google was again my friend,
I stumbled upon this good web page:
and I begun with these commands :
sudo bluetoothctl
[bluetooth]# scan on
Discovery started
[CHG] Controller 44:2C:05:B6:BD:FF Discovering: yes
[NEW] Device 00:18:00:09:B8:3C BTKB-B83C
[NEW] Device 7C:C5:37:6A:A6:F8 Raxy-iOs-61
[bluetooth]# pair 00:18:00:09:B8:3C
Attempting to pair with 00:18:00:09:B8:3C
[CHG] Device 00:18:00:09:B8:3C Connected: yes
[agent] PIN code: 233649
[CHG] Device 00:18:00:09:B8:3C Modalias: usb:v0DC6p3752d1001
[CHG] Device 00:18:00:09:B8:3C UUIDs: 00001124-0000-1000-8000-00805f9b34fb
[CHG] Device 00:18:00:09:B8:3C UUIDs: 00001200-0000-1000-8000-00805f9b34fb
[CHG] Device 00:18:00:09:B8:3C Paired: yes
Pairing successful
[CHG] Device 00:18:00:09:B8:3C Connected: no
[bluetooth]# connect 00:18:00:09:B8:3C
Attempting to connect to 00:18:00:09:B8:3C
[CHG] Device 00:18:00:09:B8:3C Connected: yes
Connection successful
[CHG] Device 7C:C5:37:6A:A6:F8 RSSI: -71
[CHG] Device 7C:C5:37:6A:A6:F8 RSSI: -60
[BTKB-B83C]# trust 00:18:00:09:B8:3C
[CHG] Device 00:18:00:09:B8:3C Trusted: yes
Changing 00:18:00:09:B8:3C trust succeeded
And voilà !
I was able to type (on the hdmi tty session) my login and password from my very old KeySonic 340-BT Bluetooth Keyboard!
EDIT:
Does it survive the kvim reboots ? YES indeed, it does !
The only remaining problem is the layout, but I thing it’s time to do some reconfiguration to fix it…
And I also need to check if the trackpad will be able to work under the X11 GUI, once I manage to have one running on the kvim