Difference between revisions of "Bluetooth"

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(GNOME Bluetooth: bluetooth-panel-applet-git renamed to gnome-bluetooth-applet-git, and available again)
(Nautilus cannot browse files: gvfs-obexftp is broken, and no longer maintained)
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  Class = 0x100100
 
  Class = 0x100100
  
This was the only solution to make my computer visible for my phone.
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This was the only solution to make my computer visible for my phone.
 
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=== Nautilus cannot browse files ===
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If nautilus doesn't open and show this error:
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Nautilus cannot handle obex: locations. Couldn't display "obex://[XX:XX:XX:XX:XX:XX]/".
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Install {{Pkg|gvfs-obexftp}} package.
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Revision as of 07:20, 20 December 2013

Template:Article summary start Template:Article summary text Template:Article summary heading Template:Article summary wiki - Article describing operation of deprecated v4 of Bluez. Template:Article summary wiki Template:Article summary end

Bluetooth is a standard for the short-range wireless interconnection of cellular phones, computers, and other electronic devices. In Linux, the canonical implementation of the Bluetooth protocol stack is BlueZ.

Installation

Install the Bluetooth protocol stack bluez and the utilities bluez-utils from the official repositories. The dbus daemon, which is started automatically by systemd, is used to read settings and for PIN pairing, while the bluetooth daemon is required for the Bluetooth protocol.

Start the bluetooth systemd service: # systemctl start bluetooth.

Note: Some Bluetooth adapters are bundled with a Wi-Fi card (e.g. Intel Centrino). These require that the Wi-Fi card is first enabled (typically a keyboard shortcut on a laptop) in order to make the Bluetooth adapter visible to the kernel.

Configuration via the CLI

Bluetoothctl

Pairing a device from the shell is one of the most simplistic and reliable options. The exact procedure depends on the devices involved and their input functionality. What follows is a general outline of pairing a device using /usr/bin/bluetoothctl:

Start the bluetoothctl interactive command. There one can input help to get a list of available commands.

  • Turn the power to the controller on by entering power on. It is off by default.
  • Enter devices to get the MAC Address of the device with which to pair.
  • Enter device discovery mode with scan on command if device is not yet on the list.
  • Turn the agent on with agent on.
  • Enter pair MAC Address to do the pairing (tab completion works).
  • If using a device without a PIN, one may need to manually trust the device before it can reconnect successfully. Enter trust MAC Address to do so.
  • Finally, use connect MAC_address to establish a connection.

An example session may look this way:

# bluetoothctl 
[NEW] Controller 00:10:20:30:40:50 pi [default]
[bluetooth]# agent KeyboardOnly 
Agent registered
[bluetooth]# default-agent 
Default agent request successful
[bluetooth]# scan on
Discovery started
[CHG] Controller 00:10:20:30:40:50 Discovering: yes
[NEW] Device 00:12:34:56:78:90 myLino
[CHG] Device 00:12:34:56:78:90 LegacyPairing: yes
[bluetooth]# pair 00:12:34:56:78:90
Attempting to pair with 00:12:34:56:78:90
[CHG] Device 00:12:34:56:78:90 Connected: yes
[CHG] Device 00:12:34:56:78:90 Connected: no
[CHG] Device 00:12:34:56:78:90 Connected: yes
Request PIN code
[agent] Enter PIN code: 1234
[CHG] Device 00:12:34:56:78:90 Paired: yes
Pairing successful
[CHG] Device 00:12:34:56:78:90 Connected: no

In order to have the device active after a reboot, a udev rule is needed: /etc/udev/rules.d/10-local.rules

# Set bluetooth power up
ACTION=="add", KERNEL=="hci0", RUN+="/usr/bin/hciconfig hci0 up"

Configuration with a Graphical Front-end

The following packages allow for a graphical interface to customize Bluetooth.

GNOME Bluetooth

GNOME Bluetooth is a fork of the old bluez-gnome and is focused on integration with the GNOME desktop environment. GNOME Bluetooth is required by gnome-shell. Many will have it installed due to dependencies within the GNOME 3 environment. Otherwise, it can be installed with the package gnome-bluetooth.

