Smart Meter Reader

Core idea: Read measurement data from a smart meter and publish it on a sink (at the moment only Homie 4.0.0 is suppoted).

The clients and sinks are running as asyncio.Task with their own infinite loop and put/get the data on a central asyncio.queue with a very simple dict data exchange model.

Configuration

Configuration management is done with dynaconf with environments enabled (see here). It is recommended to give every configured meter a dedicated environment name. In my case:

• dummy: Dummy client and sink
• t210: Sagemcom T210-D-r electric smart meter with according homie sink
• kamstrup_403: Kamstrup 403 heat smart meter with according homie sink

Feel free to add own configurations with own namings.

It is expected to find in the working directory where the package is executed:

• config.py
• settings.toml
• OPTIONAL: .secrets.toml

Remark: all secret variables

Running standalone

If you want to run this packages as standalone executable (using the dummy client and homie sink):

export ENV_FOR_DYNACONF="dummy"
poetry python3 -m smart_meter_reader

It does not support command line arguments as it is expected to be configured using dynaconf.

Service

In the folder etc a systemd unit template file is provided. The argument identifier in the service instance is used as an identifier for the configuration environment.

• smart_meter_reader@t210.service
• smart_meter_reader@kamstrup_403.service

Hardware

I decided to run the smart-meter-reader on a Raspberry Pi. The reason is that additional services (in my case homegear is running to connect homematic devices to openhab) are running on this compute unit.

All communication to the clients is realized via serial communication.

Clients

Sagemcom T210-D-r

I am connecting to a Sagemcom T210-D-r as provided by Energie Steiermark (Austria) via the P1 interface (specifiction 5.0.2 - list of further documents for DSMR).

For interpretation of the encrypted payload this repo was the important key to success - thanks to schopenhauer!

Interface hardware: There are multiple options to interface with the P1 interface (Open collector serial output - see specifiction 5.0.2). I decided to build a small prototype hat for the Raspberry Pi following this [cuircuit design][tasmote_p1_interface]

Kamstrup Multical 403

I was not able to find any official documentation from Kamstrup on the protocoll which is ued on the IR interface. Thanks to golles/ha-kamstrup_403 and bsdphk/PyKamstrup I was able to set up the communication

Interface hardware: There are multiple options for infrared read/write heads

• I am using the one from Volkszaehler.org.

Credits and Acknowledgements

The whole code is built on top of some great prior work. I mention here explicitly the less "default" but for this purpose directly relevant implementations (ordering does not reflect importance ;-) ):

• schopenhauer/sage: I would have miserably failed on interpreting the encrypted data message from the Sagecom T210-D-r without this work and the great explainations
• ndokter/dsmr_parser: This library is used the PyPi hosted package to parse the DSMR telegrams to python objects
• golles/ha-kamstrup_403: I used directly the source code (because I didn't wanted to introduce dependencies to homegear) -> But a big thanks to golles for his work!
• bsdphk/PyKamstrup: I guess this is the origin of the very famous "kamstrup.py" file a lot of people are depending on. Thanks bsdphk for your work!
• mjcumming/Homie4: Implementation of the Homie 4.0.0 standard which I used to generate the data sink