How to transfer data through ble and get acknowledgment from the receiver (Mobile APP) using BLE - Chat example?

[RJOY.1]

I am using bluenrg2 ble- chat example.my requirement is to transfer data through ble and receive back a response data.Is it is possible using BLE-chat example? BLE received data from the mobile app.To transmit data from ble to the APP,what are the changes I have to made?Please help