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julian 4319fb86dc wiki: Dingtian relay decision, HTTP-over-MQTT, unmanned direction

- dingtian-relay: relay+input controller (4ch on hand). Inputs are decoupled
  from relays (configurable via input_link_relay) — solves the
  access-controller-button-flow blocker the UHPPOTE couldn't. Full protocol from
  the SDK (UDP string control :60001, `00` status parse, input_link_url push,
  multicast discovery). Driver + hardware test still to build.
- dingtian-vs-mqtt: use direct HTTP/UDP now; MQTT skipped (broker = extra infra
  + failure mode + overkill at one-host/few-devices scale) but kept for later
  multi-lane scale.
- autonomous-direction: record the roadmap to fully unmanned (no booth) and how
  it reshapes the threat model (operator-fraud -> unattended-machine threats),
  makes host-in-the-loop entry mandatory, and raises fail-state stakes.
- threat-model: note the unmanned shift. index + log.

gitignore the vendor SDK (dingtian/, 71MB of binaries/examples) — reference
only, protocol captured in the wiki.

2026-06-14 13:27:01 +02:00

4.7 KiB

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type, tags, updated

type

Index

Content catalog for the wiki. Start at overview. Maintained on every ingest. Counts: 1 source · 14 entities · 10 concepts · 2 decision records.

overview — the top-level synthesis and entry point.
index — this catalog.
log.md — chronological record of ingests/queries/lints.

Sources

parking-system-architecture — design notes: stack, threat model, devices, UHPPOTE, ESP32, readers, BOM, open decisions.

Entities — technology stack

technology-stack — the full stack table; all MIT/Apache/BSD, chosen to avoid lock-in.
fastify — Node backend; hosts device-driver plugins + auth; serves the SPA.
sqlite — local single-writer DB (WAL); limits & why it fits.
drizzle-orm — ORM; schemas port to PostgreSQL for remote sync.
turborepo — monorepo tool.
react-vite-spa — React/Vite frontend served by Fastify.
local-jwt-auth — fully local auth (JWT + bcrypt + role guard); forced by offline-first.

Entities — rejected alternatives

payload-cms — strong, but rejected over BSL license shift (the rug-pull cautionary case).
refine — dropped for plain React; UI too simple to justify a framework.
logto-zitadel-oidc — OIDC providers ruled out by offline-first.

Entities — hardware & devices

uhppote-controller — current access controller; cheap, tamper-evident, open-UDP, fixed firmware.
esp32-custom-controller — prevention-grade upgrade; device-level auth.
atecc608 — secure element; non-extractable signing key (host events + controller auth).
wiegand — reader standard feeding the controller directly (autonomous permit-holder path).
lpr-camera — edge-AI plate recognition; host-side casual-identity source.
zkteco-controller — C3/inBio controller; aux-input path may enable host-in-the-loop (driver TBD).
dingtian-relay — relay+input board; inputs decoupled from relays → solves the button blocker (driver TBD).
bom — reference bill of materials (barrier, loops, controller, readers, payment, host, network).

Concepts — foundational forces

offline-first — no network dependency in core operation; what it forces (and doesn't).
threat-model — the operator-at-the-booth reframing; why encryption defends the wrong threat.

Concepts — integrity & anti-fraud

append-only-event-chain — append-only + hash chain + ATECC608 signing = unforgeable log.
reconciliation — the real anti-fraud control; what remote sync actually is.
disk-os-hardening — LUKS/GRUB/Secure Boot; worthwhile but not the main event.

Concepts — device architecture & safety

device-adapter-pattern — business logic talks to interfaces; swap hardware → new adapter.
device-registry — catalog of selectable drivers per category (admin-configurable).
first-run-setup — admin assigns devices per lane from the catalog at install.
device-discovery — optional driver capability to scan the LAN (UHPPOTE UDP broadcast).
barrier-not-a-door — never timed-close a barrier; safety lives in barrier firmware.
trust-boundary — the core fork: network vs. device; auditable vs. unforgeable.
fail-state-safety — entry fails closed, exit fails open; manual override; watchdog.

Concepts — access control

uhppote-udp-protocol — open UDP weakness + the unauthenticated commands that undermine the log.
network-isolation — mandatory VLAN isolation; the network as security boundary.
event-log-ingestion — host-side index tracking that makes the UHPPOTE log trustworthy.
challenge-response-auth — asymmetric nonce scheme for the ESP32 (auth + anti-replay).
entry-exit-readers — two populations, two integration paths; both can share a relay.
uhppote-vs-esp32 — comparison: detection vs. prevention.

Dev environment (reference)

local-dev-workflow — running the stack locally; setup, the dev-hang gotchas, seed:admin.
wsl-dev-networking — WSL2 NAT blocks device broadcast; use mirrored mode + the gotchas after.

Decisions

standing-decisions — settled decisions (stack, platform, integrity, access control, readers).
open-questions — 7 open items (6 procurement + JWT key choice); ESP32 device auth deferred.
access-controller-button-flow — ⚠️ BLOCKER: UHPPOTE/ZKTeco on hand can't do ticket-first entry as wired.
autonomous-direction — roadmap: toward fully unmanned (no booth); reshapes threat model + fail-state.
dingtian-vs-mqtt — transport choice: direct HTTP/UDP now, MQTT parked until multi-lane scale.

4.7 KiB Raw Blame History