apt install nut

vi /etc/nut/nut.conf
MODE=netclient

vi /etc/nut/ups.conf
maxretry = 3

vi /etc/nut/upsd.conf
LISTEN 192.168.1.100 3493

vi /etc/nut/upsd.users 
[slave]
  password = **mot de passe**
  allowfrom = slaves
  upsmon slave

vi /etc/nut/upsmon.conf
MONITOR mge@192.168.1.100 1 slave **mot de passe** slaves
SHUTDOWNCMD "/sbin/shutdown -h now"
HOSTSYNC 15
#POWERDOWNFLAG /etc/nut/killpower
FINALDELAY 5
NOTIFYCMD /sbin/upssched
NOTIFYMSG ONBATT "%s is on battery"
NOTIFYMSG ONLINE "%s is back online"
NOTIFYMSG LOWBATT "%s has a low battery!"
NOTIFYMSG SHUTDOWN "System is being shutdown!"

NOTIFYFLAG ONLINE SYSLOG+EXEC
NOTIFYFLAG ONBATT SYSLOG+EXEC
NOTIFYFLAG LOWBATT SYSLOG+EXEC
NOTIFYFLAG FSD SYSLOG+WALL+EXEC
NOTIFYFLAG COMMOK SYSLOG+EXEC
NOTIFYFLAG COMMBAD SYSLOG+EXEC
NOTIFYFLAG SHUTDOWN SYSLOG+EXEC
NOTIFYFLAG REPLBATT SYSLOG+EXEC
NOTIFYFLAG NOCOMM SYSLOG+EXEC

vi /etc/nut/upssched.conf
# les scripts
CMDSCRIPT /bin/upssched-cmd

# les mandats
LOCKFN /var/lib/nut/upssched.lock
PIPEFN /var/lib/nut/upssched.pipe

# shutdown propre apres 5mn en ONBATT
AT ONBATT * START-TIMER shutdown 300

# annulation des actions si EDF OK
AT ONLINE * CANCEL-TIMER onbatt
AT ONLINE * CANCEL-TIMER shutdown

vi /bin/upssched-cmd
#! /bin/sh
#
# This script should be called by upssched via the CMDSCRIPT directive.
#
# Here is a quick example to show how to handle a bunch of possible
# timer names with the help of the case structure.
#
# This script may be replaced with another program without harm.
#
# The first argument passed to your CMDSCRIPT is the name of the timer
# from your AT lines.


case $1 in
    upsgone)
            logger -t upssched-cmd "The UPS has been gone for a while"
            ;;
    batths)
            logger -t upssched-cmd "La Batterie de l'onduleur est HS"
            echo "Batt Onduleur" | mail -s "La Batterie de l'onduleur est HS" damien.cellier@icloud.com
            ;;
    commbad)
            logger -t upssched-cmd "Envoi Avertissement via mail"
            echo "Communication Onduleur KO" | mail -s "la communication avec l'onduleur est KO" damien.cellier@icloud.com
            ;;
    commok)
            logger -t upssched-cmd "Envoi Avertissement via mail"
            echo "Communication Onduleur OK" | mail -s "la communication avec l'onduleur est OK" damien.cellier@icloud.com
            ;;
    onbatt)
            logger -t upssched-cmd "Envoi Avertissement via mail"
            echo "Coupure EDF" | mail -s "ONDULEUR Proxmox HS" damien.cellier@icloud.com
            ;;
    online)
            logger -t upssched-cmd "Envoi retour a la normal via mail"
            echo "EDF OK" | mail -s "ONDULEUR Proxmox OK" damien.cellier@icloud.com
            ;;
    shutdown)
            logger -t upssched-cmd "Shutting down using: upsmon -c fsd"
            upsmon -c fsd
            ;;
    shutdown1)
            logger -t upssched-cmd "Shutting down using: upsmon -c fsd"
            umount /mnt/pve/data
            ;;
    shutdown2)
            logger -t upssched-cmd "Shutting down using: upsmon -c fsd"
            umount /mnt/pve/data2
            ;;
    stopusb)
            logger -t upssched-cmd "Arret du port usb"
            upsdrvctl stop
            ;;
    startusb)
            logger -t upssched-cmd "Relance du port usb"
            upsdrvctl start
            ;;
    delay)
            logger -t upssched-cmd "Ups.delay.shutdown = 30"
            upsrw -s ups.delay.shutdown=30 -u admin -p xxxmdpxxx mge
            ;;
    *)
            logger -t upssched-cmd "Unrecognized command: $1"
            ;;
esac