julian
b2a0471b08
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.
49 lines
2.5 KiB
Markdown
49 lines
2.5 KiB
Markdown
---
|
|
type: entity
|
|
tags: [parking, hardware, printer, device]
|
|
sources: []
|
|
updated: 2026-06-14
|
|
---
|
|
|
|
# Rongta 80mm thermal printer
|
|
|
|
The chosen ticket/receipt printer: a **Rongta RP-series 80mm network thermal printer** (and the
|
|
many ESC/POS-compatible OEM clones that share its firmware). Driver `rongta` in
|
|
`packages/devices` implements [[device-adapter-pattern|PrinterDevice]].
|
|
|
|
## Transport & protocol
|
|
|
|
- **ESC/POS over a raw TCP socket on port 9100** (the JetDirect/RAW convention). The driver
|
|
opens the socket, writes the ESC/POS byte stream, waits for flush, closes.
|
|
- **No authentication** on the print socket — anyone who can reach port 9100 can print. Like
|
|
every other field device it must sit on the **isolated device VLAN** ([[network-isolation]]).
|
|
There is no real HTTP/control boundary on the device (same posture as [[dingtian-relay]]).
|
|
- **Health check** is a TCP connect probe to 9100. The print socket exposes no status protocol
|
|
we rely on; the print itself is the real reachability test (failover attempts the print).
|
|
- **Live status** comes from the device's own web page `http://<host>/prn_stat.htm` (port 80),
|
|
which decodes Cover Open / Cutter Error / Paper End / Paper Near End / Off-Line into Yes/No.
|
|
We scrape that rather than hand-decode `DLE EOT` — this clone's DLE EOT reply bytes do **not**
|
|
match the canonical ESC/POS bit layout (verified on hardware), so trusting the device's own
|
|
decode avoids a false-healthy. Implemented as `readStatus()`; see [[printer-status-monitoring]].
|
|
|
|
## Deployment (this site)
|
|
|
|
- First printer verified reachable at **10.0.10.6:9100** from the host (TCP connect OK,
|
|
2026-06-14).
|
|
- **At least two printers**, by role — see [[printer-roles-failover]]:
|
|
- **entry-dispenser** — outside, at the lane; the driver takes the entry ticket.
|
|
- **booth-receipt** — inside the booth; receipts, AND the backup that prints the entry
|
|
ticket if the outside dispenser is offline.
|
|
|
|
## Ticket rendering
|
|
|
|
`printTicket(TicketData)` builds ESC/POS: `ESC @` init, centered/bold/double-size header,
|
|
lane, ticket id, issued-at, feed + partial cut (`GS V B`). CP437/ASCII subset.
|
|
|
|
## Status
|
|
|
|
Driver written and compiles; entry-ticket layout is a first pass; live status monitoring is
|
|
implemented and verified ([[printer-status-monitoring]]). The receipt/exit layout and the
|
|
cash-drawer kick (ESC/POS `ESC p`) are **not yet implemented** — they arrive with the
|
|
exit/payment flow. Replaces the generic "Epson TM / Citizen" booth-printer line in [[bom]].
|