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Project title:
Android Kiosk App for SUNMI K2
Posted by:
External project from PeoplePerHour
Started:
03-Oct-2025 10:14 GMT
Description:
Overview

Build a locked-down Android kiosk app for the SUNMI K2 (24", 1080×1920 portrait).
The app will pull content from our WooCommerce /kiosk endpoint, cache it for offline-first operation, and expose native capabilities—printer, QR/camera, USB vending controller—to the web UI via a secure JS bridge.
Payments are handled via Revolut Terminal API (semi-integrated): app initiates transactions, terminal performs PCI-scoped card flow, app receives results.

Deliverables

Production-ready APK/AAB + full source code (Git repo).

JS bridge documentation + sample /kiosk bundle.

Config guide (WooCommerce endpoints/keys, Revolut Terminal setup, supported USB VID/PIDs).

Simple USB vending serial protocol spec + (nice-to-have) bench simulator.

Test plan/results (unit, instrumented, hardware-in-the-loop) and admin cheat sheet.

Scope & Requirements

Content & Offline

Fetch /kiosk HTML/JSON/assets from WooCommerce; verify signatures; local cache.

Start from cache; background delta updates (WorkManager).

Render via WebView (file://) with a minimal, audited JS↔Native bridge.

Payments — Revolut Terminal (semi-integrated)

App sends {amount, currency, orderId} to Revolut Terminal API/device.

Handle async result (approved/declined/cancelled), update UI, print receipt, update WooCommerce order.

Idempotent flow with retries; refund/void via PIN-protected admin.

Peripherals

Printer: SUNMI SDK / ESC/POS (receipts, admin prints).

QR/Barcode: CameraX + ZXing/ML Kit; expose decoded payload to WebView.

Vending: USB CDC/serial to control up to 12 slots; commands, timeouts, retries, job queue.

(Optional) NFC: Read ISO14443/NDEF tokens for loyalty/account lookup.

Kiosk & Resilience

LockTask (pinned app), immersive full-screen, auto-start on boot.

Watchdog to recover WebView/service on crash/hang.

Branded offline page and graceful error states.

Security/Privacy

TLS + cert pinning to our APIs; signed content manifests.

Admin menu with PIN; logs export with PII redaction; GDPR-aware.

Telemetry

Local event queue → batch upload (crashes, payment outcomes, dispense results, playback metrics).

Acceptance Criteria (must pass)

Boots straight into kiosk; recovers from kill/reboot in ~5s; no system chrome.

Offline-first after initial sync.

Full flow: Revolut card payment → vending dispense → receipt print → WooCommerce order update.

100 consecutive purchase cycles without ANR/crash on SUNMI K2.

Signed bundle verification enforced; admin features behind PIN.

Tech Preferences

Kotlin + Jetpack (ViewModel, WorkManager, Room).

Android WebView with shouldInterceptRequest asset interception; addJavascriptInterface for a minimal bridge.

CameraX + ZXing/ML Kit; SUNMI SDK for printer/scanner where applicable.

USB Host (CDC/FTDI), OkHttp3 with TLS pinning, Hilt DI.

Crash/metrics (Crashlytics/Sentry); ProGuard/R8.

What We Provide

WooCommerce /kiosk endpoint + adverts and signing keys.

Revolut merchant sandbox credentials and terminal.

Test hardware access or remote test windows.

API contracts and sample UI bundles.

Experience Needed

Android kiosk/terminal apps in production.

Revolut Terminal or similar semi-integrated card workflows.

USB serial on Android + ESC/POS printing.

WooCommerce/REST integrations.

Nice-to-Haves

Prior SUNMI K2 integrations.

Hardware-in-the-loop testing experience.

Content signing/manifest verification patterns.

Screening Questions (answer briefly)

Outline your semi-integrated Revolut Terminal flow (init → async status → idempotent order update → receipt).

How will you design a safe JS↔Native bridge so WebView stays sandboxed but can print/scan/dispense/pay?

Your retry/timeout strategy for DISPENSE and payment callbacks.

How do you keep kiosk mode after crashes/reboots and ensure quick recovery?

Your approach to content signing and preventing activation of tampered bundles.

Budget & Timeline

Fixed-price: £____ (please propose)

Timeline: ____ weeks (milestones welcome)

Legal

NDA and IP assignment required.

Must provide code in a private Git repo throughout the project.
Project ID:
3452185
Project category:
Project budget:
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