#### Beyond Linux® From Scratch (systemd Edition) - Version 11.1

### Chapter 12. System Utilities

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# BlueZ-5.63

## Introduction to BlueZ

The BlueZ package contains the Bluetooth protocol stack for Linux.

This package is known to build and work properly using an LFS-11.1 platform.

### Package Information

- Download (HTTP): https://www.kernel.org/pub/linux/bluetooth/bluez-5.63.tar.xz

- Download MD5 sum: 00da01bebad0595ba6eb2de4c6990a63

- Download size: 2.1 MB

- Estimated disk space required: 142 MB (with tests)

- Estimated build time: 0.4 SBU (using parallelism=4; with tests)

### BlueZ Dependencies

#### Required

dbus-1.12.20, GLib-2.70.4, and libical-3.0.14

#### Optional

docutils-0.18.1 (to generate man pages)

User Notes: https://wiki.linuxfromscratch.org/blfs/wiki/bluez

## Kernel Configuration

If you are building this package to use bluetooth devices (rather than as a build dependency), enable the following options in the kernel configuration, also the options below the next paragraph if you intend to run the tests, and recompile the kernel if necessary:

    General Setup --->
      [*] Configure standard kernel features (expert users)               [CONFIG_EXPERT]
        [*] Enable timerfd() system call               [CONFIG_TIMERFD]
        [*] Enable eventfd() system call               [CONFIG_EVENTFD]

    [*] Networking support --->                [CONFIG_NET]
      <*/M> Bluetooth subsystem support --->    [CONFIG_BT]
        <*/M> RFCOMM protocol support          [CONFIG_BT_RFCOMM]
        [*]   RFCOMM TTY support               [CONFIG_BT_RFCOMM_TTY]
        <*/M> BNEP protocol support            [CONFIG_BT_BNEP]
        [*]   Multicast filter support         [CONFIG_BT_BNEP_MC_FILTER]
        [*]   Protocol filter support          [CONFIG_BT_BNEP_PROTO_FILTER]
        <*/M> HIDP protocol support            [CONFIG_BT_HIDP]
            Bluetooth device drivers --->
              (Select the appropriate drivers for your Bluetooth hardware)

       <*/M> RF switch subsystem support ----   [CONFIG_RFKILL]

    -*- Cryptographic API --->
       <*/M*> User-space cryptographic algorithm configuration         [CONFIG_CRYPTO_USER]
       <*/M*> User-space interface for hash algorithms                 [CONFIG_CRYPTO_USER_API_HASH]
       <*/M*> User-space interface for symmetric key cipher algorithms [CONFIG_CRYPTO_USER_API_SKCIPHER]
       <*/M*> MD5 digest algorithm                                     [CONFIG_CRYPTO_MD5]
       <*/M*> SHA1 digest algorithm                                    [CONFIG_CRYPTO_SHA1]

    Security Options --->
      <*/M*> Diffie-Hellman operations on retained keys [CONFIG_KEY_DH_OPERATIONS]

## Installation of BlueZ

Install BlueZ by running the following commands:

    ./configure --prefix=/usr         \
                --sysconfdir=/etc     \
                --localstatedir=/var  \
                --disable-manpages    \
                --enable-library      &&
    make

To test the results, issue: `make check`.

Now, as the `root` user:

    make install &&
    ln -svf ../libexec/bluetooth/bluetoothd /usr/sbin

Install the main configuration file as the `root` user:

    install -v -dm755 /etc/bluetooth &&
    install -v -m644 src/main.conf /etc/bluetooth/main.conf

If desired, install the API documentation as the `root` user:

    install -v -dm755 /usr/share/doc/bluez-5.63 &&
    install -v -m644 doc/*.txt /usr/share/doc/bluez-5.63

## Command Explanations

`--disable-manpages`: This switch disables generating the manual pages because of the reliance on 'rst2man' in docutils. Remove this switch if you have docutils-0.18.1 installed and wish to generate the manual pages.

`--enable-library`: This switch enables building the BlueZ 4 compatibility library which is required by some applications.

ln -svf ../libexec/bluetooth/bluetoothd /usr/sbin: This command makes access to the bluetooth daemon more convenient.

## Configuring BlueZ

###

#### Configuration Files

`/etc/bluetooth/main.conf` is installed automatically during the installation. Additionally, there are two supplementary configuration files. You can optionally install the following files as the `root` user:

    cat > /etc/bluetooth/rfcomm.conf << "EOF"
    # Start rfcomm.conf
    # Set up the RFCOMM configuration of the Bluetooth subsystem in the Linux kernel.
    # Use one line per command
    # See the rfcomm man page for options

    # End of rfcomm.conf
    EOF

    cat > /etc/bluetooth/uart.conf << "EOF"
    # Start uart.conf
    # Attach serial devices via UART HCI to BlueZ stack
    # Use one line per device
    # See the hciattach man page for options

    # End of uart.conf
    EOF

###

#### Systemd Bluez Services

To start the bluetoothd daemon at boot, enable the previously installed systemd unit by running the following command as the `root` user:

    systemctl enable bluetooth

To start the obexd daemon for a user session (to support some Bluetooth programs using it), enable the previously installed systemd unit for all users by running the following command as the `root` user:

    systemctl enable --global obex

### Note

Systemd will start the Bluetooth daemon only when a bluetooth device is detected on the system.

## Contents

Installed Programs: bluemoon, bluetoothctl, bluetoothd (symlink), btattach, btmon, hex2hcd, l2ping, l2test, mpris-proxy, and rctest
Installed Library: libbluetooth.so
Installed Directories: /etc/bluetooth, /usr/{include,libexec}/bluetooth, and /usr/share/doc/bluez-5.63

### Short Descriptions

bluemoon | is a Bluemoon configuration utility
bluetoothctl | is the interactive Bluetooth control program
bluetoothd | is the Bluetooth daemon
btmon | provides access to the Bluetooth subsystem monitor infrastructure for reading HCI traces
hex2hcd | is used to convert a file needed by Broadcom devices to hcd (Broadcom bluetooth firmware) format
l2ping | is used to send a L2CAP echo request to the Bluetooth MAC address given in dotted hex notation
l2test | is a L2CAP testing program
rctest | is used to test RFCOMM communications on the Bluetooth stack
`libbluetooth.so` | contains the BlueZ 4 API functions

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