pyHeatpump/config/pyheatpump_fetch.service

[Unit]
Description=pyHeatpump fetch - retrieve the data from the serial port with modbus
Requires=serial-getty@ttyUSB0

[Service]
Type=simple
WorkingDirectory=/var/lib/pyheatpump/
Environment="LOGLEVEL=INFO"
ExecStart=/usr/bin/env pyheatpump fetch
KillMode=mixed
TimeoutStopSec=30
PrivateTmp=true