Hi vpeter
Long time buntu & kodi user, first time LibreELEC, loving it so far
Thanks so much for working on this, its hugely exciting to be able to use add-ons to extend the functionality of LibreELEC in this way.
I've installed from scratch on a Pi 3 Model B+, installed the add-on for MariaSQL and experienced very similar behaviour to that described in previous posts.
From install the autogenerated root password did not work (couldn't log-in to sql command line), the kodi autogenerated password did work.
Manually changing the passwords in the app resulted in not being able to log in to sql with either account.
Uninstalling the add-on and retrying had no effect, still no joy.
On checking the logs each log-in attempt was met with a message saying that the account chosen wasn't allowed to connect from the machines IP.
let me know if you need logs etc, happy to provide or test anything you want me to try.
For reference removing the plug-in and running maria-sql via docker worked first time..........