can.logger script doesn't work when started from systemd

Hi,

I use a systemd service to log the socketcan can0 with can.logger script.
I use a Unit file that call the script:

...
[Service]
Type=simple
ExecStart=python -m can.logger -f /home/admin/can-logs/test.blf -v -c can0 -i socketcan
...

This script works perfectly when called from the linux shell, but when I start it from the service, the log file is created in /home/admin/can-logs but stay empty.
What could be wrong ? is python-can not able to handle socketcan from systemd service ?

Thanks for your help,