This is a case for an EMS-ESP Gateway (EMS = Energy Management System by Buderus Heaters). I built this gateway by designing my own PCB based on the schematic and software of proddy [1] - thanks a lot and also many thanks to Ingo Fischer who made it possible for me in 2015 to connect to the EMS bus with the ethersex project!

You need:

• this case
• my PCB (see github [2])
• 4 M3x30 screws
• 4 M3 brass inserts 4x8mm
• 4 2,2x8 plastic screws
• 1 Node-MCU V2.0 ("Amica")
• 1 bucket converter [3]
• more electronic parts (see BOM-list on github [2])

[1] https://github.com/proddy/EMS-ESP [2] https://github.com/LineF/EMS-ESP/tree/ems_project [3] https://www.aliexpress.com/item/32826540392.html?spm=a2g0s.9042311.0.0.27424c4dVhBdDI

Two of the bolts are glued at the back of the case. This supports the case against the wall when I push and turn the screws.