My UPS NUT client monitoring configuration with push notifications using pushover
Sign up for an account with pushover.net Make a note of your user token. Create an application API token and make a note of it.
Copy both files to /etc/nut. Update upssched-cmd with your user and application tokens where noted. Ensure upssched-cmd is executable. Ensure permissions are correctly set on files (e.g. root:nut).