feat(android): request mtu

android/manifest

@@ -2,7 +2,7 @@
 # this is your module manifest and used by Titanium
 # during compilation, packaging, distribution, etc.
 #
-version: 2.0.0
+version: 2.0.1
 apiversion: 4
 architectures: arm64-v8a armeabi-v7a x86 x86_64
 description: Provides BluetoothLowEnergy module for Titanium applications.

android/src/appcelerator/ble/TiBLECentralManagerProxy.java

@@ -234,6 +234,14 @@ public void cancelPeripheralConnection(KrollDict dict)
 		bleService.cancelPeripheralConnection(peripheralProxy);
 	}
 
+	@Kroll.method
+	public void requestMtu(KrollDict dict)
+	{
+		if (dict != null && dict.containsKey("mtu")) {
+			bleService.requestMtu(dict.getInt("mtu"));
+		}
+	}
+
 	public void cleanup()
 	{
 		try {

android/src/appcelerator/ble/TiBLEManageCentralService.java

@@ -138,6 +138,11 @@ public void handleBluetoothTurnedOff()
 		centralOperationManager.handleDisconnection(BluetoothGatt.GATT_FAILURE);
 	}
 
+	public void requestMtu(int value)
+	{
+		centralOperationManager.requestMtu(value);
+	}
+
 	public void readValueForCharacteristic(TiBLECharacteristicProxy characteristicProxy)
 	{
 		centralOperationManager.readValueForCharacteristic(characteristicProxy);

android/src/appcelerator/ble/TiBleCentralOperationManager.java

@@ -17,11 +17,12 @@
 import android.content.Context;
 import android.os.Build;
 import android.util.Log;
+import androidx.annotation.RequiresApi;
 import java.util.UUID;
 import org.appcelerator.kroll.KrollDict;
 import ti.modules.titanium.BufferProxy;
 
-@SuppressLint("LongLogTag")
+@SuppressLint({ "LongLogTag", "MissingPermission" })
 public class TiBleCentralOperationManager
 {
 
@@ -102,6 +103,13 @@ public void onDescriptorWrite(BluetoothGatt gatt, BluetoothGattDescriptor descri
 				super.onDescriptorWrite(gatt, descriptor, status);
 				handleOnDescriptorWrite(descriptor, status);
 			}
+
+			@Override
+			public void onMtuChanged(BluetoothGatt gatt, int mtu, int status)
+			{
+				super.onMtuChanged(gatt, mtu, status);
+				handleOnMtuChanged(mtu, status);
+			}
 		});
 		connectionState = ConnectionState.Connecting;
 	}
@@ -240,6 +248,13 @@ private void handleOnDescriptorWrite(BluetoothGattDescriptor descriptor, int sta
 		peripheralProxy.fireEvent(KeysConstants.didWriteValueForDescriptor.name(), dict);
 	}
 
+	private void handleOnMtuChanged(int mtu, int status)
+	{
+		KrollDict dict = new KrollDict();
+		dict.put("mtu", mtu);
+		peripheralProxy.fireEvent("mtuChanged", dict);
+	}
+
 	public void cancelPeripheralConnection()
 	{
 		connectionState = ConnectionState.Disconnecting;
@@ -267,6 +282,12 @@ public void requestConnectionPriority(int priority)
 		}
 	}
 
+	@RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
+	public void requestMtu(int value)
+	{
+		bluetoothGatt.requestMtu(value);
+	}
+
 	public void discoverServices()
 	{
 		bluetoothGatt.discoverServices();

apidoc/CentralManager.yml

@@ -25,7 +25,7 @@ properties:
     type: Array<Modules.BLE.Peripheral>
     platforms: [android, iphone, ipad]
     since: "1.0.0"
-    
+
 methods:
   - name: isAccessFineLocationPermissionGranted
     summary: Determines whether the ACCESS_FINE_LOCATION permission is granted or not.
@@ -45,6 +45,11 @@ methods:
     since: "1.0.0"
     platforms: [android]
 
+  - name: requestMtu
+    summary: Request MTU change
+    since: "2.0.1"
+    platforms: [android]
+
   - name: createPeripheral
     summary: Creates a Modules.BLE.Peripheral class object with the given address.
     since: "1.0.0"
@@ -118,7 +123,7 @@ methods:
         summary: A list of services UUIDs.
         optional: true
     returns:
-      type: void  
+      type: void
 
   - name: cancelPeripheralConnection
     summary: Cancels an active or pending connection to peripheral. Note that this is non-blocking, and any Peripheral
@@ -131,7 +136,7 @@ methods:
         summary: peripheral object which connnection will be canceled
         optional: false
     returns:
-      type: void 
+      type: void
 
   - name: connectPeripheral
     summary: Initiates a connection to peripheral. Connection attempts never time out and, depending on the outcome, will result
@@ -150,7 +155,7 @@ methods:
          all available dictionary keys are defined as Modules.BLE.CONNECT_PERIPHERAL_OPTIONS_KEY_*
         optional: true
     returns:
-      type: void 
+      type: void
 
 events:
   - name: didUpdateState
@@ -167,12 +172,21 @@ events:
       - name: state
         type: Number
         summary: state of central manager
-
+
+  - name: mtu
+    summary: Fired after an MTU request
+    platforms: [android]
+    since: "2.0.1"
+    properties:
+      - name: mtu
+        type: Number
+        summary: MTU value
+
 
   - name: willRestoreState
     summary: A event called when centrel manager will restore state
     description: |
-         For apps that opt-in to state preservation and restoration, this is the first event invoked when your app is relaunched into 
+         For apps that opt-in to state preservation and restoration, this is the first event invoked when your app is relaunched into
          the background to complete some Bluetooth-related task. Use this method to synchronize your app's state with the state of the
          Bluetooth system.
     platforms: [iphone, ipad]
@@ -232,7 +246,7 @@ events:
         summary: The error domain; only present if an error occurred..
       - name: errorDescription
         type: String
-        summary: The error description; only peresent if an  
+        summary: The error description; only peresent if an
 
   - name: didDisconnectPeripheral
     summary: This event is called when a peripheral disconnected.