How to automatically accept bluetooth pair request without popping confirmation dialogue box in raspberry pi through terminal or through SSH

Question

I need to accept the bluetooth pair request in raspberry pi without manual confirmation. My task is to send a pair request from Android phone to raspberry pi 3 and to automatically accept the pair request based on MAC address of mobile, But it asking manual confirmation in raspberry pi, how can i automatically accept the request,

when i pass the below commands .bluetoothctl .power on .discoverable on and made a request from Android device, manual confirmation is asking for authentication

how to achieve this, without manual confirmation

Answer 1

As ukBaz suggested, you can do this by setting your IO capabilities to NoInputNoOutput.I would recommend sending the following sequence of commands to achieve this:-

sudo btmgmt power off
sudo btmgmt discov on
sudo btmgmt connectable on
sudo btmgmt pairable on
sudo btmgmt power on
sudo btmgmt io-cap 3

The last command sets your IO capabilities to NoInputNoOutput, and the numberical values correspond to the following:-

0       DisplayOnly
1       DisplayYesNo
2       KeyboardOnly
3       NoInputNoOutput
4       KeyboardDisplay

You can then set this with bluetoothctl as well via the following commands:-

bluetoothctl --agent NoInputNoOutput

Have a look at the links below for more info:-

• Raspberry Pi BLE pairing/encryption
• BLE pairing the Raspberry Pi 3 Model B
• Bluetoothctl set passkey