The nRF Logger for Bluetooth Host Controller Interface (HCI) is an external capture plugin for Wireshark that captures HCI packets from Nordic Semiconductor devices.
Tip
You can also capture HCI packets from the command line using the hci subcommand.
HCI packets are packets exchanged between the Bluetooth Host and the Bluetooth Controller inside the Bluetooth stack. The combined set of HCI and BLE sniffer logs gives a detailed view of what happens both inside and between Bluetooth devices. For more information about HCI, see Bluetooth Core Specification, Volume 4, Part E.