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Message persistence in kapua - Subscriber connection lost [message #1772070]

Tue, 05 September 2017 08:55

Raghu Akella

Messages: 4
Registered: September 2017

Junior Member

Hi,

I am using Kapua for my IOT solution. I have created two node applications one works a s a subscriber and one works as a client and both applications are pointing to locally running broker. Here my question is , If subscriber lost connection but publisher continuously sending messages on a topic. and after some time subscriber got active connection to broker.

In the above scenario once the subscriber is up will it receive all the messages (current messages + messages which were sent when the subscriber was down) or only current messages.

I have read ActiveMQ documentation which says durable subscriber. Is kapua internally using the same or do we need to do any additional changes.

Please help me.

Thanks,
Raghu

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Re: Message persistence in kapua - Subscriber connection lost [message #1778476 is a reply to message #1772070]

Thu, 14 December 2017 16:35

Riccardo Modanese

Messages: 5
Registered: August 2017

Junior Member

Hi Raghu,
the current Kapua configuration uses the VirtualTopic as default in the MQTT connectors and the broker persistence is set.
So, with that condition, if you subscribe a topic with QoS>0 the broker subscribes the client to a virtual queue.
In other word, every subscriber with QoS>0 is a durable subscriber.

Riccardo

[Updated on: Thu, 14 December 2017 16:36]

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