Lets use it. the setup is just a raspberrypi or any linux box with a bluetooth usb adapter plugged in

<linux terminal>

$ sudo apt-get update

$ sudo apt-get install bluetooth bluez-utils blueman

$ easy_install PyBluez <this is the python library you are going to need>

$hcitool scan

<end linux terminal>

the hcitool scan will return a mac address then you can use or pass the mac address in python and find out if the device is in the area.

<python stuff starts here>

import bluetooth

result = bluetooth.lookup_name('11:22:33:44:55:66', timeout=5)

if (result != None):

output = "locator=mike location=1"

else:

output = "locator=mike location=0"

print output

<end python stuff >

this will print out the locator and 0 or 1 depending on whether or not the device was found.

!!! the end user doesn't need to have discovery enable after you found out what the mac address is.