If `west build -- -DEXTRA_CONF_FILE=...` is forcing a pristine rebuild every time, you're paying for it. Here's a step-by-step how-to for using West overlays correctly, plus the new conveniences in Zephyr Tools that make it disappear.
After three iterations and a lot of false starts, I'm finally happy enough with my IoT server to talk about it. Meet Lion: a self-hostable backend for Zephyr devices, with some opinions about how device shadows, OTA, and log streaming should work.
Debugging your nRF9151 Feather has never been smoother: install the debugger extension, configure your launch settings, flash your code, and dive right into debugging within VS Code.