nrf21540 using mpsl library that seems to not work with ncs/zephyr BLE stack

hello Nordic

i want to use nrf21540 dk  to run a simple Bluetooth / beacon example with the ncs (v 1.9.2) i do not see some rise in dbm power with the nrf connect android application (also rtt seems to be locked so logging is an issue as well, not sure what that problem is)

(my end goal is to test tx boost capabilities when connected to our own pcb based on nrf52840 soc, i had some problem with that on this thread:

devzone.nordicsemi.com/.../how-to-configure-and-work-with-nrf21540-with-a-pcb)

i tried to follow the code in the ncs and could not find the connection between the mpsl_fem module and the ncs/zephyr ble api

though in the example build i do see the CONFIG_MPSL=y which is not clear to me what dependency put it to 'y' and how it is used cause in the above thead putting it to 'y' cause a fail cause of semaphore is not released

any ideas, and also is it possible to work with ncs/zephyr BLE stack / api with the nrf21540 EK as a tx booster for other pcb

best regards

Ziv

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