Adds the WiFi-to-app sync path and the on-device open REST API implementing the
device paths of api/openapi.yaml, plus persistent config in NVS.
What changed:
- firmware/src/config.{h,cpp}: NVS (Preferences) store - stable device id from MAC,
WiFi SSID/PSK, API bearer token, upload settings. Secrets stay off the SD card.
- firmware/src/net_wifi.{h,cpp}: station join with stored creds; SoftAP provisioning
fallback when no creds / join fails; mDNS openscribe.local; reconnect in loop().
- firmware/src/api_http.{h,cpp}: synchronous WebServer on :80. Routes: GET /device,
GET/PUT /device/config, GET /recordings, GET /recordings/{id}, GET
/recordings/{id}/audio (HTTP Range -> 206 + Content-Range), DELETE /recordings/{id},
POST /record/start|stop. Bearer-token auth on mutating calls (open when no token).
- firmware/src/storage.{h,cpp}: list/read/delete/count helpers + path builders.
- firmware/src/main.cpp: wire config + WiFi + API into setup/loop; bump fw to 0.2.0.
- firmware/platformio.ini: add bblanchon/ArduinoJson@^7 (only new dep).
- state/: ARCHITECTURE, NOTES, TODO updated; security + NTP follow-ups recorded.
Why:
- This is the WiFi transfer channel and the device half of the "completely open API":
clients can list, download (resumable), delete and control without any cloud.
Notes:
- Not compiled locally (no PlatformIO on the dev host) or hardware-verified; CI builds
both board profiles. Security follow-ups logged: API is open when no token is set,
and the SoftAP uses a fixed default passphrase (make user-set at M4/BLE).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Implements the first working feature: the device records audio to the microSD
card, toggled by the button, with LED status and per-recording JSON metadata.
What changed:
- firmware/src/audio.{h,cpp}: mic capture via the core-bundled ESP_I2S. Dev board
uses I2S standard mode (INMP441/ICS-43434); XIAO uses PDM mode (onboard mic).
Presents 16-bit PCM mono to callers regardless of board.
- firmware/src/storage.{h,cpp}: microSD on a dedicated HSPI bus + a streaming
WavWriter that writes a 44-byte PCM header and patches RIFF/data sizes on close;
plus sidecar JSON metadata writer.
- firmware/src/recorder.{h,cpp}: idle/recording state machine; creates
/recordings/<id>.wav, pumps mic chunks in on update(), finalises + writes
<id>.json (Recording schema from api/openapi.yaml) on stop.
- firmware/src/ux.{h,cpp}: debounced button (short press toggles) + status LED
patterns (idle/recording/error), active-low aware.
- firmware/src/main.cpp: wires ux + recorder; loop toggles on button and drains
the mic while recording.
- firmware/include/audio_config.h: 16 kHz mono 16-bit, chunk size, rec dir.
- firmware/include/pins.h: added XIAO PDM mic + onboard SD pins, LED active-low flag.
- state/: TODO, ARCHITECTURE, NOTES updated for M1 and the deferred follow-ups.
Why:
- Recording is the foundation every later milestone (transfer, upload, transcription)
builds on. Kept dependency-free (only core-bundled ESP_I2S + SD) for simple CI builds.
Notes:
- Not compiled locally (no PlatformIO on the dev host) or hardware-verified; Forgejo
Actions CI builds both board profiles. Follow-ups tracked in state/TODO.md:
INMP441 16-bit level calibration, and real NTP timestamps (ids are uptime-based
until M2 brings WiFi/NTP).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
