Re: [paho-dev] what happen when I subcribe a topic again?

[Dave Locke <locke@xxxxxxxxxx>]

For a matching subscription on a session
with cleansession set to false the retained message will be re-sent to
the subscriber 

From the subscribe section of the OASIS
3.1.1 MQTT spec:-
If a Server receives a SUBSCRIBE Packet containing
a Topic Filter that is identical to an existing Subscription’s Topic Filter
then it MUST completely replace that existing Subscription with a new Subscription.
The Topic Filter in the new Subscription will be identical to that in the
previous Subscription, although its maximum QoS value could be different.
Any existing retained messages matching the Topic Filter MUST be re-sent,
but the flow of publications MUST NOT be interrupted


All the best 
Dave

 



From:        "Mango" <867380699@xxxxxx>
To:        "paho-dev" <paho-dev@xxxxxxxxxxx>
Date:        10/01/2015 16:14
Subject:        [paho-dev] what happen when I subcribe a topic again?
Sent by:        paho-dev-bounces@xxxxxxxxxxx

---

I set the mqtt option "cleansession" to false.
then what will happen when I sucribe the topic already
sucribed.
will I receive the retained message?
or nothing happen?_______________________________________________
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