Selfie bluetooth controller

selfie.py

import subprocess
import logging
import time
# CHIP IO
import CHIP_IO.GPIO as GPIO
# import evedev module
import evdev


def connect():
    cmd = ['./Blue.sh']
    subprocess.call(cmd)
    time.sleep(5)
    try:
        dev = evdev.InputDevice('/dev/input/event1')
        print("connected..")
        return dev
    except OSError:
        logging.error("No bluetooth device found. Exiting the program")
        raise


if __name__ == "__main__":

    # use constants for better readability
    LOW = 0
    HIGH = 1
    connected = False

    # The logic used here is Active low. That means, when the
    # GPIO is pulled HIGH then LED goes off and when the GPIO
    # is pulled LOW then LED goes on.

    # default state is HIGH
    RED_CURRENT_STATE = HIGH
    GREEN_CURRENT_STATE = HIGH

    # GPIO4 is XIO-P5 on the CHIP
    GPIO.setup("GPIO4", GPIO.OUT)
    # GPIO3 is XIO-P4 on the CHIP
    GPIO.setup("GPIO3", GPIO.OUT)

    GPIO.output("GPIO4", GPIO.HIGH)
    GPIO.output("GPIO3", GPIO.HIGH)

    while True:
        try:
            # first connection try
            if not connected:
                device = connect()
                connected = True
            if connected:
                for event in device.read_loop():

                    # 28 is the event code for Android button
                    if event.code == 28 and event.value == 1:

                        if GREEN_CURRENT_STATE == HIGH:
                            GPIO.output("GPIO4", GPIO.LOW)
                            print("GREEN LED ON")
                            GREEN_CURRENT_STATE = LOW

                        elif GREEN_CURRENT_STATE == LOW:
                            GPIO.output("GPIO4", GPIO.HIGH)
                            print("GREEN LED OFF")
                            GREEN_CURRENT_STATE = HIGH

                    # 115 is the event code for IOS button.
                    elif event.code == 115 and event.value == 1:

                        if RED_CURRENT_STATE == HIGH:
                            GPIO.output("GPIO3", GPIO.LOW)
                            print("RED LED ON")
                            RED_CURRENT_STATE = LOW

                        elif RED_CURRENT_STATE == LOW:
                            GPIO.output("GPIO3", GPIO.HIGH)
                            print("RED LED OFF")
                            RED_CURRENT_STATE = HIGH

        except (OSError, IOError):
            # try connecting last time
            # if failed then exit the program
            # if connected then continue the inner for loop
            device = connect()
            connected = True