Thermostart is an application that you can run to control your useless cloud-connected Thermosmart device.
Add the repository and then the addon by clicking on the badges:
If something goes wrong, you can install it manually.
You can add the URL of this page in your "add-on store" as a new repository:
Settings > Add-ons > ADD-ON STORE button in bottom right corner > three dots in top right corner > Repositories
Click Check for updates and you will find the add-on "Simple Scheduler" listed.