# Schellenberg 21009: investigating a USB smart-home protocol

> Schellenberg USB protocol research documents communication with the 21009 Magenta SmartHome dongle through its USB serial interface. The reference lists operating modes, command responses, message fields, device identifiers and commands for paired Schellenberg devices, with receive and send examples.

- Type: Case study
- Targets: Protocol
- Category: Independent reconstruction cases
- Relationship: Independent reconstruction project
- Sources reviewed: 2026-11-07
- Added to the catalog: 2026-11-09
- Original resource: <https://github.com/Hypfer/schellenberg-qivicon-usb>
- Primary source: <https://github.com/Hypfer/schellenberg-qivicon-usb/blob/56bcdb1c8fcc8fc0379c413ec80ccea079d4337c/README.md>
- Catalog page: <https://awesomerea.org/resources/schellenberg-qivicon-usb-case/>
- Record JSON: <https://awesomerea.org/resources/schellenberg-qivicon-usb-case/record.json>
- Chinese version: [简体中文](https://awesomerea.org/zh/resources/schellenberg-qivicon-usb-case/index.md)

## Requirements & limits

- **Scope:** A Schellenberg 21009 Magenta SmartHome USB dongle is the documented device.
- **Limits:** Some commands and fields remain unidentified.
- **License:** No licence file in the repository.

## Primary sources

1. <https://github.com/Hypfer/schellenberg-qivicon-usb/blob/56bcdb1c8fcc8fc0379c413ec80ccea079d4337c/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.