DATA FILE TRANSFER FROM SD CARD TO MOBILE USING USB PROTOCOL. HOW TO DO IT IN NRF52840

[jagannathan GOPALAKRISHNAN]

we are using NRF52840 , with a SD card.  Data is stored in SD card in Text file or .csv file every 10 mins.  We want to push the data to Mobile App either using the BLE or using the USB protocol.  Kindly advice .