Download this BCM94343W_AVN.zip file to your ...\WICED-Studio-5.x\43xxx_Wi-Fi\platforms folder
Unzip this file there to create the missing BCM94343W_AVN subfolder.
Note that these v5.x platform files are not suitable for use with earlier versions of WICED SDK
The following must be added into the application .mk file in order for the BLE PowerSave function to work correctly!!! (eg. ble_hello_sensor.mk in WICED Studio 5.x)
#ENABLE_APP_POWERSAVE macro is also enabled for BCM94343_AVN platform (Avnet BCM4343W IoT Starter Kit)
ifeq ($(PLATFORM), BCM94343W_AVN)
ENABLE_APP_POWERSAVE := 1
GLOBAL_DEFINES += ENABLE_APP_POWERSAVE
#$(error $(ENABLE_APP_POWERSAVE))
endif