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State machine:
- Boot: check 5s reset-button hold → wipe NVS creds; load saved SSID/pass
- If no creds (or reset): enter_provisioning() — WiFi.softAP + DNS redirect + WebServer
- If creds: attempt_wifi(); on success → normal_operation(); on fail → enter_provisioning()
- normal_operation(): HTTPS GET /api/device/{mac}/image → stream to LittleFS → display;
204 = keep current stored image; 404 = red fill; server error = yellow fill;
deep sleep 15 min between polls
Provisioning flow:
- AP SSID: "PictureFrame-{last4hex}" broadcast as open network
- QR on e-ink: WIFI:S:PictureFrame-XXXX;T:nopass;; → phone auto-joins AP
- Captive portal: redirect all DNS to 192.168.4.1; serve minimal HTML form
(handles iOS /hotspot-detect.html and Android /generate_204 redirects)
- POST /connect: async — respond immediately, attempt WiFi in loop()
Success: save NVS, show Phase 2 setup QR (green bg) → 2min delay → normal_operation()
Failure: red fill → restart AP
EPD driver refactor:
- Extracted epd_init/sleep/fill/draw_qr/draw_image_from_file into epd.h + epd.cpp
- epd_draw_qr(): ricmoo/QRCode library; computes modules inline per pixel row
- epd_fill(): solid color in one pass (used for red=no-wifi, yellow=sync-fail)
- epd_draw_image_from_file(): streams LittleFS binary directly to display
Removed: convert_photo.py (pre-rendering moved to server-side Imagick), image.h (PROGMEM array)
Added: config.h, epd.h, epd.cpp; updated platformio.ini (QRCode lib, littlefs fs)
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>