[BRLTTY] Raspberry PI 3, BRLTTY 5.5, BrailleNote Apex, Trouble connecting using bluetooth

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Hi all,

I have been experimenting with BRLTTY on the Raspberry Pi over the past 
couple of days and have been unable to get it to work with my 
BrailleNote Apex over bluetooth. I was able to use bluetoothctl 
successfully to pair the device but not to connect it. When I 
initialized brltty with the bluetooth address of the display using the 
bn driver, I got the following error in the log output:

2017-12-28 at 17:14:06.604 [brltty] checking for braille driver: bn
2017-12-28 at 17:14:06.604 [brltty] initializing braille driver: bn -> 
bluetooth:00:25:EC:01:10:8A
2017-12-28 at 17:14:06.604 [brltty] unsupported generic resource 
identifier: bluetooth:00:25:EC:01:10:8A
2017-12-28 at 17:14:06.604 [brltty] braille driver initialization failed: 
bn -> bluetooth:00:25:EC:01:10:8A

When I tried the hw driver, I got this error: bthNewConnectionExtension 
error 38: Function not implemented.

I am using the official release version 5.5 of brltty (which I compiled 
from source) under Raspbian Jessie and bluez 5.

I am relatively new to using brltty, so perhaps I am doing something 
wrong with my setup or the device simply isn't supported over bluetooth?

Any help would be appreciated.

Thank you.