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P3.W2 (firmware half): waste bin-node reference firmware - #24
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ESP32/PlatformIO implementation of the full platform envelope (docs/TELEMETRY.md), compiled to a real image (verified locally and now in CI with a cached toolchain): - Ed25519 identity generated on first boot, held in NVS; one-time-code enrollment against /devices/enroll - median-of-5 ultrasonic fill sampling with per-bin EMPTY/FULL calibration, clamped to 0-100% - canonical-JSON signing with JSON.stringify-compatible number formatting (2dp, trailing zeros stripped) — the signature-breaking sharp edge, documented in the firmware README - strictly monotonic seq in NVS; store-and-forward buffer in RTC memory across deep sleep; 409-after-lost-ack treated as accepted - BENCH_MODE (WiFi + NTP, 30s cycle) for desk testing against the compose stack; field builds hit a deliberate #error at the marked TinyGSM cellular swap point so the bench transport cannot ship - battery/tilt/temp left as marked hooks for the chosen board Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Roadmap item
P3.W2, firmware half — the per-bin node that replaces the shared-gateway framing of P2.7 for this vertical. Compiles to a real ESP32 image (verified locally via PlatformIO in a sandboxed toolchain — 73 % flash, 14.5 % RAM — and now in CI with a cached toolchain).
What it implements
JSON.stringify-compatible number formatting (the sharp edge that would silently break signatures, documented), strictly monotonicseq, store-and-forward in RTC memory across deep sleep, and 409-after-lost-ack correctly treated as 'batch accepted'.#errorat the cellular swap point (TinyGSM/SIM70xx documented) so a bench transport can't silently ship to the field.Remaining for M4
Hardware procurement (runbook BOM), board-specific battery/tilt/temp hooks, install, 30-day run.
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