How to implement connection blocking on UDP port?

Question

Network routing

Good day to all. Dear, maybe someone will be able to tell.
There is a TP-Link 841N router. It is necessary to implement blocking of incoming and outgoing connections on the UDP port (for example, UDP 3074) for several devices connected via wi-fi (IP-addresses of devices and mac-addresses are known). I do not quite understand how to form a rule for access control. Used standard software from TP-Link.

Answer 1

two separate rules will be needed for incoming and outgoing (see "Direction" parameter)
Upd. How well this works is a separate question. I mainly use such routers as stupid access points within the local network, I only configure wi-fi on them and turn off dhcp. The protection capabilities of such routers are toy. But I agree that in the absence of something more serious , you can try to set it up on this.