Full live investigation of the persistent 503 "deviceBusy" on main-stream ISAPI
snapshots (10.0.10.13): ruled out config (byte-identical to a working sibling
model), ruled out firmware age (reproduced on both the original V5.8.11 and
current V5.11.0 builds, ~15 months apart), and ruled out real resource
contention (a full channel-ID sweep shows every ID fails identically except
the one hardcoded working value, including nonexistent channels) — pointing
at a broken/incomplete ISAPI snapshot handler that mislabels itself as
"busy," not a real encoder ceiling.
RTSP main-stream frame-grab was confirmed as a working route around it, but
given the bug and the sub-stream's real-world plate-read accuracy problems,
the owner decided to replace the DS-2CD1047G3H-LIU units rather than carry
an ffmpeg/RTSP dependency to work around vendor firmware. Ingested the
vendor datasheet as a source page along the way.
Claude-Session: https://claude.ai/code/session_01FWncR69HgGPuei1dLrW3cU
Ingest the predecessor SQL Server schema (raw + source summary) and file design
pages for time-of-day/seasonal tariff tiers and merchant validation/postpaid
sponsorship. Cross-link tariff.md and validation-discounts.md. No code.
The reader on hand is a GEE-QR-ER80 QR/DataMatrix/1D barcode access reader
(not an EM4100 prox-card reader as first guessed). Interfaces: Wiegand 26/34,
RS-232, RS-485, USB, TCP/IP; 4-15 VDC; Linux-supported. Variant on hand: -Q-W
(QR scanner, Wiegand/RS-232/485).
This is the QR-ticket scanner the design already needed: a host-side reader
whose scans become read-bus events consumed by the (already-built) exit flow
and QR-permit path. Prefer RS-232/485 over Wiegand (Wiegand can't carry a
variable-length QR string; autonomy is moot with the no-ACL Dingtian).
New source + entity pages; updated ticket-encoding, entry-exit-readers, index.
Open (blocks the adapter): the RS-232/485 frame + baud (ASCII CR/LF expected).
Turborepo (pnpm workspaces) with all dependencies pinned to latest
mutually-compatible versions: turbo 2.9, TypeScript 6, Fastify 5,
React 19, Vite 8, better-sqlite3 12 + Drizzle ORM 0.45.
Layout:
- apps/server Fastify backend (local JWT auth + role guard, /health)
- apps/web React 19 + Vite 8 operator SPA
- packages/db Drizzle schema on SQLite/WAL; append-only events + users
- packages/devices reader/printer/relay adapter interfaces (intent-only relay)
- packages/shared shared domain types
Architecture constraints from the design wiki are encoded in the scaffold:
append-only hash-chained + signed event log, device-agnostic adapters,
"a barrier is not a door" (relay expresses intent only), fully-local
offline-first auth.
wiki/ is an LLM-maintained Obsidian knowledge base (28 pages) ingested
from the architecture & design notes, with its own maintenance schema.
Verified: pnpm install, full turbo build (5/5), server boots and serves
/health, drizzle-kit generates the initial migration.
julian