52840 background to upgrade with ble combine uart

[shark]

hi

   I use nrf52840 with SDK17.1.

1.How to DFU via ble combined uart in the same application?I have sdudied a few of tickets ,example https://devzone.nordicsemi.com/f/nordic-q-a/72015/official-ble-and-uart-combined-dfu-bootloader, but I still confused.

2.I want background to upgrade mode via ble combine uart.How can I do?

  sincerely yours!

[Hung Bui]

Hi Li, 

1. What kind of issue you have when you combine the two transport ? 

2. We don't have an official example for background DFU. It's possible to do so though. Please have a look at this.