nRF Toolbox couldn't do OTA using Bluetooth 5

[Alice]

Hi

We are using the nRF52840 and the application is OK now. Then I do the OTA using a Android phone which supports Bluetooth 5 and it's made in our country. I use the nRF Connect to connect the device and make it switch to the bootloader mode, at this time the device is advertising as DfuTarg. Then I use the DFU in the nRF Toolbox to connect it and then select the UPLOAD. But it indicates Uploading all the time then fail. Anyone could hele me have look? Thanks.

When the device is advertising as DfuTarg, I could use nRF Toolbox for IOS to do OTA. The nRF Toolbox for Android is download from github.com/.../Android-nRF-Toolbox

Blue5_NoFlash_0720.zip

Blue5_NoFlash_APP_SD_BL_0720.hex

[Hung Bui]

@Alice: Could you state which phone you used to test ?
Could you find the log when doing DFU ? A sniffer trace would be useful, but you need a sniffer that support Bluetooth 5.0

[Alice]

The phone is nubia Z17, what a pity, we donn't have such a sniffer . Does the nRF Toolbox support bluetooth 5?

[Hung Bui]

I don't think it's the issue with the nRFToolbox app. The app should work doesn't matter if it's Bluetooth 5 or not. It works on my Galaxy S8 which supports Bluetooth5.0

It could be something else, please enable logging (RTT log) on the NRF52 and send the log to me. Also please find the log on Android when doing DFU.

[Alice]

Hi Hung,

I have test the DFU for nRFToolbox app on IOS.Use nRF Connect app to Write 0x01 to the DFU characterstis then the device would switch bootloader mode and advertise as DfuTarg. nRFToolbox app on IOS could connect to it and then finish OTA successfully. However, nRFToolbox app on Android couldn't connect to it even though the device advertise as DfuTarg. App indicates uploading all the time and then fail. I meet the same issue when I test the experimental_ble_app_buttonless_dfu example in SDK. I have upload the attachment I use.

[Hung Bui]

Hi Alice,

When testing here I can see that the bootloader crashed when connected to the phone after switching from application to bootloader.

Have you modified the bootloader ?Have you tried to test with just the bootloader (no application ) ?

Please try to test with the bootloader example with no modification (except for the key) and no application, flash softdevice and bootloader and then try to update the application.