[Bug] cannot build keyboards/hhkb/yang with `BLUETOOTH_ENABLE`

[orumin]

Describe the Bug

keyboards/hhkb/yang is code for HHKB with modified version controller to support Bluetooth Low Energy. but this code cannot build with BLUETOOTH_ENABLE = yes since this code is merged into master.

the code for this keyboard calls no exist API to control Adafruit UART friends, I guess.

Keyboard Used

hhkb/yang

Link to product page (if applicable)

No response

Operating System

WSL/Ubuntu 22.04

qmk doctor Output

Ψ QMK Doctor is checking your environment.
Ψ CLI version: 1.1.2
Ψ QMK home: /home/orumin/qmk_firmware/hhkb_yang_orumin
Ψ Detected Linux (WSL, Ubuntu 22.04.3 LTS).
⚠ QMK home does not appear to be a Git repository! (no .git folder)
Ψ All dependencies are installed.
Ψ Found arm-none-eabi-gcc version 10.3.1
Ψ Found avr-gcc version 5.4.0
Ψ Found avrdude version 6.3-20171130
Ψ Found dfu-programmer version 0.6.1
Ψ Found dfu-util version 0.9
Ψ Submodules are up to date.
Ψ Submodule status:
Ψ - lib/chibios: 2023-04-15 13:48:04 +0000 --  (11edb1610)
Ψ - lib/chibios-contrib: 2023-07-17 11:39:05 +0200 --  (da78eb3)
Ψ - lib/googletest: 2021-06-11 06:37:43 -0700 --  (e2239ee)
Ψ - lib/lufa: 2022-08-26 12:09:55 +1000 --  (549b973)
Ψ - lib/vusb: 2022-06-13 09:18:17 +1000 --  (819dbc1)
Ψ - lib/printf: 2022-06-29 23:59:58 +0300 --  (c2e3b4e)
Ψ - lib/pico-sdk: 2023-02-12 20:19:37 +0100 --  (a3398d8)
Ψ - lib/lvgl: 2022-04-11 04:44:53 -0600 --  (e19410f)
Ψ QMK is ready to go, but minor problems were found

qmk doctor reports warning of git, this is expected behavior because I use git-worktree(1) to checkout code from multiple branch at same time.

### Is AutoHotKey / Karabiner installed

- [ ] AutoHotKey (Windows)
- [ ] Karabiner (macOS)

### Other keyboard-related software installed

_No response_

### Additional Context

_No response_

[fauxpark]

The HHKB Bluetooth code was removed due to bitrot.

[orumin]

@fauxpark you say about version of RN42 controller. YANG's mod wan't removed

[orumin]

https://github.com/qmk/qmk_firmware/tree/master/keyboards/hhkb/yang here is code.

[orumin]

@fauxpark could you re-open this issue? I tried to create PR to resolve this issue. to resolve issue, maintain above linked code, or remove those of code, I think

[fauxpark]

The Bluefruit LE code needs some serious rework first which most likely will not incorporate any of these changes.

[orumin]

If so that, remove BLE and related functions from feature list in keyboards/hhkb/yang/readme.md will be better than resolve this issue with no change. the description in hhkb/yang makes confuse and loss time other users.