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

	from yocto_api import *


	def logfun(m, s):
	print(m.get_serialNumber() + ' : ' + s)


	def deviceArrival(m):
	serial = m.get_serialNumber()
	print('Device arrival : ' + serial)
	m.registerLogCallback(logfun)


	def deviceRemoval(m):
	print('Device removal : ' + m.get_serialNumber())


	errmsg = YRefParam()

	# No exception please
	YAPI.DisableExceptions()

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

	YAPI.RegisterDeviceArrivalCallback(deviceArrival)
	YAPI.RegisterDeviceRemovalCallback(deviceRemoval)

	print('Hit Ctrl-C to Stop ')
	while True:
	YAPI.UpdateDeviceList(errmsg) # traps plug/unplug events
	YAPI.Sleep(500, errmsg) # traps others events