Case Study
Mobile
PrintBill – WiFi POS Billing & Receipt Printing Application
PrintBill is a focused, cross-platform Point of Sale (POS) billing application built with Flutter. It enables store operators to browse products, manage a shopping cart, and print thermal receipts wirelessly via a network-connected ESC/POS printer all from a single mobile or tablet device. The application follows a clean MVC-style architecture using GetX for state management […]
Flutter GetXESC/POS Protocol over TCP/IPDart Raw Socket
mobile
networking
Our Services
What We Build
Key Features
01
Product Catalog :
- Overview : Grid-based product browsing with category labels and pricing
- Products : Tea, Coffee, Samosa, Sandwich, Cold Drink, Burger, Pizza Slice, Water Bottle, Ice Cream, Chips
- Interaction : Tap any product card to instantly add it to the cart with a success toast
02
Cart Management :
- Overview : Complete shopping cart with real-time reactive UI using GetX observables
- Controls : Increase/decrease quantity per item, remove individual items with confirmation dialog, clear all items
- Display : Per-item subtotal, total item count badge on app bar, and grand total summary panel
03
WiFi Printer Connection :
- Overview : Dedicated screen to configure and connect to a network thermal printer
- Input : Manual IP address entry with real-time updates to the controller state
- Auto-scan : Subnet scanning (port 9100) via WifiPrinterScanner to automatically discover printers
- Feedback : Connection status indicator in the navigation drawer (green/red dot with IP label)
- Tips Panel : Built-in guidance card explaining network setup requirements
04
Thermal Receipt Printing :
- Overview : Fully formatted ESC/POS receipt sent to a connected network printer
- Content : Store header (“Codex Lancers”), address, phone, order number, date/time, cashier name, itemized list with quantities and subtotals, grand total, cash tendered, change, barcode (Code128), and thank-you footer
- Paper : 80mm roll with auto-cut after printing
- Guard : If no printer is connected, a dialog prompts navigation to printer settings before printing
05
Network Printer Scanner :
- Overview : Background TCP socket scanner that sweeps all 254 IP addresses of a given subnet
- Implementation : Iterates from .1 to .254 and attempts Socket.connect on port 9100 with a configurable timeout
- Result : Returns a list of responsive IP addresses for user selection
06
Dashboard Home Screen :
- Overview : Central hub for store operations
- Widgets : Featured banner (“Start Billing Your Customers”), quick stats row (Orders / Revenue / Items), 2×2 action grid (Products, Cart, Printer, Reports), and Recent Activity placeholder
- Navigation Drawer : Links to Home, Products, Printer Settings, Order History (coming soon), Settings, and About
07
Modern Snackbar Notifications :
- Typed and styled floating toast system replacing default GetX snackbars
- Success (green), Error (red), Info (blue) — each with matching icon and color
- Cart actions, printer connection results, scan results, and cart clearing operations
Our Services
What We Build
Third Party SDKs & Libraries
Carefully selected integrations powering this project's core functionality.
ESC POS Printer Plus
ESC POS Utils Plus
GetX
Cupertino Icons
4 integrations used in this project
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