[Bug 1857891] [NEW] Authentication code required for keyboardless device

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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

** Affects: gnome-bluetooth (Ubuntu)
     Importance: Undecided
         Status: Incomplete


** Tags: bionic
-- 
Authentication code required for keyboardless device
https://bugs.launchpad.net/bugs/1857891
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