Secure DFU mode enter procedure

[Akshat]

Hello,

I am using nRF5_SDK_12.0.0 with soft device s130_nrf51_2.0.1_softdevice. I am trying to implement the DFU service in my application, for which I am following: [https://infocenter.nordicsemi.com/index.jsp?topic=%2Fcom.nordic.infocenter.sdk5.v12.0.0%2Fble_sdk_app_dfu_bootloader.html] I have successful program soft device and bootloader (secure_dfu_secure_dfu_ble_s130_pca10028), after that for DFU process completed using nRF Toolbox App. In the DFU procedure, it is mention that "If a valid application is installed on the device, hold Button 4 during startup to prevent the bootloader from starting the application and force it to enter DFU mode instead." I just want to implement jump in the bootloader mode using UART messaging instead of holding Button 4. Can you please suggest me how can I implement it?

Thank you.

[Hung Bui]

@Akshat: You may want to have a look here at Appendix 1. Advanced features, Section 2 Buttonless DFU.