[jira] [Commented] (AMQ-5185) Duplicate messages occur for MQTT cleanSession=false client with network of brokers

["Paddy (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/AMQ-5185?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14127819#comment-14127819 ] 

Paddy commented on AMQ-5185:
----------------------------

virtual topic workaround requires consumers to use queues and MQTT clients do not have the concept of queues. Only topics are supported in MQTT.

> Duplicate messages occur  for MQTT cleanSession=false client with network of brokers 
> -------------------------------------------------------------------------------------
>
>                 Key: AMQ-5185
>                 URL: https://issues.apache.org/jira/browse/AMQ-5185
>             Project: ActiveMQ
>          Issue Type: Bug
>          Components: MQTT
>    Affects Versions: 5.9.1
>         Environment: Linux. Python client using MQTT Paho library version 0.9
>            Reporter: Paddy
>              Labels: mqtt
>
> Duplicates delivery of messages occur when connecting to a network of brokers with an MQTT client with cleansession=false.
> Steps to reproduce test:
> 1. Form network of brokers A and B
> 2. Connect "client1" with cleansession=false to broker A and subscribe to topic "paho/test". Make sure client_id is set to "client1".
> 3. Disconnect client1
> 4. Connect "client2" to broker A and publish single message "hello" to topic "paho/test".
> 5. Connect "client1" to broker A and subscribe to "paho/test". Message "hello" would be received.
> 6. Disconnect "client1"
> 7. Connect "client1" to broker B and subscribe to "paho/test". Message "hello" would be received (again).
> Behavior is the same for publishing with qos=0,1,2.



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