Wire Printer

“Point. Scan. Walk away with a printed number.”

A single-screen industrial app that runs on one Android phone and one USB thermal printer.

What it does

The operator only needs to hold the phone camera over a shipping label. Without tapping the screen, a 4-digit identifier is printed the moment the barcode is recognized.

Core features

Live auto-scan

Rust masuri crate bound via uniffi. ~25× NEON acceleration (197ms → 8ms @ 640×480). Numeric labels only — alphanumeric codes are ignored.

Direct USB thermal printer connection

Xprinter XP-DT427B (VID 0x2D37, PID 0x400A). TSPL2 raster, 203 DPI. 80×50mm label: 4-digit identifier + date + year.

Duplicate-prevention ledger

SQLite-keyed by printed_date = today. Same number, same day re-scan is blocked. Auto rollover at midnight.

CONFIGURATION screen

Today's count and lifetime count. CLEAR TODAY requires an 800ms long press to prevent accidents.

Force re-print

Long-pressing the PRINT area bypasses the ledger block.

Industrial-grade UI

Single screen. No RoundedCornerShape, no Material elevation. Glyph icons only. The 4-digit hero on the label is the largest element — readable from across the bench.

Hardware requirements

·Android phone — Samsung Galaxy S22 or equivalent (minSdk 24, arm64-v8a)
·Printer — Xprinter XP-DT427B (currently supported)
·Thermal labels — 80×50mm, 2mm gap

Operational flow — 4 steps

01Connect the Android phone to the Xprinter XP-DT427B with a USB-C cable.
02Launch the app and hold the camera over the shipping label.
03A 4-digit identifier is printed automatically on barcode recognition.
04Re-scanning the same number on the same day is blocked.

Common situations

·OFFLINE indicator: re-check USB cable, printer power and label stock; force-restart the app if it persists.
·Scan fails: clean the lens, keep the camera 15–25cm from the label.