Wireshark/libpcap can live capture USB stream. There is ready HCI USB transport described in Bluetooth Core specification. Try Wireshark >=3D 1.10 and filter by "hci_usb" . Only non-standard Bluetooth USB dongles cannot work with it (however I have non-standard dongle "Broadcom Corp. BCM20702A0 Bluetooth 4.0", but it seems to be standard dongle -.