Bluetooth

Links

• Bluez homepage
• btsco
• bluetooth-alsa
• Asterisk channel plugin for bluetooth HandsFree Profile
• Bluetooth Company Identifiers

Terminology

gatt

Generic Attribute Profile

• https://learn.adafruit.com/introduction-to-bluetooth-low-energy/gatt

GAP

'Generic Access Profile

• https://learn.adafruit.com/introduction-to-bluetooth-low-energy/gap

HOWTO

Connect new device

bluetootctl
 scan on

Find vendor by mac address

• https://maclookup.app/
• List of MAC addresses with vendors identities
• Wireshark manufacturer database

Tools

bluetoothctl

Find devices

scan on

unpair

remove <device-id>

FAQ

Error messages

Failed to pair: org.bluez.Error.AlreadyExists

Try

paired-devices
      

Failed to connect: org.bluez.Error.Failed

hammer?

Loading LTKs timed out for hci0

Try

rmmod btusb
modprobe btusb
systemctl restart bluetooth

Keeps requiring reconnect

Check ReconnectUUIDs

To find the UUIDs:

bluetoothctl show

mobile device not found

Headphone can't find your system.

 

Bluetooth: hci0: Failed to load Intel firmware file intel/ibt-20-1-3.sfi (-2)

You might find it at https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/tree/intel

NOTE

 hciconfig hci0 up

will show it also wants hci0: Failed to load Intel DDC file intel/ibt-20-1-3.ddc
 

Failed to connect: org.bluez.Error.Failed br-connection-unknown

try

systemctl status bluetooth.service

bluetoothd[836]: profiles/audio/avdtp.c:avdtp_connect_cb() xx permision denied

try unpairing and pairing again