User report: iOS sees the captive network correctly (the captive UI
fires the moment any app makes an HTTP request), but won't auto-pop
it from a QR-scan join. This is recent-iOS hardening — Apple no
longer aggressively opens CNA on QR-initiated joins.
Workaround: a single QR can only encode one action, but two QRs
side-by-side close the loop —
STEP 1 — WiFi-join QR (WIFI:T:WPA;S:NAME;P:pass;;)
Phone joins PictureFrame.
STEP 2 — URL QR (http://192.168.4.1/)
Phone opens Safari → Safari hits 192.168.4.1 → that HTTP
request is the "any app" trigger that fires the captive
UI deterministically.
Implementation:
- WiFi QR shrinks from cell 5 (185 px) to cell 4 (148 px) to make
room for the URL QR below.
- URL QR is static, baked into ap_bg.bin via Python qrcode at gen
time — no firmware QR-render changes needed for it.
- epd_draw_ap_screen / _retry overlay coords updated to match the
new WiFi QR position (581, 100, 4).
- Left-panel step list now reads "1. Unlock / 2. Scan QR 1 / 3. Scan
QR 2 / 4. Enter password and tap Connect".
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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