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https://issues.apache.org/jira/browse/QPIDJMS-425?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16681233#comment-16681233
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Robbie Gemmell commented on QPIDJMS-425:
----------------------------------------

Yes, ServiceBus seems to have its own specific higher-level interpretations of 
'idle', beyond the connection itself and its heartbeats.

> First heartbeat can be sent at greater interval than subsequent ones
> --------------------------------------------------------------------
>
>                 Key: QPIDJMS-425
>                 URL: https://issues.apache.org/jira/browse/QPIDJMS-425
>             Project: Qpid JMS
>          Issue Type: Bug
>          Components: qpid-jms-client
>    Affects Versions: 0.37.0
>            Reporter: David De Franco
>            Priority: Minor
>         Attachments: heartbeat-120000.log, heartbeat-150000.log, 
> heartbeat-300000.log, heartbeat-40000.log, heartbeat-60000.log
>
>
> We use Qpid JMS for commucation with the Azure Service Bus.
> In the Open frame from Azure the idleTimeout field has value 240000.
> Based on this we expect heartbeat frames are send by Qpid JMS every 2 minutes.
> This is correct for the second heartbeat frame and the following frames. But 
> not for the first heartbeat frame. Which is sent later than after 2 minutes. 
> And it depends on the client idle timeout setting. The time after which the 
> first heartbeat frame is sent is for the following client idle timeout 
> settings:
> 40000 -> 2 minutes 40 seconds
> 60000 -> 3 minutes
> 120000 -> 4 minutes
> 150000 -> 4 minutes
> 300000 -> 4 minutes
> Also see the attached log files.



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