[Unit]
Description=Pinging the HW watchdog
Requires=multi-user.target
After=multi-user.target

[Service]
Type=oneshot
RemainAfterExit=yes
ExecStartPre=/bin/sh -c '[ "$(/bin/systemctl list-units --failed --all --no-legend --no-pager)" == "" ]'
ExecStart=/bin/busctl set-property org.freedesktop.systemd1 /org/freedesktop/systemd1 org.freedesktop.systemd1.Manager RuntimeWatchdogUSec t 30000000

[Install]
WantedBy=multi-user.target