Home Assistant is a great way to do it. It has its own automation framework but I’m sure you can easily hook in your own scripts, or write them as your own plug

Home Assistant is a great way to do it. It has its own automation framework but I’m sure you can easily hook in your own scripts, or write them as your own plugins for HA. You can send push notifications to the mobile apps, it even supports actions on notifications I believe, and then you can obviously send events back to the server with it as well.