A simple and flat casing for an EMS-Bus interface plus a Wemos D1 Mini board with an ESP8266 microcontroller. You can buy either board (or both) directly from this site. More information about the pcb's can be found here.
Some additional information on how to assemble the casing
To assemble all parts look at the images I provided. You will need 4 screws 2.9x13mm for the top/bottom part and 3 very short screws 2.2x4.5mm to fix the boards to the casing with the provided clamps. I suggest to use a double-sided adhesive for the ESP board clamp (the one that looks like a cross). Please print the plastic clamps for the EMS interface twice, one for the left and one for the right side as you can see in the provided images.
After you assemble the casing you can slide it onto your wall with two 4mm screws. Please be careful here so the screws metal do not touch any electronic parts inside.
You must bend the connectors on both boards so the cable connection between them fits inside the casing. Please use the provided images as a reference.