merge ble_dfu and serial_dfu on SDK14.2.0

[Aijiapeng]

Dear Nordic Team:

       I used nrf52832 as my BLE IC, and an IC of Novatek as my MCU. They are connected by uart.Now I need to merge ble_dfu and serial_dfu on the version of SDK14.2.0.I've tested ble_dfu and serial_dfu separately before, and everything went well.But when I combined them together, the ble_dfu was still normal, but the serial_dfu exception.I found that the combined BootLoader reset after receiving the create object 0x01, nrf_fstorage_write 1024bytes.(to be sure, the packet passed by Novatek MCU has no problem, because I tested serial_dfu alone).And i also change the "#define NRF_FSTORAGE_SD_MAX_WRITE_SIZE 4096". By the way , I added serial_dfu to the ble_dfu project. I don't know the reason. Please help.

Thanks in advance !

[Aijiapeng]

Hi,Dear all . I reduced the baud rate from 115200 to 9600, and ensured that the MCU waited for the response of nrf52832 after 4096bytes were sent each time, which is now normal.