AIDD — AI Driven Development This project was written using AI-assisted development. The architecture, implementation, and documentation were produced through iterative collaboration with AI coding assistants (GitHub Copilot / Claude). Human judgment directed the design; AI did the heavy lifting.

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What is this?

The GOOJPRT PT-210 is a compact 58 mm Bluetooth thermal printer sold under various white-label brands. GOOJPRT provides no official SDK, no protocol documentation, and no support for third-party integration. This library fills that gap.

It was created to enable reliable programmatic printing — text, barcodes, QR codes, bitmap images — from Python, without depending on proprietary Android apps or undocumented firmware quirks. The protocol was reverse-engineered from Bluetooth packet captures.

Full documentation: goojprt-pt210-sdk.readthedocs.io

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Features

• BLE (Bluetooth Low Energy) — async, cross-platform (macOS, Windows, Linux)
• SPP (classic RFCOMM) — synchronous, Linux only
• Text printing — native ESC/POS code pages or bitmap rendering via Pillow (supports full Unicode and diacritics)
• QR codes — built-in ESC/POS QR generation
• PDF417 barcodes — pure-Python renderer, no native deps
• Image printing — any PIL image, with optional Floyd–Steinberg dithering
• TOML templates — declarative print layouts for receipts, labels, and tickets
• Code-page probe — built-in tool to test which firmware code pages actually work

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Installation

There are two variants of the package:

Variant	What you get	Install extra
SDK only (default)	goojprt Python package + goojprt CLI	(none)
SDK + Server	everything above + goojprt-server — a FastAPI HTTP print server with live dashboard and REST API	[server]

pip

# SDK only
pip install goojprt-pt210-sdk

# SDK + HTTP print server
pip install "goojprt-pt210-sdk[server]"

uv

# SDK only
uv add goojprt-pt210-sdk

# SDK + HTTP print server
uv add "goojprt-pt210-sdk[server]"

Latest from GitHub (development)

# SDK only
pip install git+https://github.com/filipseedy/goojprt-pt210-sdk.git

# SDK + HTTP print server
pip install "git+https://github.com/filipseedy/goojprt-pt210-sdk.git#egg=goojprt-pt210-sdk[server]"

Editable install for local development

git clone https://github.com/filipseedy/goojprt-pt210-sdk.git
cd goojprt-pt210-sdk

# SDK only
pip install -e .

# SDK + HTTP print server
pip install -e ".[server]"

Requirements: Python 3.14+. Core dependencies (bleak, Pillow, pdf417) are installed automatically. The [server] extra adds FastAPI, Uvicorn, Jinja2, Rich, and Pydantic.

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Quick start

import asyncio
from goojprt import GoojPrtPT210

async def main() -> None:
    printer = GoojPrtPT210()
    await printer.connect_ble("XX:XX:XX:XX:XX:XX")
    await printer.initialize()
    await printer.print_text("Hello, world!")
    await printer.feed(3)
    await printer.disconnect()

asyncio.run(main())

Print bitmap text (full Unicode / diacritics)

await printer.print_text_image(
    "Příliš žluťoučký kůň\núpěl ďábelské ódy",
    font_size=28,
)

Print a QR code

await printer.print_qr("https://example.com", size=5)

Print a PDF417 barcode

await printer.print_pdf417("1234567890ABCDEF", columns=5, scale=2)

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CLI

# BLE demo print
goojprt XX:XX:XX:XX:XX:XX

# Bitmap text with antialiasing
goojprt XX:XX:XX:XX:XX:XX --print-image "Příliš žluťoučký kůň"

# PDF417 barcode
goojprt XX:XX:XX:XX:XX:XX --pdf417 "data"

# Print from a TOML template
goojprt XX:XX:XX:XX:XX:XX --template receipt.toml --var name=John

# Probe which code pages actually work on your unit
goojprt XX:XX:XX:XX:XX:XX --test

Run goojprt --help for all options.

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Two text paths

Path	Method	Diacritics	Speed
Native ESC/POS	print_text	Depends on firmware	Fast
Bitmap (Pillow)	print_text_image	Always correct	Slower

If diacritics appear as garbage, switch to print_text_image. Use --test (or probe_charsets()) to test your specific unit.

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TOML templates

Define a print layout in a .toml file:

[[items]]
type = "text"
text = "Receipt — {{date}}"
bold = true
align = "center"

[[items]]
type = "qr"
data = "https://example.com/{{order_id}}"

[[items]]
type = "feed"
lines = 4

Variables like {{date}}, {{time}}, {{expiry_7d}} are built-in. Pass custom variables with --var KEY=VALUE.

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Documentation

Full API reference, architecture notes, and examples are at:

goojprt-pt210-sdk.readthedocs.io

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License

MIT. See LICENSE for details.