BLE notification never received on Android 4.4

I am developing an application in android to communicate with Blugiga BLE 112. Here my BLE device is meant to provide data to android as Readings , I can write a characteristic successfully but I am not getting any <strong> indicators on Android. Below I tried to set a notification.

public void setCharectresticNotification(
        BluetoothGattCharacteristic characteristic,
        BluetoothGattDescriptor descriptor) {
    mBluetoothGatt.setCharacteristicNotification(characteristic, true);
        descriptor
                .setValue(BluetoothGattDescriptor.ENABLE_INDICATION_VALUE);

        mBluetoothGatt.writeDescriptor(descriptor);


}

      

I call this method when I get the characteristic and handle successfully.

Also please specify the flow that I have to follow in order to set the notification after the connection is established.

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