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docs(wiki): printer USB transport + open-question for the provisioning

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New concepts/printer-usb-transport.md (the seam, usblp char device,
reachability-only status, threat model). open-questions #14: confirm the
on-site printer is USB and bake the usblp + udev write-access rule into the
appliance image (provisioning, not app code; unverified on hardware). Updated
rongta-printer.md (USB transport note), index.md, log.md.

Claude-Session: https://claude.ai/code/session_01Xcm6ikLgGoCxxHrxtjkk5V
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Julian Çuni
2026-06-24 20:32:24 +02:00
parent 793b8d83ee
commit 6d7682ab4a
5 changed files with 130 additions and 1 deletions
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wiki/index.md
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@@ -44,7 +44,7 @@ Counts: 4 sources · 19 entities · 45 concepts · 7 decision records.
- [[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); spare relays drive aux outputs (`setAux`).
- [[hikvision-radar]] — vehicle-presence radar on a Dingtian input; the entry presence gate (per-input active-level caveat).
- [[rongta-printer]] — ✅ CHOSEN 80mm thermal printer; ESC/POS over raw TCP 9100; driver written, one unit reachable at 10.0.10.6.
- [[rongta-printer]] — ✅ CHOSEN 80mm thermal printer; ESC/POS over raw TCP 9100 (or local USB, see [[printer-usb-transport]]); 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
@@ -66,6 +66,7 @@ Counts: 4 sources · 19 entities · 45 concepts · 7 decision records.
- [[barrier-not-a-door]] — never timed-close a barrier; safety lives in barrier firmware.
- [[printer-roles-failover]] — ≥2 printers 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.
- [[printer-usb-transport]] — ESC/POS drivers drive TCP (9100) OR local USB (/dev/usb/lp0) behind one render layer; USB = usblp char device, reachability-only status; provisioning open (oq#14).
- [[device-status-monitoring]] — unified live status across ALL device categories (healthCheck + printer readStatus) → the booth footer over /api/ws.
- [[trust-boundary]] — the core fork: network vs. device; auditable vs. unforgeable.
- [[fail-state-safety]] — entry fails closed, exit fails open; manual override; watchdog.