I did this for my original project [1] but I wanted something simple for the end user. Having to explain a user to visit a specific IP on their device which may not work because of what ever routing issue is not something I wanted to have to deal with. The app does add a dependacy but all Bluetooth characteristics are public and documented [2] so you can use any Bluetooth app to configure the device.

[1] https://sschueller.github.io/posts/vbz-fahrgastinformation/

[2] https://github.com/TechdroidInc/stationdisplay/blob/main/BLE...