The choice of port wasn't the complaint so much as the choice of IP address. 12.12.12.10 is a real IP address on the Internet, so if you plug this device in somewhere with an Internet connection, it will begin spamming nuisance traffic to some random device out there. It would be better to choose an IP address in one of the private spaces for this purpose.
See, for example, Cloudflare's stories of issues caused by misconfigured systems appropriating the "1.1.1.1" address for their own purposes: https://blog.cloudflare.com/fixing-reachability-to-1-1-1-1-g...