mosquitto-users team mailing list archive

[Roger Light <roger@xxxxxxxxxx>]

Hi Daniel,

Durable clients (clean session=false) that make subscriptions and then
disconnect will have messages queued for them if the subscription has
qos>0 or if queue_qos0_messages is true. If
persistent_client_expiration has a value, once the duration has been
met then the client, its subscriptions and queued messages will be
deleted.

This does not affect topics with retained messages set, they are a
different thing altogether. This is what Andy is referring to - you
can clear a retained message by sending a new retained message with
zero length payload:

mosquitto_pub -n -r -t foo/bar

I'm not entirely sure what you mean by a topic being removed, unless
you are referring to retained messages.

Cheers,

Roger

On Tue, Nov 19, 2013 at 8:01 AM, Daniel Arenhage
<daniel.arenhage@xxxxxxxxx> wrote:
> Hello,
>
> Basically my question is, is there a way to determine and remove old topics
> having durable subscribers (clean session set to false)?
>
> The configuration property :
> http://mosquitto.org/man/mosquitto-conf-5.html
> persistent_client_expiration
>
> i interpret to clean up the durable (those with clean session set to false)
> subscriptions to that topic. If no active subscriptions and the
> persistent_client_expiration duration is fulfilled, will the potential
> present messages on this topic be removed and will also this topic be
> removed?
>
> Also, if i connect to a topic having clean_session set to false, will this
> topic be removed after the user drops his connection to it?
>
> Thanks in advance!
>
> Kind regards
>
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