I would check out https://www.home-assistant.io/ for integrating multiple systems together. I use it on a RasPi to integrate a few disparate systems (Amazon, Nest, RadioRa2) and it works very well. There are modules for most existing systems and it's easy to write your own in python.
I probably should try it. I've been writing my own partly as an excuse to learn React. I've already got a Pi with a touchscreen and a 3d printed enclosure setup to run whatever solution I actually end up using.
I know I’m a little late here, but I would look into MQTT as a transport layer for messages across your different devices. It’s super easy to interface with via python or a host of third party services.
