I'm developing a cross-browser and cross-platform PWA for a camera slider. The idea is that a Raspberry Pi is serving a web interface for controlling this and also serves as an access point so it can be used without an Internet connection.
But since PWAs need the HTTPS protocol I don't know how I can serve my web application over HTTPS in a local network. Certificates are bought for domain names and not for a local IP address.
I do not want my customers to have to accept an "unsecure" private certificate every time before they can use my application.
Is there even a solution for my problem?