A freshly-claimed device on a noon-daily schedule would otherwise sit
dark for up to 24 h after WiFi setup waiting for its first image. The
schedule kicks in only AFTER an image has actually been displayed.
Mechanism: at the bottom of normal_operation_impl, re-read NVS_KEY_IMG_ID
to see whether any successful 200-with-integrity-OK persisted an image
id this cycle (or any prior). If still -1, override sleepMs to
FIRST_IMAGE_POLL_INTERVAL_MS (15 s) — bypassing the schedule and the
clamp range, since SLEEP_CLAMP_MIN_MS is about runaway protection in
steady state and the bootstrap window is naturally bounded by "first
image arrives."
Tests:
- FW-FIRST-IMG-A: 204 with no img_id in NVS → 15s override fires
even when server says 6 hours.
- FW-FIRST-IMG-B: img_id pre-set, 200 cycle → server interval honored
(override doesn't trap the device in 15s forever).
- FW-FIRST-IMG-C: first 200 ever (img_id was -1, now persisted) →
server interval applies starting THIS cycle, no extra 15s nap.
Also patched FW-03 (304 sleep timing) to pre-set img_id so the test
exercises what it claims; 304 in production only happens when the
device already holds the image, so the override would never fire there.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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