DWS7412.2.G2

During the last month, our engery supplier installed a digital meter for our power usage at home. As he in addition to that offered to unlock the device or to give us the PIN to unlock it ourselves, I were looking for a solution to extract the data from the meter and push it into our Home Assistant installation. I bought the Volkszähler TTL from eBay and wired it onto the serial interface of an ESP8266 laying around on my desk....