I am using sdk11 and nrf51422 device with s130 softdevice for ble_multilink_lesc example code. How do I add DFU service in the existing code? I have added DFU service for other peripheral examples. But here when I follow the same procedure, the device is not at all advertising(not seen in nrf connect mobile app).
If it is not advertising, there is most likely an error reported, causing the device to reset. Have you tried following this debug-procedure to read out the error code, or see where the application crashes?