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Buttonless BLE DFU with non-ble apps.

Hi, I am developing an IMU app communication with ESB.  I would like to send to the board a command with ESB to put the nrf52832 board in BLE DFU mode.  

I have look at the different methods for entering in DFU mode :

NRF_BL_DFU_ENTER_METHOD_BUTTON

NRF_BL_DFU_ENTER_METHOD_PINRESET

NRF_BL_DFU_ENTER_METHOD_GPREGRET

NRF_BL_DFU_ENTER_METHOD_BUTTONLESS

I understand the BLE buttonless DFU exemple with the method NRF_BL_DFU_ENTER_METHOD_GPREGRET but I but seems to depend on a lot of BLE and SDH related files.

Might be wrong but the  NRF_BL_DFU_ENTER_METHOD_BUTTONLESS seems the simplest but I could not finding any exemples of code to add in my program.

I have read all the DFU / SDK document and post related to this topic, without finding the answer.

Could you please point me in the wright direction.

Thanks 

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