Protection for game server

[FUTURE-SL]

Hello, I'm writing a protection for a game server running on UDP protocol. How can I save connection statuses?
Example: a player sends a pre-authentication payload -> XDP checks it and if all is well, puts it in the list of trusted connections -> all next packets from this connection will be accepted
I need to make it so that a connection is removed from trusted connections if no packets have arrived in the last 10 seconds.
This question is probably not correct to ask here, but I have not found any help on the internet