This Arduino project uses the UART2 interface of a ESP32 to retreive data via M-Bus from a smart meter and transmits it via MQTT. It is tested with a CF UltraMaxx MK.

• ESP32 development board
• IR Lesekopf for the optical interface

Not scope of this project is decoding the mbus data. You can learn about the data structure at:

• M-Bus Telegramme
• Wärmezähler über optische M-Bus-Schnittstelle auslesen
• M-Bus Protokoll Ultramess C3