Buttonless DFU on nRF52832

[Tosa]

I'm using nRF52832 + SDK17.0.0 + s132_7.0.1. I am testing buttonless DFU on the PCA10040 board based on this blog, The initial DFU (when there is no app) is successful:

1. Build the secure_bootloader example with a private key.
2. Build the ble_app_buttonless_dfu example.
3. Create the DFU zip packet: "nrfutil pkg generate --hw-version 52 --application-version 0 --application nrf52832_xxaa.hex --sd-req 0xCB --key-file private.key app_dfu_package.zip"
4. Upload the secure_booloader and softdevice using nRFgo Studio.
5. Connect to DFUTARG with Android nRFConnect and DFU app_dfu_package.zip
6. I see NORDIC_BUTTONLESS advertise and can connect to it fine

When I try to DFU from NORDIC_BUTTONLESS, nRFConnect disconnects from it and connects to DFUTARG which opens automatically in a new tab and just idles. The NORDIC_BUTTONLESS tab says "connecting", but never connects. If I go back to the DFUTARG tab and click DFU, it just idles in the Initializing state. The issue seems similar to this, but I do not see a "known issue" issue in Bjorn's link. Please advise on how to get the DFU to work once an app is already uploaded.

[Aleksander Nowakowski]

Could you post here logs from nRF Connect on the DFUTARG tab?

The new tab that opens when you do dfu can be closed. nRF Connect just discovers new device connected and opens this tab automatically, but you should be using only the original tab if don't want to sniff dfu process.

[Tosa]

Which logs from nRF Connect are you referring to? nRF Connect isn't opening a new tab; it's just disconnecting from NORDIC_BUTTONLESS. I manually go to the scan tab to see and connect to DFUTARG.