Deleting retained messages under a topic recursively

[ahmet....@esensi.com.tr]

When deleting the retained message (for example from topic "tmp/a"), HiveMQ won't delete retained messages that have subscribed to topics under it ( say "tmp/a/b" and "tmp/a/b/c"). This means I know and delete each such retained message one by one.

Are there plans to extend the specs to include such a behavior? Are there brokers that support such an operation?

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[Dominik Obermaier]

Hi Ahmet,

if you want to remove retained messages with a null message, then you always have - according to the spec - to delete them one by one. This behaviour is implemented in any MQTT broker I know of (which supports retained messages). There are no plans to extend the spec to support such a behaviour. At least I don't know of such plans.

In case of HiveMQ, you can write a plugin [1] which implements the behaviour you want easily with a onPublishCallback. There is a management/operations application in development for HiveMQ which eases these operations. I invite you to contact me directly if you are interested in that.


Dominik


[1] http://www.hivemq.com/docs/plugins/1.4.0/
[2] http://www.hivemq.com/docs/plugins/1.4.0/#onPublish-callback

ahmet....@esensi.com.tr wrote:

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[Dominik Obermaier]

Hi Ahmet,

there is now a HiveMQ plugin available which adds your desired behaviour to HiveMQ. Every retained message on a subtopic will be deleted as well if a retained message is removed on a topic. You can download the plugin here: http://www.hivemq.com/plugin/delete-retained-messages-recursively-plugin/

Best,

Dominik

[Ahmet Cepoğlu]

Hey Dominik,

I have taken the liberty to write one myself :) It's good that others have felt the same need to develop one, as I don't have the rights over mine to share it; I can't even remove the confidentiality notice signature from my emails...

Thanks for your response though.

Bye

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[Roger Light]

I must have missed this topic the first time round. There is a utility
in the Paho Python repository that can clear retained topic patterns:
http://git.eclipse.org/c/paho/org.eclipse.paho.mqtt.python.git/tree/examples/mqtt_clear_retain.py

Cheers,

Roger