Upstream is onto it now so the discussion should stay there:
https://gitlab.gnome.org/GNOME/gnome-bluetooth/issues/57

** Bug watch added: gitlab.gnome.org/GNOME/gnome-bluetooth/issues #57
   https://gitlab.gnome.org/GNOME/gnome-bluetooth/issues/57

** Also affects: gnome-bluetooth via
   https://gitlab.gnome.org/GNOME/gnome-bluetooth/issues/57
   Importance: Unknown
       Status: Unknown

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to gnome-bluetooth in Ubuntu.
https://bugs.launchpad.net/bugs/1857891

Title:
  Authentication code required for keyboardless device

Status in GNOME Bluetooth:
  Unknown
Status in gnome-bluetooth package in Ubuntu:
  Confirmed

Bug description:
  Hi,

  I'm trying to connect a turn page pedal which acts partly as a two-
  button mouse (provides left- and right-click depending on the pedal
  you press) and partly as a keyboard (can send keycodes as enter,
  space, left, right, PgUp or PgDn...).

  It only has two pedals and no keyboard (see it on manufacturer's site:
  https://www.donnerdeal.com/products/donner-bluetooth-page-turner-
  pedal-for-tablets-ipad-rechargeable-
  black?_pos=4&_sid=b8e2efbcf&_ss=r).

  Whenever I try to connect it to bluez, it asks me for an
  authentication code which is impossible to provide, of course.

  I've search deeply but couldn't find any means to automatically
  "trust" my pedal.

  I've tried it on Windows and Android: it functions smoothly...

  Thank you in advance

  Some information:

  hciconfig -a

  hci0: Type: Primary  Bus: USB
        BD Address: 00:16:38:CA:9D:64  ACL MTU: 1017:8  SCO MTU: 64:0
        UP RUNNING PSCAN 
        RX bytes:6435 acl:95 sco:0 events:271 errors:0
        TX bytes:3151 acl:76 sco:0 commands:126 errors:0
        Features: 0xff 0xff 0x8d 0xfe 0x9b 0xfd 0x00 0x80
        Packet type: DM1 DM3 DM5 DH1 DH3 DH5 HV1 HV2 HV3 
        Link policy: RSWITCH HOLD SNIFF PARK 
        Link mode: SLAVE ACCEPT 
        Name: 'HP-t520-Flexible-Series-TC'
        Class: 0x0c0104
        Service Classes: Rendering, Capturing
        Device Class: Computer, Desktop workstation
        HCI Version: 2.0 (0x3)  Revision: 0x2000
        LMP Version: 2.0 (0x3)  Subversion: 0x415c
        Manufacturer: Broadcom Corporation (15)

  bluetoothctl --version

  bluetoothctl: 5.48

  bluetoothctl

  [NEW] Controller 00:16:38:CA:9D:64 HP-t520-Flexible-Series-TC [default]
  [NEW] Device 08:29:17:24:83:49 ZX1679    
  [NEW] Device 50:E6:66:03:72:8C Bluetooth Music Pedal
  Agent registered

  [Bluetooth Music Pedal]# show
  Controller 00:16:38:CA:9D:64 (public)
        Name: HP-t520-Flexible-Series-TC
        Alias: HP-t520-Flexible-Series-TC
        Class: 0x000c0104
        Powered: yes
        Discoverable: no
        Pairable: yes
        UUID: Headset AG                (00001112-0000-1000-8000-00805f9b34fb)
        UUID: Generic Attribute Profile (00001801-0000-1000-8000-00805f9b34fb)
        UUID: A/V Remote Control        (0000110e-0000-1000-8000-00805f9b34fb)
        UUID: Generic Access Profile    (00001800-0000-1000-8000-00805f9b34fb)
        UUID: PnP Information           (00001200-0000-1000-8000-00805f9b34fb)
        UUID: A/V Remote Control Target (0000110c-0000-1000-8000-00805f9b34fb)
        UUID: Audio Source              (0000110a-0000-1000-8000-00805f9b34fb)
        UUID: Audio Sink                (0000110b-0000-1000-8000-00805f9b34fb)
        UUID: Headset                   (00001108-0000-1000-8000-00805f9b34fb)
        Modalias: usb:v1D6Bp0246d0530
        Discovering: no

  [Bluetooth Music Pedal]# devices
  Device 08:29:17:24:83:49 ZX1679    
  Device 50:E6:66:03:72:8C Bluetooth Music Pedal

  [Bluetooth Music Pedal]# info 50:E6:66:03:72:8C
  Device 50:E6:66:03:72:8C (public)
        Name: Bluetooth Music Pedal
        Alias: Bluetooth Music Pedal
        Class: 0x00000540
        Icon: input-keyboard
        Paired: no
        Trusted: yes
        Blocked: no
        Connected: yes
        LegacyPairing: no
        UUID: Human Interface Device... (00001124-0000-1000-8000-00805f9b34fb)
        UUID: PnP Information           (00001200-0000-1000-8000-00805f9b34fb)
        Modalias: usb:v04E8p7021d0102

  rfkill list

  0: hci0: Bluetooth
        Soft blocked: no
        Hard blocked: no
  1: phy0: Wireless LAN
        Soft blocked: no
        Hard blocked: no
  --- 
  ProblemType: Bug
  ApportVersion: 2.20.9-0ubuntu7.9
  Architecture: amd64
  CurrentDesktop: LXDE
  DistroRelease: Ubuntu 18.04
  InstallationDate: Installed on 2019-02-25 (308 days ago)
  InstallationMedia: Lubuntu 16.04.3 LTS "Xenial Xerus" - Release amd64 
(20170801)
  Package: gnome-bluetooth 3.28.0-2ubuntu0.2
  PackageArchitecture: amd64
  ProcVersionSignature: Ubuntu 4.15.0-72.81-generic 4.15.18
  Tags:  bionic
  Uname: Linux 4.15.0-72-generic x86_64
  UpgradeStatus: Upgraded to bionic on 2019-02-25 (308 days ago)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True

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