On the nrf connect sdk documentation page there are instructions for configuring a radio co-processor:
http://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/nrf/ug_thread_tools.html?highlight=srp
For the nrf52840dongle the build command is:
west build -p always -b nrf52840dongle_nrf52840 nrf/samples/openthread/coprocessor/ -- -DOVERLAY_CONFIG="overlay-rcp.conf ../cli/overlay-thread_1_2.conf overlay-usb.conf" -DDTC_OVERLAY_FILE="usb.overlay"
The command fails with the error
cc1: fatal error: usb.overlay: No such file or directory
I can't find the file usb.overlay file anywhere in the ncs directory.
Please provide the contents of the usb.overlay file.
Thanks,
Jan Erik