elmicha

If you happen to have a Fritzbox with VoIP capability it contains a SIP server and you can register SIP clients on it (e.g. Fritz App Fon, linphone, twinkle) and use them to phone internally.

You can use your phone with mobile connection (not WiFi) to check if it can see the file that you made available on your web server.

You’re correct that it won’t draw 650W. You could get a power meter or a power measuring plug and measure the energy consumption.

Check if MariaDB has that JSON datatype:

https://github.com/wallabag/wallabag/issues/6659#issuecomment-1602507604