# labelibre: direct SUPVAN T50M Pro printing over a reconstructed BLE protocol

> labelibre implements direct Bluetooth printing to the SUPVAN T50M Pro using protocol knowledge from community analysis of the Katasymbol app. It parses Labelife AML labels into one-bit images, compresses print buffers with LZMA and sends data frames through a BLE transport from a macOS app or CLI.

- Type: Case study
- Targets: Protocol
- Category: Independent reconstruction cases
- Relationship: Independent reconstruction project
- Sources reviewed: 2026-11-06
- Added to the catalog: 2026-11-09
- Original resource: <https://github.com/louisalexander/labelibre>
- Primary source: <https://github.com/louisalexander/labelibre/blob/ea908d4caac8d02bb0d00e3bd12bdf8664d93a34/README.md>
- Catalog page: <https://awesomerea.org/resources/labelibre-supvan-case/>
- Record JSON: <https://awesomerea.org/resources/labelibre-supvan-case/record.json>
- Chinese version: [简体中文](https://awesomerea.org/zh/resources/labelibre-supvan-case/index.md)

## Requirements & limits

- **Prerequisites:** macOS 12+, Python 3.13 and a SUPVAN T50M Pro printer with Bluetooth access.
- **Prerequisites:** The printer must be on and disconnected from the phone app.
- **Limits:** AML rendering supports Image elements; text and barcode elements are skipped.
- **License:** MIT license.

## Primary sources

1. <https://github.com/louisalexander/labelibre/blob/ea908d4caac8d02bb0d00e3bd12bdf8664d93a34/README.md>

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## About this entry

The description was reviewed against primary sources.
Original editorial content: MIT. Linked projects, papers and assets retain their own rights and licenses.