Android Bluetooth Low Energy ペアリング 質問する

GATT_INSUFFICIENT_AUTHENTICATION エラーが発生すると、システムがボンディング プロセスを開始します。以下の例では、血糖値モニターの通知と表示を有効にしようとしています。まず、エラーが表示される原因となる血糖値測定特性の通知を有効にしています。

@Override
    public void onDescriptorWrite(BluetoothGatt gatt, BluetoothGattDescriptor descriptor, int status) {
        if (status == BluetoothGatt.GATT_SUCCESS) {
            if (GM_CHARACTERISTIC.equals(descriptor.getCharacteristic().getUuid())) {
                mCallbacks.onGlucoseMeasurementNotificationEnabled();

                if (mGlucoseMeasurementContextCharacteristic != null) {
                    enableGlucoseMeasurementContextNotification(gatt);
                } else {
                    enableRecordAccessControlPointIndication(gatt);
                }
            }

            if (GM_CONTEXT_CHARACTERISTIC.equals(descriptor.getCharacteristic().getUuid())) {
                mCallbacks.onGlucoseMeasurementContextNotificationEnabled();
                enableRecordAccessControlPointIndication(gatt);
            }

            if (RACP_CHARACTERISTIC.equals(descriptor.getCharacteristic().getUuid())) {
                mCallbacks.onRecordAccessControlPointIndicationsEnabled();
            }
        } else if (status == BluetoothGatt.GATT_INSUFFICIENT_AUTHENTICATION) {
            // this is where the tricky part comes

            if (gatt.getDevice().getBondState() == BluetoothDevice.BOND_NONE) {
                mCallbacks.onBondingRequired();

                // I'm starting the Broadcast Receiver that will listen for bonding process changes

                final IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_BOND_STATE_CHANGED);
                mContext.registerReceiver(mBondingBroadcastReceiver, filter);
            } else {
                // this situation happens when you try to connect for the second time to already bonded device
                // it should never happen, in my opinion
                Logger.e(TAG, "The phone is trying to read from paired device without encryption. Android Bug?");
                // I don't know what to do here
                // This error was found on Nexus 7 with KRT16S build of Andorid 4.4. It does not appear on Samsung S4 with Andorid 4.3.
            }
        } else {
            mCallbacks.onError(ERROR_WRITE_DESCRIPTOR, status);
        }
    };

private BroadcastReceiver mBondingBroadcastReceiver = new BroadcastReceiver() {
    @Override
    public void onReceive(final Context context, final Intent intent) {
        final BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
        final int bondState = intent.getIntExtra(BluetoothDevice.EXTRA_BOND_STATE, -1);
        final int previousBondState = intent.getIntExtra(BluetoothDevice.EXTRA_PREVIOUS_BOND_STATE, -1);

        Logger.d(TAG, "Bond state changed for: " + device.getAddress() + " new state: " + bondState + " previous: " + previousBondState);

        // skip other devices
        if (!device.getAddress().equals(mBluetoothGatt.getDevice().getAddress()))
            return;

        if (bondState == BluetoothDevice.BOND_BONDED) {
            // Continue to do what you've started before
            enableGlucoseMeasurementNotification(mBluetoothGatt);

            mContext.unregisterReceiver(this);
            mCallbacks.onBonded();
        }
    }
};