If you are using Strato Pi’s serial ports for your applications, you also need to disable the
Linux serial console, otherwise it will send console data to the serial port.
Disable the ttyAMA0 console service:
sudo systemctl disable serial-getty@ttyAMA0.service
Edit the /boot/cmdline.txt file and delete the serial console configuration:
console=serial0,115200
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Strato Pi Base User Guide