Thanks for helping out, could you give me an example of how to check? I’ve just tried going to my router’s address with Firefox for Android, and that seems to work, both with the easy URL (fritz.box) and the IP (192.168.178.1). How can I check if e.g. my computer is reachable from within Firefox for Android?
Edit: I installed an Android terminal app and used ping to check, and it works fine for both my computer and those WiiM devices. Even when ping is running and continuously telling me the device is pinging back, it still doesn’t show up in the WiiM Home app.