Don’t hesitate to make a feature proposal, it’s the biggest job to be done, so that development can happen quickly afterwards.
A bit like thinking about the plans for your house before construction, when you know where you’re going, it all happens by itself.
I had made a first sketch that I need to update with my experience of my current connected devices, don’t hesitate to make a new one or to complete it:
Another example of functional specification (by @pierre-gilles):