Smart Meter Readout is a small Python script that periodically reads the values from a KAIFA CL101 Smartmeter from VKW using the MBUS customer interface. It is was tested on a RaspberryPi Zero W with an MBus adapter. The received values are then saved as json files that can be used by a Webserver.
A detailed description of the project and the required hardware can be found on my blog.
The setup uses pypy to execute the script.
The SmartMeter requires a key to accesss.
This key is stored in the file key.txt wich is excluded from the repository.
In order for the systemd service to be able to execute the script the requirements must be installed for all users on the system.
sudo pypy3 -mpip install -r requirements.txt
The Setup as systemd service is done by executing the createService script.
This script expects the required files to be placed in /home/pi/readout
sudo createSercive.sh
Because this script does a lot of periodic writing to files, it is best to store the files in a tmpfs mounted directory.
Therefore, the files are stored in the \ram directory created, for this purpose.