Run bluetooth-applet for a nice Bluetooth applet. In newer versions, for this to work, one may need to install gnome-bluetooth-applet-gitAUR which allows the setup devices and transfer of files by right-clicking the Bluetooth icon. To make the applet run on login, add it to System > Preferences > Startup Applications.

To add a Bluetooth entry to the SendTo menu in Thunar's file properties menu, see instructions here.

BlueDevil

The Bluetooth tool for KDE is BlueDevil. It can be installed with the package bluedevil, available in the official repositories.

Make sure bluetooth daemon is running, as described above. A Bluetooth icon should be visible in both Dolphin and in the system tray, from which users may configure BlueDevil and detect Bluetooth devices by clicking the icon. An interface is also available from the KDE System Settings.

Fluxbox, Openbox, other WM

The preceding applications can be used even if GNOME, Xfce or KDE are not primary desktop managers. This list should help understand which application does what:

  • bluetooth-applet -- tray icon with access to settings, pairing wizard, management of known devices.
  • /usr/lib/gnome-user-share/gnome-user-share -- needs to be running to support file transfers via obexBT from a paired/bonded device.

Some known transmission errors can be fixed by creating the following:

/etc/dbus-1/system.d/bluetooth.conf

 <policy user="your_user_id">
   <allow own="org.bluez"/>
   <allow send_destination="org.bluez"/>
   <allow send_interface="org.bluez.Agent"/>
 </policy>
  • bluetooth-wizard - for new devices to be paired
  • bluetooth-properties - accessible also via bluetooth-applet icon
  • gnome-file-share-properties - permissions on receiving files via Bluetooth
  • bluez-sendto - GUI for sending files to a remote device


Using Obex for sending and receiving files

Another option, rather than using KDE or Gnome Bluetooth packages, is ObexFS which allows for the mounting of phones which are treated like any other filesystem.

Note: To use ObexFS, one needs a device that provides an ObexFTP service.

Install obexfs and mount supported phones by running:

$ obexfs -b devices_MAC_address /mountpoint

For more mounting options see http://dev.zuckschwerdt.org/openobex/wiki/ObexFs

For devices don't support Obex FTP service, check if Obex Object Push is supported.

# sdptool browse XX:XX:XX:XX:XX:XX

Read the output, look for Obex Object Push, remember the channel for this service. If supported, one can use ussp-push to send files to this device:

# ussp-push XX:XX:XX:XX:XX:XX@CHANNEL file wanted_file_name_on_phone

Examples

All examples have been moved to section bluez4. They need to be checked and fixed for use with bluez5. See section Bluez4 below.

Troubleshooting

gnome-bluetooth

If you see this when trying to enable receiving files in bluetooth-properties:

Bluetooth OBEX start failed: Invalid path
Bluetooth FTP start failed: Invalid path

Then install xdg-user-dirs and issue:

$ xdg-user-dirs-update

You can edit the paths using:

$ vi ~/.config/user-dirs.dirs

Bluetooth USB Dongle

If you are using a USB dongle, you should check that your Bluetooth dongle is recognized. You can do that by inspecting /var/log/messages.log when plugging in the USB dongle (or running journalctl -f with systemd). It should look something like the following (look out for hci):

Feb 20 15:00:24 hostname kernel: [ 2661.349823] usb 4-1: new full-speed USB device number 3 using uhci_hcd
Feb 20 15:00:24 hostname bluetoothd[4568]: HCI dev 0 registered
Feb 20 15:00:24 hostname bluetoothd[4568]: Listening for HCI events on hci0
Feb 20 15:00:25 hostname bluetoothd[4568]: HCI dev 0 up
Feb 20 15:00:25 hostname bluetoothd[4568]: Adapter /org/bluez/4568/hci0 has been enabled

For a list of supported hardware please refer to the Resource section on this page.

