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Bluetooth

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Revision as of 02:14, 15 November 2012 by Reisio (Talk | contribs)

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This article describes the setup of bluetooth controllers.

Installing

Prerequisites

Bluez uses udev, so set it up first.

Kernel

You need USB and/or PC-Card support. Also you need to activate the following kernel options:

Kernel configuration

[*] Networking support  --->
    <*> Bluetooth subsystem support  --->
        
        Select options for Bluetooth applications, see table below:
        <*>   ...

            Bluetooth device drivers  --->

               Select a Bluetooth HCI driver, e.g.:
               <*> HCI USB driver (btusb)
Bluetooth applications
Option Driver Description
RFCOMM protocol support rfcomm RFCOMM is a requirement of the OBEX-file transfer, dialup connections and more bluetooth applications.
RFCOMM TTY support - Enables terminal emulator connections over RFCOMM.
BNEP protocol support bnep Enables network support, e.g. for the PAN profile.
Multicast filter support - Enables multicast filter support.
Protocol filter support - Enables protocoll filter support.
HIDP protocol support hidp Enables input device support. See the Bluetooth Input devices article.

Software

Portage knows the global USE flag bluetooth for enabling support for Bluetooth in other packages. Enabling this USE flag will pull in net-wireless/bluez automatically:

File/etc/portage/make.conf

USE="... bluetooth ..."

The USE flags of bluez are:

→ Information about USE flags
USE flag Default Recommended Description
alsa Yes Adds support for media-libs/alsa-lib (Advanced Linux Sound Architecture)
consolekit Yes Use sys-auth/pambase[consolekit] to determine access to bluetooth devices based on whether a user is logged in locally or remotely
cups Yes Add support for CUPS (Common Unix Printing System)
debug No Enable extra debug codepaths, like asserts and extra output. If you want to get meaningful backtraces see http://www.gentoo.org/proj/en/qa/backtraces.xml
gstreamer No Adds support for media-libs/gstreamer (Streaming media)
pcmcia No Adds support for PCMCIA slots/devices found on laptop computers
readline Yes Enables support for libreadline, a GNU line-editing library that almost everyone wants
test-programs No Install tools for testing of various Bluetooth functions
usb Yes Adds USB support to applications that have optional USB support (e.g. cups)

After setting this you want to update your system so the changes take effect:

root # emerge --ask --changed-use --deep @world

Configuration

Service

You can now start bluetooth:

root # /etc/init.d/bluetooth start

To start bluetooth at boot time, add it your default runlevel:

root # rc-update add bluetooth default

Permissions

If you have the USE flag acl enabled globally and are using ConsoleKit (i.e you're using a desktop profile) permissions to bluetooth devices will be handled automatically.

A broader solution is to add the user you want to be able to access bluetooth devices to the plugdev group:

root # gpasswd -a larry plugdev

Usage

Device Attach/Pairing

Before a device can be used, it must be attached (paired in Bluetooth-lingo). This is done by entering a PIN (or other code) on both devices.

Note
Some simple devices like headsets do not allow entering an arbitrary PIN, they always use the same one (usually 0000 or 9999). Check the manual of your device which is to be used.

In order to pair, you must first have the interaction agent active. Most desktop environments have bluetooth integration so will automatically support the interaction agent. For example, KDE has net-wireless/bluedevil.

Using the simple-agent

Configuration can either be performed using the BlueZ test programs (available if you enable the test-programs USE flag for bluez), or by using the D-Bus API. The first way is described here.

The first step to do is to retrieve the address of the mouse. Most of the devices need you to press a special button, possibly for several seconds, to render them discoverable.

root # hcitool scan
Scanning ...
	00:1F:20:1D:1B:4B	Bluetooth Laser Travel Mouse

Where 00:1F:20:1D:1B:4B is the MAC address for your device.


The second step to do is to pair the device:

root # simple-agent hci0 00:1F:20:1D:1B:4B
RequestPinCode (/org/bluez/1664/hci0/dev_00_1F_20_1D_1B_4B)
Enter PIN Code: 0000
Release
New device (/org/bluez/1664/hci0/dev_00_1F_20_1D_1B_4B)

Enter a PIN and press Enter, then enter the same PIN at the device. If you don't know the PIN, then it is probably 0000. It could be 1234.

If you get the following output, it means that you already have an interaction agent running on your system:

root # simple-agent
dbus.exceptions.DBusException: org.bluez.Error.AlreadyExists: Already Exists


The third step is to mark the device as trusted so it can connect automatically:

root # bluez-test-device trusted 00:1F:20:1D:1B:4B yes

That should return you to a prompt with no output. To test if it's trusted issue "bluez-test-device trusted 00:1F:20:1D:1B:4B" without yes:

root # bluez-test-device trusted 00:1F:20:1D:1B:4B
1

If you get 1 then it is trusted. 0 is the default value (not trusted) - you want that to change to 1 (trusted).


The fourth step is to connect the device (this only needs to be done once, it will be done automatically after that):

root # bluez-test-input connect 00:1F:20:1D:1B:4B

This should also return you to a prompt, and the device should now be paired and working.

You are now ready to proceed.

Desktop integration

See also