Don't you have to get into the app to tell it when? In the video, everyone was holding up a phone to open the door...
With bluetooth most likely yes, the holding up to the door is probably theatrics. Its also what people are familiar with when performing NFC/contactless payments. NFC has a limited range so you need to hold up the phone/card to the terminal to initiate the handshake.
 
				 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		
 
 
		
 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		







 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		