I figured out my problem -- I had the image and concept of this tutorial (http://www.instructables.com/id/Uber-Home-Automation-w-Arduino-Pi/) one tab over and never noticed at 3am that I mentally blended the articles. Sorry, everyone.

I figured out my problem -- I had the image and concept of this tutorial (http://www.instructables.com/id/Uber-Home-Automation-w-Arduino-Pi/) one tab over and never noticed at 3am that I mentally blended the articles. Sorry, everyone.

@gohan @rozpruwacz After reading a couple times it still wasn't clear that everything could run on one device (single Ras Pi), though that seemed like the intuitive answer. Thank you for confirming as I buy up parts.

I'm trying to understand the need for a separate Gateway if the Ras Pi is the host of the controller. Is it possible to use OpenHab on the Pi AND have the RF transceiver connected to that same Pi and skip the ethernet adapter w/ Arduinos? Or, if you have to use ethernet, could you use localhost as the IP? Or is there a technical reason why that wouldn't work (or would work, but in a totally different way)? Thank you.