Conexión de teclado Bluetooth por CLI a Ubuntu

 You can try running bluetoothctl from the command line, make sure your device is on / ready to be discovered:

$ bluetoothctl
[NEW] Controller AA:BB:CC:DD:EE:FF device-name [default]

Any other bluetooth devices will be listed here. You'll then be inside a [bluetooth] prompt.

First, turn bluetooth power on (if your device is off):

[bluetooth]# power on
Changing power on succeeded

Then, make sure your agent is registered:

[bluetooth]# agent on
Agent registered

[bluetooth]# default-agent 
Default agent request successful

Now you can scan for devices from the console:

[bluetooth]# scan on
Discovery started
[CHG] Controller AA:BB:CC:DD:EE:FF Discovering: yes
[NEW] Device FF:EE:DD:CC:BB:AA Someone's Keyboard

You can manually pair from here as well:

[bluetooth]# pair FF:EE:DD:CC:BB:AA 
Attempting to pair with FF:EE:DD:CC:BB:AA 
[CHG] Device C8:E0:EB:04:52:55 Connected: yes

At this point, you should be prompted to enter a pin code for pairing:

Request PIN code
[agent] Enter PIN code: 12345

Enter a number (eg. 12345), and you will be prompted to input the same number from the device:

[Someone's Keyboard]# 12345

You should then be notified that your keyboard has paired:

[CHG] Device FF:EE:DD:CC:BB:AA Paired: yes

Hopefully this works for you, was trying to solve this for a while before I found any reference to bluetoothctl.

At the end, just trust the device

[bluetooth]# trust FF:EE:DD:CC:BB:AA



Copiado de: 

https://askubuntu.com/questions/701978/how-can-a-bluetooth-keyboard-that-requires-a-code-entry-be-paired-in-the-termina

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