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NATS doesn't support MQTTv5 so for serious MQTT usage it is still useless unfortunately.

We are waiting on demand for it. We have a bunch of folks using MQTT on NATS and NGS but no requests yet for MQTTv5 so far.

Once we see legit demand we will make sure it's supported.

I think its a vicious cycle - No one supports it so services don't implement it, and because no services implement it people use hacky ways to do what MQTTv5 does out of the box or use services they normally wouldn't because the ones they want only support MQTT 3.1.1.

We use NATS for pretty much all of our MQ / Service Bus type stuff, we were using GCP Iot, AWS IoT and recently moved to EMQX as it has native MQTTv5 support.

NATS would have been a much better choice for us but the support wasn't there.

Build it and they will come :)

Would your company be willing to fund the development? Or would you be willing to post a PR? We would be happy to take a look.

Funding possibly - PR not likely as we dont work in Go. Will socialise and come back to you

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