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Need help to understand how to use FATFS with BLE

Hello,

I have a problem statement in which I have to generate a file for data that is received from UART communication and want to send it to the mobile application whenever the application connects to the device through BLE. 

So can anybody tell me which BLE service should I use? What are the file formats are there that are supported? How to use encryption similar to DFU OTA example code uses?