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I still wonder if MQTT really has the right tradeoffs compared to AMQP, especially as you try to scale things beyond hello world.

Is anyone using AMQP in a public API?

Zebra Technologies' Zatar[1] platform use AMQP for the communication between the devices and the server.

I don't know if this is what you meant with "public API".

zatar.com talks of CoAP but I don't see AMQP mentioned.