common bootloader?

[Jeeves]

Hmmm the Bluetooth part might be challenging... My Mynewt OS port uses the open-source NimBLE stack (also available for Zephyr OS): https://github.com/apache/mynewt-nimble

Other ports may choose to use the proprietary Nordic SoftDevice stack. I wrote about NimBLE vs SoftDevice here: https://medium.com/swlh/sneak-peek-of-pi...38e99ec20d

Do you have any data about the object size the NimBLE stack compiles down to? Ideally, the bootloader would probably be less than 4KB so it fits in just the first page of the internal flash. I'd be only too delighted to use a pre-written bluetooth stack if it's small enough.