Dengan memanfaatkan device bluetooth yang ada pada komputer dan handphone kita dapat membuat komputer seolah olah mengetahui kita sedang berada dekat pada komputer atau sedang jauh. jika kita sedang jauh ( dengan memanfaatkan kekuatan sinyal bluetooth ) maka komputer akan secara otomatis lock komputer kita.
Ternyata hal ini tidaklah sulit, hanya dengan menggunakan hcitool kita sudah bisa melakukannya. script ini saya ambil dari http://www.novell.com/coolsolutions/feature/18684.html dengan beberapa perubahan untuk disesuaikan dengan komputer dan handphone yang saya pakai.
#!/bin/bash
#set -o verbose sh -v
# Copied from Steven on http://gentoo-wiki.com/Talk:TIP_Bluetooth_Proximity_Monitor
# These are the sections you’ll need to edit
# You’ll need to use the MAC address of your phone here
#DEVICE=”00:0F:46:FF:05:07″
DEVICE=”00:21:9E:22:EB:6E”
# How often to check the distance between phone and computer in seconds
CHECK_INTERVAL=2
# The RSSI threshold at which a phone is considered far or near
THRESHOLD=-3
# The command to run when your phone gets too far away
FAR_CMD=’gnome-screensaver-command –activate -l’
# The command to run when your phone is close again
NEAR_CMD=’gnome-screensaver-command –poke’
HCITOOL=”/usr/bin/hcitool”
STARTX_PID=0
DEBUG=”/tmp/btproximity.log”
connected=0
function msg {
echo “$1″ #>> “$DEBUG”
}
function check_connection {
connected=0;
found=0
for s in `$HCITOOL con`; do
if [[ "$s" == "$DEVICE" ]]; then
found=1;
fi
done
if [[ $found == 1 ]]; then
connected=1;
else
msg ‘Attempting connection…’
if [ -z "`$HCITOOL cc $DEVICE 2>&1`" ]; then
msg ‘Connected.’
connected=1;
else
if [ -z "`l2ping -c 2 $DEVICE 2>&1`" ]; then
if [ -z "`$HCITOOL cc $DEVICE 2>&1`" ]; then
msg ‘Connected.’
connected=1;
else
msg “ERROR: Could not connect to device $DEVICE.”
connected=0;
fi
fi
fi
fi
}
check_connection
while [[ $connected -eq 0 ]]; do
check_connection
sleep 3
done
name=`$HCITOOL name $DEVICE`
msg “Monitoring proximity of \”$name\” [$DEVICE]“;
state=”near”
while /bin/true; do
check_connection
if [[ $connected -eq 1 ]]; then
rssi=$($HCITOOL rssi $DEVICE | sed -e ‘s/RSSI return value: //g’)
if [[ $rssi -le $THRESHOLD ]]; then
if [[ "$state" == "near" ]]; then
msg “*** Device \”$name\” [$DEVICE] has left proximity”
state=”far”
$FAR_CMD > /dev/null 2>&1
fi
else
if [[ "$state" == "far" && $rssi -ge $[$THRESHOLD+2] ]]; then
msg “*** Device \”$name\” [$DEVICE] is within proximity”
state=”near”
$NEAR_CMD > /dev/null 2>&1
STARTX_PID=$(pgrep startx)
fi
fi
msg “state = $state, RSSI = $rssi”
fi
sleep $CHECK_INTERVAL
done
untuk mengetahui MAC Address handphone anda cukup jalankan hcitool scan, dan lihat hasilnya. simpan file ini dengan nama proximity.sh lalu berikan permission untuk dieksekusi, lalu jalankan.
