Summary
Explains how earbuds, hearing aids, headphones and speakers can let people choose a broadcast from an app on a phone that has no built-in Auracast assistant.
Key findings
- Section 2, pages 5-6, separates the assistant's control role from audio reception: the phone instructs the receiver to synchronize to the selected transmitter, and the receiver obtains the broadcast directly. In this topology the audio does not pass through the phone.
- Phones whose Bluetooth chips predate Core 5.2, or that lack an LE Audio host stack, cannot scan for broadcasts themselves. The receiver can scan instead and pass the list to a stand-alone app on the phone over an ordinary GATT connection, which the paper says almost every smartphone of the past ten years supports.
- Every Auracast receiver must be able to scan for broadcasts on its own, so where only one transmitter is in range, joining directly from the receiver may be enough.
- Urges makers of dual-mode receivers to implement broadcast reception first, so that users can join broadcasts without replacing their phone.
Limits
Design guidance from the SIG's market development team. It describes how products can be built, not which products do so, and it names no phone platform; in practice this route depends on each receiver maker providing an app.
Read the original
www.bluetooth.com/wp-content/uploads/2023/03/Developing_Auracast_Receivers-Legacy_Smartphones.pdf
Cited in
- How do listeners find and join the right broadcast?Open
- How many listeners carry a telecoil, an Auracast-capable device or a smartphone?Disputed
- What does a listener have to do to use each system, and where do people get stuck?Partly answered
- Can people without hearing aids benefit from venue systems through earbuds, headphones or their phones?Partly answered
Cite this source
Bluetooth SIG Market Development. Developing Auracast receivers with an assistant application for legacy smartphones. Bluetooth SIG (technical overview, version 1). 6 February 2025. https://www.bluetooth.com/wp-content/uploads/2023/03/Developing_Auracast_Receivers-Legacy_Smartphones.pdf (accessed 13 October 2026).
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