This is the documentation for the latest (main) development branch of Zephyr. If you are looking for the documentation of previous releases, use the drop-down menu on the left and select the desired version.

Bluetooth: Central ISO


This sample demonstrates how to use an isochronous channel as a central. The sample scans for a peripheral, establishes a connection, and sets up a connected isochronous channel to it. Once the isochronous channel is connected, isochronous data is transferred to the peer device every 10 milliseconds. It is recommended to run this sample together with the Bluetooth: Peripheral ISO sample.

To run the sample with an encrypted isochronous channel, enable CONFIG_BT_SMP.


  • BlueZ running on the host, or

  • A board with Bluetooth Low Energy 5.2 support

  • A Bluetooth Controller and board that supports setting CONFIG_BT_CTLR_CENTRAL_ISO.

Building and Running

This sample can be found under samples/bluetooth/central_iso in the Zephyr tree.

  1. Start the application. In the terminal window, check that it is scanning for other devices.

    Bluetooth initialized Scanning successfully started Device found: D3:3A:5D:F5:73:33 (random) (RSSI -78) Device found: 70:7B:F4:2B:76:AD (random) (RSSI -68) Device found: 65:CF:20:0D:CB:9D (random) (RSSI -82)

  2. Observe that the device connects.

    Connected: 65:CF:20:0D:CB:9D (random)

  3. Observe that the ISO channel is connected

    ISO Channel 0x200048f8 connected

See bluetooth samples section for more details.