when the camping meter gets to about 80% it start to playing the hearhbeating sound, getting louder untill the camping meter hits 100%, and it keeping playing the sound till you move off and the camping meter drops again.
EDIT found a mistake in my .cfg file.
It should be 2=Breathing not 3=Breathing
Open it up and change the first comand from "anticamping 3" to "anticamping 2" if you want the hear the heartbeat when someone is camping.