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    <p>When you get the GATT_INSUFFICIENT_AUTHENTICATION error, the system starts the bonding process for you. In the example below I'm trying to enable notifications and indications on glucose monitor. First I'm enabling the notifications on Glucose Measurement characteristic which can cause the error to appear.</p> <pre><code>@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); } }; </code></pre> <p>Where the mBondingBroadcastReceiver is:</p> <pre><code>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(); } } }; </code></pre> <p>Remember to unregister the broadcast receiver when exiting the activity. It may have not been unregistered by the receicver itself.</p>
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    1. POAndroid Bluetooth Low Energy Pairing
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    1. POAndroid Bluetooth Low Energy Pairing
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    1. COThanks for the answer! On a 4.3 Nexus 7, the problem is that there is no callback when the read fails due to authentication. It just prints status 5 to the console and dies. I will check and see if I can get the BondStateChanged intent even though there was no callback from the read. I suspect I might have to call create bond (4.4 API) at the beginning to kick of the process, which I will try when my Nexus 7 gets updated.
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    2. COI can confirm that this now works with 4.4. When I try to read an encrypted char, the bonding and key exchange is kicked off. While I do not get back status 5, I do get back a status 137 (not sure what this is) as a response to the char read when the bonding is complete. I can then read the encrypted char again to retrieve the data. The paired device also shows up in the Bluetooth device list.
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    3. COYes, it was fixed on Nexuses with Android 4.4.1. Right now the error NO 5 (insufficient authentication) does not came at all so you have to register the bonding broadcast listener earlier (f.r before calling connectGatt(..). Here you can find more error numbers: https://android.googlesource.com/platform/external/bluetooth/bluedroid/+/android-4.4.2_r1/stack/include/gatt_api.h
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