Re: [mosquitto-dev] mosquitto.conf - subscribed topics using MQTT protoc

[Peter Silva <peter@xxxxxxxxxxxxxxx>]

This bit me also...  MessageExpiryInterval is your friend... default is 0 ... ie. drop all messages when connection is lost.

relevant bits from my python app:

              props=Properties(PacketTypes.CONNECT)
                if self.o['message_ttl'] > 0:
                    props.MessageExpiryInterval=int(self.o['message_ttl'])

  res = self.client.connect( options['broker'].hostname, port=self.__sslClientSetup(), properties=props  )

On Tue, Apr 20, 2021 at 12:41 PM Ben Hardill <hardillb@xxxxxxxxx> wrote:

Hi,

How have you configured mosquitto? Have you enabled persistence?

If not how is the broker supposed to retain the clients session when you
resart?

On 20/04/2021 17:37, Bindu Rao wrote:
> Hi,
>
> I am using mosquitto broker with paho_mqtt client. I notice a problem in
> the following scenario:
> Usecase:
> - MQTT Protocol set to 5
> - Clean start = false and session expiry interval set to 30 secs
>
> I configure the client for publication and subscription on a topic.
> Terminate and restart mosquitto.
>
> Expected behaviour:
> - Should be able to receive messages on a subscribed topics after
> reconnection.
> Actual behaviour:
> - Session not remembered, hence need to be resubscribed even when clean
> the start is set to false by the client.
> I am using mosquitto - 2.0.10. The behaviour is perfectly ok when used
> with protocol 3.1.1.
> What configuration variables should be set in mosquitto.conf to get this
> working? Could you please provide inputs?
> Please note, that this works fine when I use other mqtt brokers.
>
> Thanks,
> Bindu
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