Crude BlueTooth cellular-theft alarm script

README.textile

See video tutorial

phone-alarm.sh

#!/bin/sh
# Just browse files on phone(s) via bluetooth to create connection,
# then run this script. Will beep if someone steals your phone.

#### Minimum allowed rssi (received signal strength information).
# Move the phone around the house, check the levels on the display,
# and decide what's the best value for your needs.
export MINRSSI="-30"

export CONS="`hcitool con | grep '<' | sed -e 's/^.*ACL //' -e 's/ .*$//' | tr -s [:space:] ' '`"
export NAMES=""
for CON in $CONS; do
    if [ "$NAMES" ]; then
        export NAMES="$NAMES\n"
    fi
    export NAMES="${NAMES}${CON} `hcitool name $CON`"
done
while [ 1 ] ; do
    export STATUS=""
    export ALARM=""
    for CON in $CONS; do
         export RSSI=`hcitool rssi $CON |sed -e 's/^.*: //'`
         if [ -z "$RSSI" ] ; then
             export STATUS="$CON (Off!)s\n$STATUS"
             export ALARM=y
         else
             export STATUS="$CON ($RSSI)\n$STATUS"
             if [ $RSSI -lt $MINRSSI ] ; then
                 export ALARM=y
             fi
         fi
    done
    clear
    echo ======== Watching phone\(s\): ========
    echo $NAMES
    echo "A phone with less rssi than ($MINRSSI) will trigger alarm. edit MINRSSI to change."
    echo ====================================
    echo -n "$STATUS\r"
    if [ "$ALARM" ] ; then
        play -q -n synth 0.2 sin 440 gain -5 bend 0,440,.2 repeat 3
    fi
    sleep 5
done