cannot build zephyr bluetooth tests in nrf-sdk

[pquevedo]

Following the installation guide for the latest nrf-connect sdk (v2.5.2) I am unable to run the zephyr bsim unit tests for the bluetooth mesh stack

#!/bin/bash
export BSIM_OUT_PATH=$HOME/dev/nrf-connect-sdk/tools/bsim/
export BSIM_COMPONENTS_PATH=${BSIM_OUT_PATH}/components

export WORK_DIR=${ZEPHYR_BASE}/bsim_out
export RESULTS_FILE=${ZEPHYR_BASE}/myresults.xml
export SEARCH_PATH=${ZEPHYR_BASE}/tests/bsim/bluetooth/mesh

${ZEPHYR_BASE}/tests/bsim/bluetooth/mesh/compile.sh

I am following the Readme on how to run these tests

- github.com/.../README.md

I have built and installed babblesim and set the correct paths. It fails with a linking error.

/usr/bin/ld.bfd: cannot find -lSOFTDEVICE_CONTROLLER_LIB_DIR-NOTFOUND/libsoftdevice_controller_multirole.a: No such file or directory
/usr/bin/ld.bfd: cannot find -lMPSL_LIB_DIR-NOTFOUND/libmpsl.a: No such file or directory
collect2: error: ld returned 1 exit status
ninja: build stopped: subcommand failed.

If I do the same thing from the standard zephyr repo (v3.5) it works without issue. So I don't think its something with my setup? 

[pquevedo]

Found out via discord that you have to explicitly define `CONFIG_BT_LL_SW_SPLIT=y` in the file `zephyr/tests/bsim/bluetooth/mesh/prj.conf` to get this to work. Appears nrf-sdk defaults to the nordic softdevice and you to have to override it or something...

Also this: devzone.nordicsemi.com/.../using-babblesim-with-softdevice-controller