Turn on LED while unconfigured

is it possible to turn on a LED (via GPIO), while Raspberry Pi is waiting to be configured thru BerryLan?
If connected to a Wifi network or acting by himself as an Access Point, the LED should turn off.
Thank you for any advice

Currently that isn’t possible. It would require a patch to nymea-networkmanager. Shouldn’t be too hard to do, as there is already code that deals with GPIO access (for the push button).