DFU: Failed to open transport backend

[George Phillip Orais]

Hi Everyone,

I'm working on adding DFU on my project and here is my setup:

• Softdevice = 7.1.0
• SDK = 6.1.0
• DFU Bootloader = Keil compiled from SDK 6.1.0
• MCP = 3.8.0.7
• nRFgo = 1.17.1

If the application is compiled with Keil, then OTA DFU works fine. But if i compile the application with GCC, then i got the message shown on the topic title.

My question is, is it possible to use a Keil compiled DFU bootloader together with a GCC compiled application? If yes, what are the necessary things to be considered?

I almost gone through all the related topics but i still cannot make it work, i'm running out of ideas already, i hope someone can help me point me on the right patch, thank you in advance.

BR, Geo

[George Phillip Orais]

I just remember, what i noticed is after successfully downloaded the gcc-compiled-app to the chip through OTA, i still can switch to DFU via DFU service. Then i can see the new advertised device name, which confirms its on bootloader now. But once i connect and discover the services, it will have a long wait on the last handle? I think it was handle 0x000F? It seems the MCP was not able to receive the expected reply from the device, any ideas? Did the gcc-compiled-app corrupted the bootloader? But the size of the app is not that big..