# pricegod-urovo-daemon

The **Windows** counterpart to the Mac `rfid-daemon`. Instead of a Chafon gun writing a
loose chip while a Dymo prints a separate sticker, this drives the **Urovo D812R+ (RFID)**
to **print the label AND encode the UHF chip in one pass** on the composite (paper+chip) rolls.

It listens on `http://localhost:7790/` with `CORS *`, so it's a drop-in for the PriceGod
extension's existing `daemon.js` client — same port, same JSON shape.

## Run it
Double-click **`start-daemon.cmd`** (leave the window open while you work). That's it —
no Node, no .NET SDK, no gitea clone. It's a self-contained `.exe`.

To rebuild after editing `daemon.cs`: double-click **`build.cmd`**.

## What's inside
- `daemon.cs` — the service (C#, .NET Framework 4.x).
- `pricegod-urovo-daemon.exe` — the compiled daemon.
- `GTSPL_SDK.dll`, `GTSPL_SDK_C.dll`, `zlib.net.dll` — the Gainscha/Urovo print SDK
  (must sit beside the .exe). Copied from the vendor Windows SDK.

The print/encode sequence is a straight port of the proven `gtcheck.cs` `rfidgo` path:
`SET RIBBON OFF` → continuous geometry (`GAP 0`, RFID rolls blind the optical gap sensor)
→ `writeUHF` → draw text + QR → `printlabel` → read-back verify.

## Routes
| method | path | body | returns |
|---|---|---|---|
| GET  | `/status`       | — | `{ok, ready, status, statusText, printer}` |
| POST | `/print-encode` | `{sku, releaseId, artist?, title?, price?, condition?, w?, h?, gap?}` | `{ok, sku, releaseId, epc, verified, status}` |
| POST | `/write-tag`    | alias of `/print-encode` (the daemon.js name) | same |
| GET  | `/read-tag`     | — | `{ok, epc, sku, releaseId, recognized}` |
| POST | `/calibrate`    | — | RFID auto-calibration |
| POST | `/recover`      | — | ribbon-off + one feed to clear a fault |

Quick test (PowerShell):
```powershell
Invoke-RestMethod http://localhost:7790/status
```

## SKU ↔ EPC scheme (⚠ verify)
The 96-bit EPC (12 bytes) is packed as: **6 bytes** 14-digit timestamp SKU · **4 bytes**
release_id · **2 bytes** `0xEC01` marker. This lives in the `Epc` class in `daemon.cs` and
is the **only** thing that needs to change if it must match a different (Mac/Chafon) layout —
nothing else depends on the byte order. Confirm by reading an existing tag: put a
Chafon-written record at the antenna and `GET /read-tag`.

## Notes / open items
- Default label geometry is `65×37 mm`, continuous (`GAP 0`). Adjust to your actual RFID
  roll via the `w`/`h`/`gap` fields, or change the `DEF_*` constants.
- The label layout (text lines + QR) is functional, not yet pixel-matched to the 51×19
  Dymo design in the extension's `labels.js`.
- The Chafon gun is still needed for **reading a loose tag off a shelf** — the Urovo can
  only read/write a tag physically inside the printer.