I'm trying to pair with BLE device by ACTION_PAIRING_REQUEST broadcast receiver but always receive PAIRING_VARIANT_DISPLAY_PASSKEY pairing type instead of PAIRING_VARIANT_PIN i expected. How can i change it to PAIRING_VARIANT_PIN? My remote device don't have display i have no idea why it using display passkey by default.
Both devices tell each other their own input/output capabilities. Based on that the Bluetooth standard defines which pairing variant should be used on each device.
So if your peripheral device doesn't have a display, but has a keyboard, then it's logical that the Android device shows the passkey and that passkey is supposed to be input on your peripheral device.