helloworld.py
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	#!/usr/bin/python
	# -- coding: utf-8 --
	import os, sys

	# add ../../Sources to the PYTHONPATH
	sys.path.append(os.path.join("..", "..", "Sources"))
	from yocto_api import *
	from yocto_led import *


	def usage():
	scriptname = os.path.basename(sys.argv[0])
	print("Usage:")
	print(scriptname + ' <serial_number>')
	print(scriptname + ' <logical_name>')
	print(scriptname + ' any ')
	sys.exit()


	def die(msg):
	sys.exit(msg + ' (check USB cable)')


	def setLedState(led, state):
	if led.isOnline():
	if state:
	led.set_power(YLed.POWER_ON)
	else:
	led.set_power(YLed.POWER_OFF)
	else:
	print('Module not connected (check identification and USB cable)')


	errmsg = YRefParam()

	if len(sys.argv) < 2:
	usage()

	target = sys.argv[1]

	# Setup the API to use local USB devices
	if YAPI.RegisterHub("usb", errmsg) != YAPI.SUCCESS:
	sys.exit("init error" + errmsg.value)

	if target == 'any':
	# retreive any RGB led
	led = YLed.FirstLed()
	if led is None:
	die('No module connected')
	else:
	led = YLed.FindLed(target + '.led')

	if not (led.isOnline()):
	die('device not connected')

	print('0: turn test led OFF')
	print('1: turn test led ON')
	print('x: exit')

	try:
	input = raw_input # python 2.x fix
	except:
	pass

	c = input("command:")

	while c != 'x':
	if c == '0':
	setLedState(led, False)
	elif c == '1':
	setLedState(led, True)
	c = input("command:")
	YAPI.FreeAPI()