Case study

KATASYMBOL E12 Lab: reconstructing BLE label printing

KATASYMBOL E12 Lab reconstructs BLE printing for E12-class label makers in Python. It combines a protocol library, command-line printer, Tkinter GUI and raw command harness, documenting GATT characteristics, 0x7E 0x5A command frames and compressed 512-byte raster frames.

Targets: Protocol
Category: Independent reconstruction cases
Relationship: Independent reconstruction project
Sources reviewed: 2026-11-06
Evidence class: C2 code & docs, no demo or download

Stars: 4
Last commit: 2026-09-26
Language: Python
License (GitHub): MIT

GitHub data as of 2026-11-10

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Evidence

Observed: Code and documentation observed; no download method or demo found.
Checked: 2026-11-08

How evidence classes are assigned

Requirements & limits

Prerequisites: Python 3.10 or later and an E12-class BLE label printer are required.
Testing evidence: The author reports the most reliable path on a 96-dot, 12 mm E12 printer using service fee7 and characteristic fec1.
Limits: Command timing and status behavior may differ across firmware revisions.
License: MIT license.

Cite

BibTeX

@misc{katasymbol-e12-lab-case,
  title = {{KATASYMBOL E12 Lab: reconstructing BLE label printing}},
  howpublished = {\url{https://github.com/eteriall/katasymbol-e12-lab}},
  url = {https://github.com/eteriall/katasymbol-e12-lab},
  urldate = {2026-11-06},
  note = {Awesome REA entry: \url{https://awesomerea.org/resources/katasymbol-e12-lab-case/}}
}

Plain text

KATASYMBOL E12 Lab: reconstructing BLE label printing. https://github.com/eteriall/katasymbol-e12-lab (accessed 2026-11-06). Awesome REA entry: https://awesomerea.org/resources/katasymbol-e12-lab-case/

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Primary sources

README.md GitHub · eteriall/katasymbol-e12-lab · Revision 9e1d79f
LICENSE GitHub · eteriall/katasymbol-e12-lab · Revision 9e1d79f