received SUBACK 
> Subscribed (mid: 1): 0 
> Client auto-18E5C5B9-9124-3D6C-CF1A-94A107AEF380 received PUBLISH
> (d0, q0, r0, m0, 'R/asdf/adsf/asdf/asdf/', ... (11 bytes)) 
> R/asdf/adsf/asdf/asdf/ message one 
> Client auto-18E5C5B9-9124-3D6C-CF1A-94A107AEF380 received PUBLISH
> (d0, q0, r0, m0, 'R/asdf/adsf/asdf/asdf/', ... (11 bytes)) 
> R/asdf/adsf/asdf/asdf/ message two 
> 
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