BebopPublisherSubscriberCode

import rospy
from std_msgs.msg import Empty
#from bebop_msgs.msg import Ardrone3PilotingStateFlyingStateChanged
def callback(data):

	time2 = float(rospy.Time.now().secs)
	rospy.loginfo('received: %.2f' % time2-time1)

def latencyTest():

	# Create a node
	rospy.init_node('latency_tester', anonymous=True)

	# Set up topics to publish
	pub_takeoff = rospy.Publisher("bebop/takeoff", Empty, queue_size=10)
	pub_land = rospy.Publisher("bebop/land", Empty, queue_size=10)


	# Need to check topic name and data type for changed flight
	# syntax: rospy.Subscriber(Topic name, Data/msg type, Callback fcn)
	#rospy.Subscriber("states/ARDrone3/PilotingState/FlyingStateChanged", Ardrone3PilotingStateFlyingStateChanged, callback)
	#rospy.Subscriber("states/ARDrone3/PilotingState/FlyingStateChanged", bebop_msgs/Ardrone3PilotingStateFlyingStateChanged, callback)

	#rospy.spin()
	rospy.sleep(1) # NOTE: We must let the subscriber initialize
	pub_takeoff.publish(Empty())
	rospy.loginfo('Takeoff sent!')
	rospy.sleep(3)
	pub_land.publish(Empty())
	rospy.loginfo('Land sent!')
	#time1 = float(rospy.Time.now().secs)

if __name__ == _main_:
try:

		latencyTest()
	except rospy.ROSInterruptException:
		pass