Assuming you have a Homematic IP CCU3 or similar running with CCU-Jack installed.
Copy config.py.example to config.py and secrets.py.example to secrets.py and adapt them to your needs.
Choose a fitting font file. RobotoBold 14pt works well. You can create the needed bdf file with the otf2bdf tool:
otf2bdf Roboto-Bold.ttf -p 14 -o RobotoBold14.bdf