**Scenario**

I want to control my remote controllable skylights with my Raspberry Pi. The windows were installed a few years back and come already with the remote capable [io-homecontrol](http://www.io-homecontrol.com/index.php/en/) technology, which comes with remotes that can each control one window. Going forward into 2017 I want to interface those devices with a more central system. My goal is to control it via Raspberry Pi. 

Unfortunately io-homecontrol is a multi-vendor system that's poorly documented for outsiders. I've found an [old blog that details how to make it work by physically connecting the GPIO of the Raspberry Pi to the dissected remote of the skylight](https://egrasland.blogspot.de/2014/01/control-your-velux-roller-shutter-with.html). I would very much prefer to forgo so many relays and cracked open remotes.

**Question**

How do I control io-homecontrol devices via Raspberry Pi without physically attaching the PCB of the remote to it?