Re: [mosquitto-dev] A Few Questions about mosquitto.conf File

[Karl Palsson <karlp@xxxxxxxxxxxx>]

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Devil Here <heredevil008@xxxxxxxxx> wrote:
> Hi Karl,
> Thanks for your prompt and early reply , I read the man page about
> config file again and I also agree that there are some points where the
> man page does not properly explains a few fields. 
> Regarding my queries, I checked for 1 and 5 again and I agree with your
> reasons (my mistake on part of reading the man page properly) but what
> would be behavior of broker if i set the "max_inflight_messages" to 25,
> and by some circumstances there is a 26th message for a client which
> comes in the queue of broker for a topic??.

Again, you're NOT sending messages to a client.  You're sending them to
a topic. Which _may_ have a subscriber.  


> However, for point 2 my question was a little bit ambiguous and i got
> the answer with help of Q1 itself.
> By point 3, I meant that lets suppose I am publishing to a topic
> "test/dev" and there is only 2 clients subscribed to this topic (one is the publisher and the other one is only the 
> subscriber of the topic). 

Note the publisher doesn't have to be subscribed at all.

> After some days/some period of time the subscriber disconnects from the topic 
> "test/dev", and the publisher is still publishing to the topic. Now If I want to delete this topic and all the 
> messages published on this topic from the broker queue, then is it possible to do that by some means??

_IF_ the client was persistent, and _IF_ it had subscribed at a higher qos level (1 or 2) then there would be messages queued for that _client_.   Those can be aged out by the persistent client expiration setting, but there's no explicit knob in mosquitto to do this.  You can however reconnect with the same client id and subscribe/unsubscribe with clean session = true, which will also drop any data for the persistent client that no longer exists.

There is no topic to delete.

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