DFU service + BLE UART example

[KellyJust]

Hi,

I am trying to integrate the DFU service into the ble_app_uart example. I am using NRF51822 with SDK 11. I was able to successfully run the ble_app_hrs with dfu. So, I have pretty much copied all the DFU related content from the hrs example to uart example. But the device wasn't advertising and also not reaching the main function. After looking online I found this devzone

I changed the uuid count to 2 and now the dfu works with the example. But in case the dfu is not successful the nrf51 is stuck in the dfu mode for a minute or so and then gets back to the main application where as for the ble_app_hrs example for a failed dfu attempt the application is up and running pretty instantaneously. Not sure what the issue is here.

[Vidar Berg]

Hi,

The application should not have any impact on the DFU process inside the bootloader. Maybe the reasons for the unsuccessful DFU were different, and that is why you're seeing the different behavior? The bootloader will for instance time out and reset after 60 seconds if the controller is disconnected:  Idle mode procedure.The controller may also send the "system reset"  command to abort DFU.