If you only get the first two lines, you may see that it found the device but you need to bring it up. Example:

hciconfig -a hci0
hci0:	Type: USB
	BD Address: 00:00:00:00:00:00 ACL MTU: 0:0 SCO MTU: 0:0
	DOWN 
	RX bytes:0 acl:0 sco:0 events:0 errors:0
        TX bytes:0 acl:0 sco:0 commands:0 errors:
# hciconfig hci0 up
hciconfig -a hci0
hci0:	Type: USB
	BD Address: 00:02:72:C4:7C:06 ACL MTU: 377:10 SCO MTU: 64:8
	UP RUNNING 
	RX bytes:348 acl:0 sco:0 events:11 errors:0
        TX bytes:38 acl:0 sco:0 commands:11 errors:0

If this fails with an error like:

Operation not possible due to RF-kill

it could be due either to the rfkill utility, in which case it should be resolved with

# rfkill unblock all

or, it could simply be the hardware switch of the computer. The hardware bluetooth switch (at least sometimes) controls access to USB bluetooth dongles also. Flip/press this switch and try bringing the device up again.

To verify that the device was detected you can use hcitool which is part of the bluez-utils. You can get a list of available devices and their identifiers and their MAC address by issuing:

$ hcitool dev
Devices:
        hci0	00:1B:DC:0F:DB:40

More detailed informations about the device can be retrieved by using hciconfig.

$ hciconfig -a hci0
hci0:   Type: USB
        BD Address: 00:1B:DC:0F:DB:40 ACL MTU: 310:10 SCO MTU: 64:8
        UP RUNNING PSCAN ISCAN
        RX bytes:1226 acl:0 sco:0 events:27 errors:0
        TX bytes:351 acl:0 sco:0 commands:26 errors:0
        Features: 0xff 0xff 0x8f 0xfe 0x9b 0xf9 0x00 0x80
        Packet type: DM1 DM3 DM5 DH1 DH3 DH5 HV1 HV2 HV3
        Link policy: RSWITCH HOLD SNIFF PARK
        Link mode: SLAVE ACCEPT 
        Name: 'BlueZ (0)'
        Class: 0x000100
        Service Classes: Unspecified
        Device Class: Computer, Uncategorized
        HCI Ver: 2.0 (0x3) HCI Rev: 0xc5c LMP Ver: 2.0 (0x3) LMP Subver: 0xc5c
        Manufacturer: Cambridge Silicon Radio (10)

Logitech Bluetooth USB Dongle

There are Logitech dongles (ex. Logitech MX5000) that can work in two modes Embedded and HCI. In embedded mode dongle emulates a USB device so it seems to your PC that your using a normal USB mouse/keyoard.

If you hold the little red Button on the USB BT mini-receiver it will enable the other mode. Hold the red button on the BT dongle and plug it into the computer, and after 3-5 seconds of holding the button, the Bluetooth icon will appear in the system tray. Discussion

hcitool scan: Device not found

  • On some Dell laptops (e.g. Studio 15) you have to switch the Bluetooth mode from HID to HCI using
# hid2hci
Note: hid2hci is no longer in the $PATH, it is under /lib/udev/hid2hci, but udev should run it automatically for you.
  • If the device won't show up and you have a Windows operating system on your machine, try booting it and enable the bluetooth adapter from windows.
  • Sometimes also this simple command helps:
# hciconfig hci0 up

rfkill unblock: Do not unblock

If your device still soft blocked and you run connman.

Try this: $ connmanctl enable bluetooth

My computer is not visible

Can't discover computer from your phone? Enable PSCAN and ISCAN:

# enable PSCAN and ISCAN
$ hciconfig hci0 piscan 
# check it worked
$ hciconfig
hci0:   Type: USB
        BD Address: 00:12:34:56:78:9A ACL MTU: 192:8 SCO MTU: 64:8
        UP RUNNING PSCAN ISCAN
        RX bytes:20425 acl:115 sco:0 events:526 errors:0
        TX bytes:5543 acl:84 sco:0 commands:340 errors:0
Note: Check DiscoverableTimeout and PairableTimeout in /etc/bluetooth/main.conf

Try changing device class in /etc/bluetooth/main.conf as following:

# Default device class. Only the major and minor device class bits are
# considered.
#Class = 0x000100 (from default config)
Class = 0x100100

This was the only solution to make my computer visible for my phone.