Nut Server Service File for Raspberry Pi OS or Raspbian

nut-server.service

# Install as /etc/systemd/system/nut-server.service
#
[Unit]
Description=Network UPS Tools - power devices information server
After=local-fs.target network.target nut-driver.service
# We don't Require drivers to be successfully started! This would be
# a change of behavior compared to init SysV, and could prevent from
# accessing successfully started, at least to audit a system.
Wants=nut-driver.service
Before=nut-monitor.service

[Service]
ExecStartPre=/bin/sleep 10
ExecStart=/sbin/upsd
Type=forking

[Install]
WantedBy=multi-user.target