Can you link the appropriate document? I have looked through the datasheet, the reference manual, documentation for the STM32WB Cube firmware package, application notes and neither of the documents describes the LLD APIs for the 802.15.4 MAC layer, o...

WOW! That is so disappointing. On all of the device summary and advertisement brochures/flyers you loudly say "And Proprietary 2.4GHz" in addition to the BLE, Thread and 802.15.4. You should remove that information to not mislead users, or better to ...