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_relay import *


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


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


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

	target = sys.argv[1].upper()
	state = sys.argv[2].upper()

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

	if target == 'ANY':
	# retreive any Relay
	relay = YRelay.FirstRelay()
	if relay is None:
	die('no device connected')
	else:
	relay = YRelay.FindRelay(target + ".relay1")

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

	if state == 'A':
	relay.set_state(YRelay.STATE_A)
	else:
	relay.set_state(YRelay.STATE_B)
	YAPI.FreeAPI()