I'm trying to configuring this Apple Keyboard with usb dongle but i've still no success. This is the output of my tests:

 pi@retropie:~ $ bluetoothctl 
[NEW] Controller 00:1A:7D:DA:71:13 retropie [default]
[NEW] Device E4:8B:7F:19:02:27 Tastiera di System Administrator
[bluetooth]# power on
Changing power on succeeded
[bluetooth]# agent KeyboardOnly
Agent registered
[bluetooth]# default-agent
Default agent request successful
[bluetooth]# pairable on
Changing pairable on succeeded
[bluetooth]# scan on
Discovery started
[CHG] Controller 00:1A:7D:DA:71:13 Discovering: yes
[bluetooth]# pair E4:8B:7F:19:02:27                                      
Attempting to pair with E4:8B:7F:19:02:27
Failed to pair: org.bluez.Error.AlreadyExists
[bluetooth]# trust E4:8B:7F:19:02:27
Changing E4:8B:7F:19:02:27 trust succeeded
[bluetooth]# connect E4:8B:7F:19:02:27
Attempting to connect to E4:8B:7F:19:02:27
Connection successful
[bluetooth]# quit
Agent unregistered
[DEL] Controller 00:1A:7D:DA:71:13 retropie [default]
pi@retropie:~ $

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