MQTT Subscribe does not receive messages after few hours

0
votes

I am using Paho MQTT (java) to subscribe (QoS 2) to VerneMQ broker. I have a device which constantly (every 2 seconds) publishes data to broker. Everything works fine until after 3 - 4 hours, my MQTT Subscriber program does not receive anything, but it is still connected and is running (I will name this condition as sleep).

However, when there is another MQTT Subscriber subscribing to the same topic, the sleeping MQTT Subscriber program start to receives message again. If I have at least 2 subscribers subscribing on every topics I have, it works fine. Any solutions on this situation?

1
javanetworkingmqttpaho
Have you tried a different broker? - hardillb
Nope, not yet. I am currently finding for broker which supports clustering and budget friendly(well VernMQ is open source). VernMQ comes to my first choice previously. - Deric Dominic
But to test with a single client doesn't need any of those features - hardillb
Ok. I will give it a try with rabbitmq. Hope it solves the problem next 3-4 hours. - Deric Dominic
I seems fine for me when i am using RabbitMQ as my broker. So I supposed VerneMQ is faulty? - Deric Dominic

1 Answers

1
votes

Are you using VerneMQ 0.12.4? There was a known issue regarding UNSUBSCRIBE in previous versions.

If you're using 0.12.4 please get in touch with us!

Cheers,

Andre from VerneMQ

PS: I'll update the answer as soon as we've more insights about the issue