hcitool scan

#!/bin/bash

DEVICE=MAC-адрес Bluetooth-устройства
DEV_NAME="Имя устройства"
INTERVAL=5 # in seconds

# The xscreensaver PID
XSS_PID=

# Start xscreensaver if it's not already running
pgrep xscreensaver
if [ $? -eq 1 ]; then
echo "Starting xscreensaver..."
xscreensaver &
fi

# Assumes you've already paired and trusted the device
while [ 1 ]; do
opt=`hcitool name $DEVICE`
if [ "$opt" = "$DEV_NAME" ]; then
echo "Device '$opt' found"
if [ -n "$XSS_PID" ]; then
echo "Killing $XSS_PID"
kill $XSS_PID
XSS_PID=
fi
else
echo "Can't find device $DEVICE ($DEV_NAME); locking!"
xscreensaver-command -lock
XSS_PID=$!
fi
sleep $INTERVAL
done