[prev in list] [next in list] [prev in thread] [next in thread] 

List:       activemq-dev
Subject:    Re: MQTT Durable Messages and Topic
From:       Christopher Shannon <christopher.l.shannon () gmail ! com>
Date:       2017-02-21 15:53:49
Message-ID: CACHnxzy+ap3zdfBjQDN2w4wRr1G0ZTNWeG2F9=P3+Z_8J2Gj7w () mail ! gmail ! com
[Download RAW message or body]


If you set your QoS=0 then it should be a normal topic sub and not a
durable.  The documentation is on http://activemq.apache.org/mqtt.html

"ActiveMQ is a JMS broker in its core, so there needs to be some mapping
between MQTT subscriptions and JMS semantics. Subscriptions with QoS=0 (At
Most Once) are directly mapped to plain JMS non-persistent topics. For
reliable messaging, QoS=1 and QoS=2, by default subscriptions are
transformed to JMS durable topic subscribers. This behaviour is desired in
most scenarios. "


On Mon, Feb 20, 2017 at 9:46 AM, fabio72 <fabio.banfi@beta80group.it> wrote:

> Hi,
> we have noticed that all mqtt messages and topics are durable and this
> cause
> an higher usage of memory (and also a slower performance index).
> Is it possible to choose whether to use durable messages (like jms
> messages)
> or not?
> In our case we need durable messages only for retained messages
>
> tks
>
>
>
> --
> View this message in context: http://activemq.2283324.n4.
> nabble.com/MQTT-Durable-Messages-and-Topic-tp4722238.html
> Sent from the ActiveMQ - Dev mailing list archive at Nabble.com.
>


[prev in list] [next in list] [prev in thread] [next in thread]