I use ReSound Nexia hearing aids, and I wanted to send audio from my MacBook straight into them: a video call, a music file, my own voice. macOS can’t do that on its own. The built-in Bluetooth can’t transmit at all, so you need a USB dongle.
I’ve never written software before, not a single line. I did this over a few days with an assistant doing the actual coding while I learned enough to follow what we were building.
The hardware lesson cost me the most, so here it is first. I started with a Sennheiser BTD 700. My hearing aids could see the broadcast and read its name, but they’d never pull the audio: “stream not found”, every time, on both an iPhone and an Android. The BTD 700 seem to only broadcast in high quality, and hearing aids can only receive the standard-quality public broadcast. It’s a fine dongle for headphones. Hearing aids need a different one.
The FlooGoo FMA120 fixed it. One setting matters: open FlooCast, put the dongle in Broadcast mode, and turn “Broadcast High-Quality Music” off. It’s stored in the dongle, so you do it once. After that my Nexia connected and the sound was just there.
The app is simple: pick a source (mic, system audio, or a file), press start. It also runs a small local API, so you can drive it from a web page or a script if you want.
Free on GitHub, do-what-you-like license: https://github.com/napthemax/auracast-sender10
One more thing that slowed me down in the beginning: on my iPhone the connection kept dropping. On Android with the ReSound app it held. iOS support still feels half-finished in 2026. This app now works fine with iOS though.
I’m not connected to FlooGoo or ReSound. Just someone who wears hearing aids and likes to tinker. Happy to help if anyone gives it a go.
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