I am having a problem connecting to the ESP Webserver.
I know the ESP local IP and the ESP external IP.
But the ESP is behind multiple routers. In the local (apartment) router I have enabled port forwarding (port 9999) to the ESP. But the apartment router is connected to the floor router, and the floor router is connected to the building router. I can't setup port forwarding in the floor and building routers due to my limited networking experience.
How do I set it up so that I can access the ESP from, for example, a mobile phone browser?