Use KDE Connect for sharing files or text to a device, ringing it, unlocking it, and much more. More information: https://kdeconnect.kde.org.
kdeconnect-cli --list-devices
kdeconnect-cli --list-available
kdeconnect-cli --pair --device device_id
kdeconnect-cli --ring --name "device_name"
kdeconnect-cli --share url|path/to/file --device device_id
kdeconnect-cli --name "device_name" --send-sms "message" --destination phone_number --attachment path/to/file
kdeconnect-cli --name "device_name" --unlock
kdeconnect-cli --name "device_name" --send-keys key