BLE response not working

[ghost]

I am able to write and read BLE request and response via NRF BLE app for an embedded device. But while using this library for the same purpose, I am only able to send successful request but the indication is not working.
Pls Note: The scanner function and send function(for write) works fine and I have decided proper UUID as well as read write characteristic in the code as well as cross verified in the mobile app.