bluefence.py

#!/usr/bin/python

# BlueFence version 0.1 (Prototype)
# Author: Yeni Setiawan
# Email	: sandalian@protonmail.ch
# Blog	: https://sandalian.com

import bluetooth
import time
import sys
import os

SCAN_PERIOD = 5                                 # time between searches for device in seconds 
IF_BT_GONE = 'xrandr --output eDP1 --brightness 0' # The command to run when the device is out of range
IF_BT_BACK = 'xrandr --output eDP1 --brightness 1' # The command to run when the device is back in range
MAX_MISSED = 3    
VERBOSE =  True

if len(sys.argv) < 2:
	print("usage bluefence.py <btaddr>")
	sys.exit(1)

btAddr = sys.argv[1]
btInRange = True
screenLocked = False
awayCounter = 0

print("Identifying device...")

try:
	# initial check, see if mentioned BT device active. If it's not, clean exit
	
	btName =  bluetooth.lookup_name(btAddr,timeout=5)

	if btName:
		if VERBOSE:
			print('OK: Found your device',btName)
		
		while True:
			who =  bluetooth.lookup_name(btAddr,timeout=2)

			if who:

				status = 'near'
				btInRange=True
				awayCounter=0
				os.system(IF_BT_BACK)

			else:
				awayCounter+=1
				status = 'away'

			if awayCounter > MAX_MISSED:
				os.system(IF_BT_GONE)
				status = 'MATI!'
				awayCounter = 0
				btInRange=False

			time.sleep(SCAN_PERIOD)

			print(status, '|', awayCounter, '|', btInRange, '|', time.strftime('%H:%M:%S'))
	else:
		print('ER: Your bluetooth device is not active')
		sys.exit
	

# this usually happen when your PC's bluetooth is disabled.
except:
	print('ER: Bluetooth on PC is not active')