Writing to Immediate Alert characteristic not working

[228313]

I am using a nrf51822 based tag and Android official SDK to implement my custom app. I perform the following steps:

    1. Scan
    2. Connect
    3. Discover services
    4. Write 0X01 to immediate alert characteristic

Here is the code

 BluetoothGattService alertService = mBluetoothGatt.getService(BleDefinedUUIDs.Service.IMMEDIATE_ALERT_UUID);
 BluetoothGattCharacteristic alertLevel = alertService.getCharacteristic(BleDefinedUUIDs.Characteristic.ALERT_LEVEL_UUID);
 alertLevel.setValue(1, BluetoothGattCharacteristic.FORMAT_UINT8, 0);       
 boolean status=mBluetoothGatt.writeCharacteristic(alertLevel);

I get value of status as true. Now the tag should beep. But that doesn't happen. Also when I perform the same operation via a 3rd party app in play store it does work. Can you kindly help me out with this issue? Thanks in advance

[Sree]

Even I am facing same issue did you found any solution.