Broadcast scanning is how an Auracast device finds what is in range: the transmitter advertises its name, contents and configuration, and your assistant assembles those advertisements into a pick list. When a scan comes up empty, the fix order is firmware, battery, distance — and a posted QR code bypasses the list entirely.
Figures on this page were checked September 2026. Protocol details follow the Bluetooth SIG’s public documentation.
What scanning actually sees
The scan is the front door of the whole system, and what it sees has a defined shape. Per the SIG’s assistant white paper, every broadcast advertisement carries the essentials a listener needs to choose: the broadcast name, the contents, the configuration and more — including whether the stream is encrypted, in which case the user needs to obtain a Broadcast_Code. The assistant’s job is to sweep for those advertisements and turn them into the pick list.
The white paper is also candid about why scanning lives where it does: the discovery task is "relatively power-hungry," so the design takes it "away from devices like earbuds and hearing aids, which have small batteries." Assistants scan; receivers play. A hearing aid wearer’s phone does the sweeping, and the aid conserves its battery for the stream.
Two properties of the scan shape the experience. It is range-bound — only nearby transmitters appear, which is why walking closer changes the list. And it is name-driven — the advertisement’s name is the menu text, so venues that name broadcasts after rooms make the list self-navigating.
Scan entries by device
The scan runs wherever the assistant role runs, and the entries differ by device family:
| Device family | Where the scan lives | Documented |
|---|---|---|
| Galaxy phones | Quick Settings → Audio Broadcast → Listen tab | Samsung support pages, 2026-09-24 |
| Galaxy Buds | Buds settings → "Listen to audio broadcast" | Samsung support pages, 2026-09-24 |
| Hearing aids | Aid controls or the maker’s companion app; remotes can scan directly | SIG assistant enumeration + manufacturer apps |
| Venue shortcut | Posted QR code joins directly, past the list | Frankfurt Airport case, SIG blog |
The Samsung paths are the documented reference; other manufacturers document their own controls, and the how-to-use page indexes the flow by device. The constant across every family is the output: a list of in-range broadcasts, named, ready to join.
The empty-list checklist
An empty scan is diagnosable, and the checks run in a fixed order.
Firmware first: receivers gain broadcast support and scanning fixes through updates, and an aid or earbud a version behind is the most common silent failure. Battery second: scanning is the power-hungry task the SIG moved off small devices — a receiver near empty may scan unreliably or skip the scan. Distance and placement third: broadcasts are radio with real range limits, and walls, crowds and basements all thin the list. And the intended-audience check last: an encrypted broadcast appears in the list but will not play without its Broadcast_Code, so a locked venue stream that shows up and stalls is asking for the code, not for a better antenna.
The QR-code route resolves most list confusion where it is offered: the code encodes the join directly, so the list step disappears along with its failure modes. Frankfurt Airport’s gate broadcast runs exactly that way, and venues copying the pattern post the code where the audience cannot miss it.
Update firmware at home, arrive with charge, and walk to the middle of the space before scanning — radios reward center positions. If the venue posts a code, use it; if not, the list will name what is on offer. A working scan is quiet and boring, and that is what a good one looks like.
FAQ
The discovery step of the flow: an assistant device (phone, smartwatch or hearing aid remote) listens for Auracast advertisements in range and lists them. Each advertisement carries what the SIG's white paper describes — the broadcast name, its contents and configuration — which is what turns a scan into a menu.
The name is the only thing a listener sees before joining. Venues that name broadcasts after rooms or functions ("Gate A16," "Sanctuary") make the list self-navigating; a generic name makes every join a guess. If you host broadcasts, name them for the listener.
No — encryption gates playback, not discovery. Per the SIG's assistant white paper, the announcement carries whether the stream is encrypted and that a Broadcast_Code is needed; a locked broadcast can appear in the list and simply will not play without its code.
It is likely an encrypted stream waiting for its code. Enter the Broadcast Code the host provided (via QR code, ticket or program), and the audio plays. If no code was offered, the broadcast is not intended for you — the host controls who joins.
blafili Bicast XLR Transmitter
XLR and USB-C inputs with Bluetooth 5.2 and a broadcast mode for feeding several receivers at once. Built for studios, venues and shared listening.
- Bluetooth SIG, "How to build an Auracast assistant" white paper: broadcast advertisements carry "broadcast name, contents, configuration..."; the Public Broadcast Announcement provides "Whether the stream is encrypted, in which case the user needs to obtain a Broadcast_Code"; scanning taken away from earbuds and hearing aids (small batteries). bluetooth.com, accessed 2026-09-24
- Bluetooth SIG, Auracast FAQ: assistant enumeration; Wi-Fi-like join flow. bluetooth.com/auracast/faq/, accessed 2026-09-24
- Bluetooth SIG blog, Frankfurt Airport coverage — QR code joining the gate broadcast. bluetooth.com/blog/auracast-broadcast-audio-takes-off-at-frankfurt-airport/, accessed 2026-09-24
- Samsung Support, ANS10001042, "Broadcast audio from your Galaxy phone": Quick Settings > Audio Broadcast > Listen tab; Galaxy Buds settings > "Listen to audio broadcast." samsung.com/us/support/answer/ANS10001042/, accessed 2026-09-24