在使用特定特征时，可以通过

You can force the device has to be paired, when using specific characteristics by protecting them with PERMISSION_READ_ENCRYPTED_MITM or PERMISSION_WRITE_ENCRYPTED_MITM.

客户端/中间端可以通过调用 BluetoothDevice来强制配对.creteBond().

The client/central side can force pairing by calling BluetoothDevice.creteBond().

配对方法本身由蓝牙协议决定(请参见此线程)

The pairing method itself is determinated by the bluetooth protocol (see this thread)