He’s wrong about the Hermetry half. Hermetry can send commands and shared attribute changes to devices behind a gateway: the gateway gets them on v1/gw/rpc or v1/gw/attributes and has to apply them, so it depends on whether the contractor’s gateway software handles those topics. A command to the gateway device itself works too, so the box in your electrical room can get “start validation sampling” from a dashboard button or a rule and fan it out locally. That’s one command instead of 30. The radio half is Eric’s territory.
Measure twice, poll once.