Thanks for letting me know which app you are using. I'll need to take a look as it looks like it is connecting to the console terminal. Not sure if that is standard practice for SPP.
Just to confirm this is the app you are looking at:
The apps I have been using with my SPP python code are:
And creating my own Android client app with MIT's App Inventor:
Is it actually connecting to the console that you want to do over Bluetooth?
To answer your questions:
When I used the default bluetooth menu to connect, the connection was "successfull" (But no log was shown in the spp-profiler, as I supposed it showed because the NewConnection method, or not?).
I think this means you are connecting but not with SPP
That controller address: 00:00:00:00:5A:AD is ok?
Yes this is fine.
If I run hciconfig -a the service classes are: Rendering and Capturing.
hciconfig is deprecated. A better way to do this is with bluetoothctl and the show command.
Would be interested in the output from bluetoothctl.
As some point you might want to remove the pairing information from your phone and Dragonboard and start again.
On the dragonboard you can remove the device using 'remove ' with in bluetoothctl. To get the list of devices simply type 'devices'