How to simplify an IoT system using the MQTT Retained Messages?

What makes the trick is that Retained MQTT message is delivered to all active Subscribers, and also any new Device that Subscribes to the specified MQTT topic in the future.

This feature of an MQTT protocol allows reducing the complexity of #cloud and #edge logic.

In my blog post, I explain how to leverage the MQTT Retained Messages using a SmartHome example.