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I am building a React Native (Android) application that connects to a Bluetooth LE fetal doppler device.
The BLE connection works correctly and I receive live packets (0x71 command) that contain audio data.

What works

  • BLE scanning, connection, and notifications work

  • I continuously receive audio packets (0x71) from the device

  • Heart rate (FHR) and other data are decoded correctly

  • Audio waveform visualization updates correctly in the UI

  • Native module is registered correctly (NativeModules.HeartAudioPlayer is not null)

What does NOT work

  • No live sound is audible

  • Audio feels like silent / broken chunks

    • No continuous playback even though packets arrive at high frequency
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  • Sharing the relevant sections of your logic or any logs, will allow others to assist you. Commented Dec 15, 2025 at 7:06

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