PA+LNA support on NRF52?

I am trying to use Espruino on a NRF21540-DK board (NRF52840+nRF21540 Front End Module, FEM). The latter can be either in TX or RX mode but not both at the same time. It means that the BLE stack should manage the FEM state pins accordingly. Is there anything already built-in to do so?

by the way, the idea behind using such an FEM module is to increase range to cover outdoor applications as well. More and more systems and sensors use BLE advertising to publish data and having the possibility to support the FEM would drastically help outdoor applications for environmental sensors or beacon tracking

I haven't come across this before I'm afraid - but it feels like maybe something that would be handled by the softdevice (as it's going to have to have very fine-grained control).

If it's in the softdevice then modifying Espruino to enable it is probably pretty trivial

seems there is already something available, however I am not able to follow it up to the user space
https://github.com/espruino/Espruino/blo­b/55fbab3847975a40341dd2272d4693b341cc0f­fe/targetlibs/nrf5x_12/components/softde­vice/s130/headers/ble.h#L109

there is more here https://github.com/espruino/Espruino/blo­b/55fbab3847975a40341dd2272d4693b341cc0f­fe/targetlibs/nrf5x_12/components/softde­vice/s130/headers/ble.h#L212-L295

so when filled properly it should be configured in similar way to this https://github.com/espruino/Espruino/blo­b/55fbab3847975a40341dd2272d4693b341cc0f­fe/targets/nrf5x/bluetooth.c#L2567C5-L25­75C6

Thank you both for your quick replies.

So it seems that anyhow, a specific compilation has to be done with edited bluetooth.c file.

I naively thought that this could be solved directly in javascript, but it seems to be more complex.