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julian b2a0471b08 Rongta 80mm printer: driver, role-based failover, live status monitoring

Add the rongta PrinterDevice driver (ESC/POS over raw TCP 9100) and the
device-agnostic pieces around it:

- Roles + failover: each printer declares a role (entry-dispenser/booth-
  receipt) and failoverRank; printer-routing.ts picks the best healthy printer
  and falls back outside->booth for entry tickets (never the reverse).
- Live status: MonitorableDevice.readStatus()/PrinterStatus capability. The
  Rongta driver scrapes the device's own /prn_stat.htm (Cover/Cutter/Paper
  End/Near End/Off-Line) rather than hand-decoding DLE EOT, whose reply bytes
  on this clone don't match the canonical ESC/POS bit layout (verified on
  hardware) -- avoids a false-healthy. Maps to ready/degraded/offline, fail
  safe on an unreachable or unexpected page.
- Server PrinterMonitor polls enabled printers (PRINTER_POLL_MS, default 5s),
  caches latest, emits "printer-status" on change. Exposed via
  GET /api/printers/status and an SSE stream for the booth UI.

Verified against 10.0.10.6: ready when healthy, offline when unreachable
(no throw), bus emits on change and suppresses unchanged reads.

Wiki: new rongta-printer entity, printer-roles-failover and
printer-status-monitoring concepts; BOM/index/log updated.

2026-06-14 20:26:45 +02:00

5.2 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 · 15 entities · 12 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 — ❌ rejected/historical; firmware auto-open blocker drove the switch to Dingtian.
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 — ❌ rejected/historical; aux-input path was a contender, not pursued.
dingtian-relay — ✅ CHOSEN access controller; decoupled inputs solve the button blocker (driver verified on hardware).
rongta-printer — ✅ CHOSEN 80mm thermal printer; ESC/POS over raw TCP 9100; driver written, one unit reachable at 10.0.10.6.
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-input-flow — button → device push → backend decides → relay; backend is source of truth.
device-discovery — optional driver capability to scan the LAN (no current driver uses it; UHPPOTE was the example).
barrier-not-a-door — never timed-close a barrier; safety lives in barrier firmware.
printer-roles-failover — ≥2 printers per lane by role; entry ticket falls back outside→booth.
printer-status-monitoring — live poll of paper/cover/cutter/offline via the device's status page; SSE to the booth UI.
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 — ✅ RESOLVED: Dingtian decoupled inputs enable ticket-first entry (was a UHPPOTE/ZKTeco blocker).
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.

5.2 KiB Raw Blame History