For all of the developers out there. I will give a $500 contribution to create an open source app so anyone can use what you create. The keen smart vent and temperature already has a device handler so it’s just creating the interface which allows you to combine 1 temp sensor with an unlimited amount of vents to create a room and then set the temperature of the room based on a schedule (minimum of 2 set points per day preferably 4 over 7 day period just like a nest). This will open and close the vent depending on if you have AC or Heat. The app should support unlimited rooms. The attached pics are the keen software which is very easy to use and laid out but, it keeps going down and having consistency issues and the scheduler is occupied vs unoccupied instead of the temperature which is what it needs.
Bonus. If you can add a feature so that if any room needs air it will lower the main thermostat and if all rooms have air it will raise the thermostat I will add an extra $250 for this feature.