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I wonder why they don't use HTTP2 Server Push instead of Web Sockets. And I wonder why they don't want to use MQTT.

Can you think of any good reasons?

HTTP2 server push isn't really designed for the kind of two way communication needed in IoT use cases, it's mainly designed for web servers pushing CSS files down to a web browser before they're requested.

MQTT isn't a web protocol and the goal here is to give things URLs on the web. But I'm aware of some Web of Things implementations using MQTT over WebSockets to benefit from the QoS features.

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