This directory contains command-line tools for Bluetooth development.

bt-hci-tool

bt-hci-tool uses the host HCI library to send HCI commands directly to a bt-hci device (/dev/class/bt-hci/000 by default)

Currently all bt-hci devices are automatically claimed by the bt-host driver. To use bt-hci-tool, disable the bt-host driver by passing driver.bthost.disable to the kernel command line:

On host machine:

$ fx pave -- driver.bthost.disable

On Fuchsia:

$ bt-hci-tool reset
  Sent HCI_Reset (id=1)
  Command Complete - status 0x00 (id=1)
$ bt-hci-tool read-bdaddr
  Sent HCI_Read_BDADDR (id=1)
  Command Complete - status 0x00 (id=1)
  BD_ADDR: 00:1A:7D:DA:71:0A

bt-snoop-cli

bt-snoop-cli is a command line client of the bt-snoop service. bt-snoop monitors snoop channels for all bluetooth adapters on the system. bt-snoop-cli subscribes to snoop logs for HCI devices and writes traffic to a file (stdout by default) supporting the pcap format. The captured packets can be visualized using any protocol analyzer that supports pcap (e.g. Wireshark).

This will fetch the current buffer of packets for all devices under /dev/class/bt-hci/, output the traffic to stdout, then exit:

$ bt-snoop-cli --dump --format pretty

To initiate a live capture using Wireshark (on host):

$ fx shell bt-snoop-cli | wireshark -k -i -

To specify a custom HCI device (“005”) and output location (on device):

$ bt-snoop-cli --output /my/custom/path --device 005

Logs can then be copied from the Fuchsia device and given to any tool that can parse BTSnoop (e.g. Wireshark):

$ fx cp --to-host :/tmp/btsnoop.log ./
$ wireshark ./btsnoop.log

See the tool's help for complete usage:

$ bt-snoop-cli --help

bt-cli

bt-cli is a command-line interface for the Generic Access Profile (using the control FIDL interfaces). This can be used to query available Bluetooth controllers, to perform dual-mode discovery and connection procedures, and to respond to pairing requests.

The bluetooth process does not need to be run directly before using bt-cli, as it will be launched by sysmgr if necessary.

$ bt-cli
bt> list-adapters
Adapter:
        Identifier:     35700c9b-6748-4676-bd2c-1d863fd89210
        Address:        28:C6:3F:2F:D4:14
        Technology:     DualMode
        Local Name:     fuchsia fuchsia-unset-device-name
        Discoverable:   false
        Discovering:    false
        Local UUIDs:    None

Other Tools

This package contains additional tools. Refer to each tool's own README for more information.