Datasheet

If you are using the Adafruit nRF52 Pro Feather this should be:
3. Set the build_profile Field
Finally set the build profile for the new target ( debug or optimized ):
4. Test the Target Settings
You can review the target settings via the following command:
Final Project Structure
The final project structure should look like this:
Build and Flash the Target
Finally, you can build your target, pointing to the new application, and using the specified target BSP and build profile:
$ newt target set first bsp=@apache-mynewt-core/hw/bsp/ada_feather_nrf52
Target targets/first successfully set target.bsp to @apache-mynewt-core/hw/bsp/ada_feather_nrf52
$ newt target set first build_profile=debug
Target targets/first successfully set target.build_profile to debug
'my_blinky_sim' is an artifact of the default project creation process and can be ignored
$ newt target show first
targets/first
app=apps/first
bsp=@apache-mynewt-core/hw/bsp/ada_feather_nrf52
build_profile=debug
targets/my_blinky_sim
app=apps/blinky
bsp=@apache-mynewt-core/hw/bsp/native
build_profile=debug
apps/first
├── LICENSE
├── NOTICE
├── README.md
├── apps
│ └── blinky
│ ├── pkg.yml
│ └── src
└── main.c
├── pkg.yml
├── project.yml
├── src
│ └── main.c
└── syscfg.yml
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