xalock

#!/bin/bash

BTHW="A0:9E:1A:14:FE:10"	# Enter your Phone Bluetooth hardware address
TIMEOUT=30000

function expired() {
    inactivetime=$(xprintidle)
    echo $inactivetime
    if [ "$inactivetime" -lt "$TIMEOUT" ]; then
        return 1
    fi
    return 0
}


while true
do	# Run only if screen is locked
    if ! expired; then
        sleep $((($TIMEOUT - $inactivetime + 1000) / 1000))
        continue
    fi
    if ! bluetoothctl info $BTHW | grep "Connected: yes" >/dev/null 2>/dev/null; then
        if bluetoothctl connect $BTHW ; then
            continue
        fi
        notify-send "Locking in 5"
        sleep 5
        if expired; then
            xlock &
            wait
        fi
    fi
    sleep 5
done