Kotlin Library

Printer-ESC-POS

A powerful Kotlin library for ESC/POS thermal printers, supporting Bluetooth, USB, and TCP connections.

Role: Lead Open Source MaintainerTimeline: 2021 - Present
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Project Overview

Printer-ESC-POS is a premier open-source Kotlin library built to solve the fragmentation of thermal printing APIs on Android. It handles character set mapping, bitmap rendering, barcode/QR configurations, and low-level byte-command packaging for various hardware channels.

Key Deliverables

  • ✓
    Universal ESC/POS byte generator for Bluetooth, USB, and TCP sockets
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    Advanced bitmap conversion algorithms for printing high-contrast logos
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    Comprehensive multi-language formatting and text alignment
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    Supports standard barcodes and high-density QR code prints

Project Links

GitHub Repository Live Application Discuss Project Details

Tech Stack

KotlinAndroid SocketsBluetooth Serial APICoroutines

Engineering Challenges

Fragmented thermal printer hardware support. Solved by implementing standard buffering, customizable line-feed delays, and custom character-encoding tables.

Resolved and implemented in production.