I have been reading the documentation of this new SaaS offering, but I do not see any mention about being able to send a message to the device, eg: to switch ON/OFF an e
For your specific use case, the only way to do this today is to trigger a Logic App workflow using its HTTP endpoint from the Azure Functions. In the Logic app, you can build a workflow using the Azure IoT Central connector that updates device properties and settings.
We are working on APIs in IoT Central that can light up use cases like yours, so stay tuned!