Sommer garage controller with Home Assistant, Raspberry and MCP23017

New challenge. Some time ago I got installed a new garage gate, managed by a Sommer controller. The board has open pins for an additional opener, like an external button. So, other than the provided remote I had the chance to buy a second one or a wired/wireless pinpad for something around 80€.
But why doing something so easy and (…) cheap rather than spend a lot more money (well, maybe not this) and time to build an interface myself using a Raspberry?
So I started digging the hole of Home Assistant!

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