Arduino for STM32

So I did a lot of digging around, found AN2606, and tried adding this to my code before the JumpToDFU:

__enable_irq();
HAL_Init();
__HAL_RCC_PWR_CLK_ENABLE();

HAL_FLASH_Unlock(); // Unlock the Flash memory for writing
HAL_FLASH_OB_Unlock(); // Unlock the Option Bytes

FLASH ...

I am working on a project that I'd like to be able to force into DFU mode through software. I know this can be done, because in the core product, ST Micro has a "Debug console" and if you type "DFU" into that console, the board enters DFU mode.

But I'm not having so much luck. I've tried the ...

Help, I'm completely stuck! I can't seem to get the STM32duinoBLE library to be useful on the sensortile box: it works but seems to only set up a basic BLE device with generic interface that can't be used to move data from or to the device, and adding services seems to be non-functional.

So to make ...