Bluetooth

Bluetooth

Bluetooth is a wireless technology standard for exchanging data over short distances. It is using short-wavelength UHF radio waves in the ISM band from 2.4 to 2.485 GHz. It was developed by Ericsson in 1994. Today it is used mostly to connect peripherals and smartphones to your computer.

Kernel configuration

• Enable these options in your kernel:

[*] Networking support --->
     <M>   Bluetooth subsystem support --->
             [*]    Bluetooth Classic (BR/EDR) features
             <M>   RFCOMM protocol support
             [*]     RFCOMM TTY support
             <M>   BNEP protocol support
             [*]     Multicast filter support
             [*]     Protocol filter support
             <M>   CMTP protocol support
             <M>   HIDP protocol support
             [*]    Bluetooth Low Energy (LE) features
             <M> Bluetooth 6LoWPAN support
             [*]   Export Bluetooth internals in debugfs
                   Bluetooth device drivers --->
                     <M> HCI USB driver
                     <M> HCI UART driver
     <M>   RF switch subsystem support --->

Software

• Add these use-flags into your package.use:
• app-mobilephone/obexftp bluetooth

 root# echo "app-mobilephone/obexftp bluetooth" >> /etc/portage/package.use

• dev-libs/openobex bluetooth

 root# echo "dev-libs/openobex bluetooth" >> /etc/portage/package.use

Additionally you can globally enable bluetooth use flag in your make.conf, but this is not required. Dont forget to run emerge -uDN @world if you enable bluetooth use flag globally. file /etc/portage/make.conf:

 USE="bluetooth"

You need to install these packages:

• net-wireless/bluez

 root# emerge bluez

• sys-fs/obexfs

 root# emerge obexfs

• add your user to plugdev group:

 root# gpasswd -a user plugdev

Bluetooth Service

• add bluetooth service to default runlevel:

 rc-update add bluetooth default

• start bluetooth service:

 rc-service bluetooth start

Controller Setup

To connect to Bluetooth device, it needs to be:

• visible (temporarily)
• trusted
• paired.

Bluetooth devices are not visible by default, therefore if you want to connect to your phone, you need to set it (temporarily) into visible mode.

• execute following command as ordinary user:

 user# bluetoothctl

• description of commands inside bluetoothctl:
• to get help

 help

• List available controllers

 list

• Set "power on" on your controller

 power on

• Set controller into pairable mode

 pairable on

• Set controller into discoverable mode

 discoverable on

• Scan for devices

 scan on

• • this will display DEVICE_MAC_Adrress and name of a device that is in visible mode (and in range of your Bluetooth antena)

• List available devices

 devices

• • display devices that vere "scanned" with "scan on" command

• Trust device

 trust DEVICE_MAC_Address

• Pair device

 trust DEVICE_MAC_Address

Obexfs

• mount Bluetooth device into your users ~/bluetooth directory

 user# obexfs -b DEVICE_MAC_Address ~/bluetooth

Scripting the whole process

• You can use bluetoothctl from inside a script, by "piping" a command into it;

bluetooth_mount.sh script:

1. !/bin/bash

echo "power on"| bluetoothctl; obexfs -b DEVICE_MAC_Address ~/bluetooth;

bluetooth_unmount.sh script:

1. !/bin/bash

fusermount -u ~/bluetooth; echo "power off"| bluetoothctl;