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MQSeries.net Forum IndexWebSphere Message Broker SupportIssue with MQTT implementation in IIB/ACE

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Muhammad Haider
PostPosted: Tue Mar 05, 2019 10:42 pm Post subject: Issue with MQTT implementation in IIB/ACE Reply with quote

Apprentice

Joined: 14 Mar 2011
Posts: 43

Hi, I tried pub/ in IIB and ACE with different QoS levels but still I am not able to get messages published while the subscriber flow was down. Is there a restriction here in toolkit or at the MQTT server level which is being used by IIB /ACE.
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fjb_saper
PostPosted: Wed Mar 06, 2019 3:39 am Post subject: Re: Issue with MQTT implementation in IIB/ACE Reply with quote

Grand Poobah

Joined: 18 Nov 2003
Posts: 19898
Location: LI,NY

Muhammad Haider wrote:
Hi, I tried pub/ in IIB and ACE with different QoS levels but still I am not able to get messages published while the subscriber flow was down. Is there a restriction here in toolkit or at the MQTT server level which is being used by IIB /ACE.

So you have no durable subscription and only a dynamic subscription which is down? Why would you ever expect to see a publication when there is no receiver for it?
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Muhammad Haider
PostPosted: Wed Mar 06, 2019 6:02 am Post subject: Reply with quote

Apprentice

Joined: 14 Mar 2011
Posts: 43

How to make a durable subscription using pub/sub nodes that are available in toolkit and the default MQTT broker running. There is no property for retaining messages on topics on the pub/sub nodes. There is just QoS parameter that we can set and I checked setting it to values 0,1,2 on both pub and sub nodes but no difference. Whenever I stop my subscriber flow to simulate a scenario where a subscriber is offline and he wants to receive the messages when he comes online, i don't get any messages that were already published. I think the feature is missing here in IIB/ACE implementation.
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abhi_thri
PostPosted: Thu Mar 07, 2019 1:30 am Post subject: Reply with quote

Master

Joined: 17 Jul 2017
Posts: 247
Location: UK

hi...have you tried using 'MQPSC_RETAIN_PUB' option while publishing the message?

https://www.ibm.com/support/knowledgecenter/SSMKHH_10.0.0/com.ibm.etools.mft.doc/aq06980_.htm

The last copy of the message should get retained by using this option.
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Muhammad Haider
PostPosted: Sat Mar 23, 2019 7:39 pm Post subject: Reply with quote

Apprentice

Joined: 14 Mar 2011
Posts: 43

Nice idea but is it available for MQTT nodes too apart from MQ? Plus how we can retain more than 1 previous messages ?
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