Nabu Casa Launches $69 AUX-2 to Revive Legacy Audio and Serial Devices

Key points

• The Home Assistant Connect AUX-2 is priced at $69 and is manufactured by Nabu Casa, the commercial arm of the Open Home Foundation.
• The device includes two RS-232 serial ports, a 3.5mm analog audio jack, an optical S/PDIF output, and a Grove port for sensors.
• It supports 2.4GHz Wi-Fi, Bluetooth 5 Low Energy, Ethernet with Power-over-Ethernet, and USB-C for power.
• The hardware runs on ESPHome firmware, allowing it to be configured directly within the Home Assistant ecosystem without a separate app.
• Audio synchronization is achieved via Sendspin and Music Assistant, enabling legacy speakers to play in sync with modern systems like Sonos or AirPlay.
• Serial connectivity allows control of devices such as LG and Samsung TVs, bypassing their native network interfaces and cloud dependencies.

Background

This release follows a trend of manufacturers discontinuing support for older hardware features, such as Amazon disabling voice control for AUX inputs on older Echo speakers in October 2026. The AUX-2 addresses the growing issue of planned obsolescence, where functional devices become unusable due to the shutdown of cloud services or the lack of smart integration. It aligns with a broader consumer push for open-source, local-first smart home solutions that extend the lifespan of existing electronics.

How outlets are covering it

ZDNET emphasizes the device’s role in fighting planned obsolescence and abandoned cloud services, highlighting its potential to modernize older tech. The Verge notes the device’s ease of setup and its function as a multi-tool for various connectivity needs, including Z-Wave and Zigbee expansion. XDA focuses on the practical application of synchronizing legacy audio equipment with modern streaming services like Spotify and Sonos, praising the simplicity of the setup process. Hackster.io highlights the technical specifications, including the ESP32-S3 microcontroller and the ability to control privacy-sensitive devices like smart TVs via serial connections without network exposure. All sources agree on the device’s utility but differ in emphasis, with XDA focusing on audio performance and Hackster.io on hardware security and open-source flexibility.

Why it matters

The AUX-2 provides a cost-effective solution for consumers looking to avoid replacing functional but non-smart devices. By enabling local control and audio synchronization, it reduces reliance on manufacturer cloud services, which are increasingly being discontinued. This supports sustainability by extending the life of existing hardware and offers greater privacy by allowing control of devices without connecting them to the internet. For Home Assistant users, it expands the platform’s reach into legacy audio and serial-controlled equipment, enhancing the overall smart home experience without requiring new purchases.

What to watch

Nabu Casa is currently developing network support for the Connect ZBT-2 Zigbee adapter, which is expected to complement the AUX-2’s capabilities. The company has stated that the Zigbee adapter is not yet recommended for most networks but is in active development. Users can expect further updates to the AUX-2’s firmware and potential new integrations as the open-source community continues to explore its capabilities. The device is available for purchase now, and early adopters are likely to share more use cases and configurations in the coming weeks.