Modified code to allow auto paring

- added intent and action to pair automatically with ble device
- in createBond passing peripheralUUID and pin will pair with that peripheral automatically
- just passing peripheralUUID will ask for pin (manual action)

Author: Siddaiah M

BleManager.js

@@ -131,9 +131,9 @@ class BleManager {
     });
   }
 
-  createBond(peripheralId) {
+  createBond(peripheralId,peripheralPin=null) {
     return new Promise((fulfill, reject) => {
-      bleManager.createBond(peripheralId, error => {
+      bleManager.createBond(peripheralId,peripheralPin, error => {
         if (error) {
           reject(error);
         } else {

android/src/main/java/it/innove/BleManager.java

@@ -44,12 +44,19 @@ class BleManager extends ReactContextBaseJavaModule implements ActivityEventList
 
 	private class BondRequest {
 		private String uuid;
+		private String pin;
 		private Callback callback;
 
 		BondRequest(String _uuid, Callback _callback) {
 			uuid = _uuid;
 			callback = _callback;
 		}
+
+		BondRequest(String _uuid, String _pin, Callback _callback) {
+			uuid = _uuid;
+			pin = _pin;
+			callback = _callback;
+		}
 	}
 
 	private BluetoothAdapter bluetoothAdapter;
@@ -124,6 +131,9 @@ public void start(ReadableMap options, Callback callback) {
 		IntentFilter filter = new IntentFilter(BluetoothAdapter.ACTION_STATE_CHANGED);
 		filter.addAction(BluetoothDevice.ACTION_BOND_STATE_CHANGED);
 		context.registerReceiver(mReceiver, filter);
+		IntentFilter intentFilter = new IntentFilter(BluetoothDevice.ACTION_PAIRING_REQUEST);
+        intentFilter.setPriority(IntentFilter.SYSTEM_HIGH_PRIORITY);
+        context.registerReceiver(mReceiver, intentFilter);
 		callback.invoke();
 		Log.d(LOG_TAG, "BleManager initialized");
 	}
@@ -193,7 +203,7 @@ public void stopScan(Callback callback) {
 	}
 
 	@ReactMethod
-	public void createBond(String peripheralUUID, Callback callback) {
+	public void createBond(String peripheralUUID, String peripheralPin, Callback callback) {
 		Log.d(LOG_TAG, "Request bond to: " + peripheralUUID);
 
 		Set<BluetoothDevice> deviceSet = getBluetoothAdapter().getBondedDevices();
@@ -213,7 +223,7 @@ public void createBond(String peripheralUUID, Callback callback) {
 			return;
 		} else if (peripheral.getDevice().createBond()) {
 			Log.d(LOG_TAG, "Request bond successful for: " + peripheralUUID);
-			bondRequest = new BondRequest(peripheralUUID, callback); // request bond success, waiting for boradcast
+			bondRequest = new BondRequest(peripheralUUID, peripheralPin, callback); // request bond success, waiting for boradcast
 			return;
 		}
 
@@ -529,6 +539,12 @@ public void onReceive(Context context, Intent intent) {
 					removeBondRequest.callback.invoke();
 					removeBondRequest = null;
 				}
+			} else if (action.equals(BluetoothDevice.ACTION_PAIRING_REQUEST)){
+				BluetoothDevice bluetoothDevice = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
+				if (bondRequest != null && bondRequest.uuid.equals(bluetoothDevice.getAddress()) && bondRequest.pin != null) {
+					bluetoothDevice.setPin(bondRequest.pin.getBytes());
+					bluetoothDevice.createBond();
+				}
 			}
 
 		}