Note https://github.com/adrianmihalko/raspberrypiwireguard has some outdated script responses in it. I learned this the hard way.
Re:How to Make a Raspberry Pi VPN Server
by forgingahead on Tuesday January 14, 2020 @11:34PM
(#22051786)
Are you able to submit a PR with the updated information? Thanks!
https://github.com/adrianmihalko/raspberrypiwireguard
https://grh.am/2018/wireguard-setup-guide-for-ios/