BRIQX Multicast Bluetooth
createq BRIQX Bluetooth multicast — one ESP32-driven transmitter that can stream the same SD-card demo track to up to 5 headphones at once. Button presses and device status go live to the BRIQX dashboard over MQTT.
Retail problem it solves
Wireless headphone walls need several shoppers listening at the same time — without each person pairing to a phone or fighting one Bluetooth sink. Multicast is the BRIQX answer: the fixture plays from local storage and the Bluetooth transmitter fans the audio out to multiple headsets in parallel.
Buttons + status → MQTT → BRIQX Control
What I built on the firmware side
ESP-IDF player path reads tracks from the SD card and feeds the Bluetooth transmitter so the demo content is local, reliable, and independent of a phone or CMS stream.
Transmitter integration so ~5 headphones can connect and hear the same program at once — the multicast experience createq sells for Bluetooth retail walls.
Front-panel / XPORT button events (play, track, volume-style actions) are handled on-device and published to BRIQX Control so ops see presses, listening state, and faults in real time — same MQTT fleet as LED / Cove / Connect All.
SoftAP provision, telemetry, and OTA so a Multicast unit is a first-class BRIQX device — not a one-off Bluetooth gadget.
Stack
ESP32
Player, BT TX control, buttons, Wi-Fi / MQTT
SD card
Local demo audio — no phone required
BRIQX Control
Telemetry, button events, OTA