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Re:Updating STM32 Over-The-Air using ESP32 by naraic0o on Monday May 25, 2020 @03:40PM (#23304171)
try gadgetbridge, it's an OSS project that already does this for cheap fitness trackers and some watches.

https://gadgetbridge.org/

Re:Updating STM32 Over-The-Air using ESP32 by mosselman on Tuesday May 26, 2020 @08:35AM (#23310305)
Wow this is amazing! It is exactly what I was looking for except for it being on Android only, but at least I now have a whole code base to learn from. Thanks!