Well think of it like this lets say this wasn't and security system and it was a video game console and remote.
Now the console or keypad or the main components the power on or shut off the devices and the remote or sensors are the secondary parts but they are needed to help the console or keypad figure out what they are doing.
The answer is NO.
Thats what makes UDP connectionless. Aclient that is going to
send a UDP message to the server just sends it.The server does not know it is
coming untill it arrives .When a server recieves a UDP message it gets the
source address/port and the data.