Hello,
I have a doubt regarding the service and action client. In service client, we wait for the service server to be running and then we create a connection with the server
rospy.wait_for_service("/xyz")
service_client = rospy.ServiceProxy("/xyz", Service_Message)
while in action client, we first establish a connection and wait for the action server.
action_client = actionlib.SimpleActionClient(“xyz”, Action_message)
action_client.wait_for_server()
Why is there a difference in the approach when services and actions are so similar and also how is it possible to establish a connection with action server, when it isnt available?
Thanks a lot in advance.