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

	# add ../../Sources to the PYTHONPATH
	sys.path.append(os.path.join("yoctoLib.python.26380/Sources"))
	from yocto_api import *
	from yocto_relay import *
	from exceptions import YoctoConnectionError


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

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

	if not (relay.isOnline()):
	raise YoctoConnectionError('device offline')

	off(relay)
	return relay


	def on(relay):
	relay.set_state(YRelay.STATE_A)


	def off(relay):
	relay.set_state(YRelay.STATE_B)