MQTT Discovery Gateway for radio sensors like ABUS Secvest 2Way (unofficial)

Blueprints Exchange
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Hi everyone,

I’m sharing a Home Assistant automation blueprint that turns a JeeLink USB dongle into a serial radio gateway for sec2way 868 MHz sensors like the ones from ABUS Sevcest system, and publishes everything to MQTT with Discovery so entities show up automatically.

This is useful if you have existing sec2way door contacts / sensors and want to integrate (read-only) them into Home Assistant without a dedicated proprietary gateway/alarm system.

:white_check_mark: What it does

  • Reads decoded telegrams from a serial text sensor (Serial integration)
  • Publishes MQTT topics per sensor
  • Uses MQTT Discovery to auto-create entities
  • Optional “Discovery” toggle to control automatic entity creation
  • Creates entities like:
    • Door / state (open/closed etc.)
    • Tamper
    • Battery low
    • Last seen / diagnostics
    • RSSI

I have tested it with door, motion and fire sensors.

:nut_and_bolt: Requirements

  • Home Assistant + MQTT broker
  • A JeeLink USB dongle flashed with the included firmware (simple receiver/decoder firmware)
  • Serial integration set up so HA receives the line-based telegrams from the dongle

:package: Installation

1) Flash the firmware

  • Firmware binaries are included in the GitHub release (no toolchain required).
  • Flashing is manual (Arduino IDE / avrdude depending on your setup).

2) Add the serial line sensor

  • Add your USB dongle via Home Assistant Serial integration and make sure it produces line text.

3) Import the blueprint

Open your Home Assistant instance and show the blueprint import dialog with a specific blueprint pre-filled.

4) Configure

  • Select the serial line sensor entity
  • Select the MQTT base topic / discovery prefix if needed
  • Enable “Discovery” and watch entities appear

:link: Links

:brain: Notes / disclaimers

  • This is an unofficial community project and not affiliated with any manufacturer.
  • It’s intended for receiving and integrating your own sensors in Home Assistant.

:fire_extinguisher: Support / feedback

If you run into issues, please include:

  • Your HA version
  • The raw serial line example (a few lines)
  • Your blueprint YAML (Automation → 3 dots → Edit in YAML → copy)

PRs, ideas, and testing feedback are very welcome.

:spiral_notepad: Changelog

  • v1.0.0 – Initial release