Has anyone configured nut?
# cat /etc/nut/ups.conf
# Config file automatically generated from UCI config
# uci show | grep nut
nut_server.upsname=pi_ups
nut_server.driver=usbhid-ups
nut_server.port=auto
daemon.err upsd[2778]: Fatal error: at least one UPS must be defined in ups.conf
daemon.info procd: Instance nut-server::upsd s in a crash loop 6 crashes, 0 seconds since last crash