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MQSeries.net Forum Index » IBM MQ Telemetry / Low Latency Messaging / Everyplace » MQTT v3.1.1 on MQ 8.0.0.8

MQTT v3.1.1 on MQ 8.0.0.8

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souciance

Posted: Tue Jan 23, 2018 10:58 am Post subject: MQTT v3.1.1 on MQ 8.0.0.8

Disciple

Joined: 29 Jun 2010
Posts: 154

Hello,

According to the docs the latest fixpack should support MQTT 3.1.1. However when connect via a java client using Paho we simply get:

Code:

Exception in thread "main" Connection lost (32109) - java.io.EOFException
at org.eclipse.paho.client.mqttv3.internal.CommsReceiver.run(CommsReceiver.java:181)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:483)
at java.util.concurrent.FutureTask.run(FutureTask.java:274)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:190)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:304)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1157)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:627)
at java.lang.Thread.run(Thread.java:809)
Caused by: java.io.EOFException
at java.io.DataInputStream.readByte(DataInputStream.java:279)
at org.eclipse.paho.client.mqttv3.internal.wire.MqttInputStream.readMqttWireMessage(MqttInputStream.java:92)
at org.eclipse.paho.client.mqttv3.internal.CommsReceiver.run(CommsReceiver.java:133)
... 7 more

If we switch to 3.1 then everything works ago. Why doesn't 3.1.1 work? Do we need to enable some parameter on the MQTT broker?

souciance

Posted: Tue Jan 23, 2018 1:09 pm Post subject:

Disciple

Joined: 29 Jun 2010
Posts: 154

I managed to find the root cause. It was pretty ridiculous.

We had created the telemetry channel when we were still on MQ 8.0.0.0. Back then it had only support for 3.1.

After we upgraded to 8.0.0.8 we expected the support for 3.1 to occur automatically.

But no, since the channel was created when it was on 8.0.0.0 you couldn't configure it to support 3.1.1.

The solution was to delete the channel and create a new one.

This was evident by checking the mq logs and view the channel details via runmqsc.

bruce2359

Posted: Tue Jan 23, 2018 7:06 pm Post subject:

Poobah

Joined: 05 Jan 2008
Posts: 8128
Location: US: west coast, almost. Otherwise, enroute.

Moved to telemetry forum.
_________________
I would tell you a UDP joke, but you might not get it.

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