Hello,
I'm new in this forum and I'm doing a my own IOT server with mysql and php but I want to be able to make requests to the server from outside my network (I already have the server mounted and the port open, I need filtering) but only my devices can make requests.

I have something similar to a web api on port 90, and I need to make it so that only the devices I want (arduinos) can make requests to the port 90 api.