mqtt-users team mailing list archive

[Roger Light <roger@xxxxxxxxxx>]

Hi Jesús,

Message queuing for disconnected clients requires a few conditions to
be met. You should check these:

* the client must be a persistent client (have clean session set to false)
* the client must have a subscription with QoS>0.
* incoming messages to be queued must have QoS>0.

If any of those aren't met, the messages won't be queued. The one I
normally forget is subscribing to QoS>0.

Mosquitto 0.16 will allow queuing of messages with QoS=0, but this is
a feature beyond the protocol spec so it probably shouldn't be relied
upon.

Hope this helps,

Roger

On Tue, Jun 5, 2012 at 11:08 AM, Jesús Iglesias <osus@xxxxxxxxxxx> wrote:
> Hi all,
>
> I have a system with publishers subscribers and everything works fine except
> when a suscriber is not available.
> It's supossed to Mosquitto being queueing all messages to that user and
> sending all of them when the user is available, but instead it's only
> sending the last message and the previous are being discarded.
>
> Am i doing something wrong?
>
>
> Regards,
> Jesus
>
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