def ping(device_name):
"""Like ping, but block until completion and return the success
status"""
return wait_for_async(lambda cb :
start_ping(device_name, cb))
def poweroff(device_name, max_time=30):
"""Like start_poweroff, but block until completion and return the success
status"""
return wait_for_async(lambda cb :
start_poweroff(device_name, cb, max_time))