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Does it use AMQP?

No, according to [1] it uses JMS or TCP (correction: JMS over TCP?).

JMS is an API (over-simplification, but at it's core it's an API). It doesn't specify a wire protocol

I don't see MQTT support either.

There is a mention of MQTT support in roadmap section as planned feature.

Yes, it's our roadmap, and we will support MQTT soon.