Ola fellow tweakers! This is an enclosure for the Universal P1 Port Dongle - ESP32-S3 sold by Tinytronics:
[https://www.tinytronics.nl/en/home-automation/sensors/energy/universal-p1-port-dongle-esp32-s3](https://www.tinytronics.nl/en/home-automation/sensors/energy/universal-p1-port-dongle-esp32-s3)

The board is used to read smart meter readings via P1 port (RJ12). Then it can be configured to send the meter reading via WiFi to Home Assistant for further processing. The board is based on ESP32 controller. It has RJ12 input and output ports. Majority of DSMR meters in the Netherlands supply the board with power, however if this is not the case you can also supply it via USB-C.

You can find example configuration on Tinytronics Github page:
[https://github.com/Leotro-Engineering/Universal-P1-Port-Dongle](https://github.com/Leotro-Engineering/Universal-P1-Port-Dongle)

Disclamer:
All rights regarding the creation and distribution of the development board belong to Tinytronics. I created enclosure for it and therefore I only have ownership of my own 3d model. I bought the board with my own funds and this publication is not sponsored by the company. You are allowed to alter and to distribute modifications of this model, if you share link to this original publication.