Bluetooth keyboard
This article describes how to set up a Bluetooth HID keyboard with Arch Linux, bluez version 5.
Contents
Pairing process
Login to the affected computer by a wired keyboard or by ssh.
First, make sure the local BT controller (e.g. a BT dongle the built in BT radio) is recognized:
# lsusb
Bus 001 Device 004: ID 0a12:0001 Cambridge Silicon Radio, Ltd Bluetooth Dongle (HCI mode) Bus 001 Device 003: ID 0424:ec00 Standard Microsystems Corp. SMSC9512/9514 Fast Ethernet Adapter Bus 001 Device 002: ID 0424:9512 Standard Microsystems Corp. LAN9500 Ethernet 10/100 Adapter / SMSC9512/9514 Hub Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
The above output is from a Raspberry-Pi revision 'B' with archlinux-arm and a Keysonic BT Dongle.
Three items worth remembering:
- BT devices (keyboard) and controllers (dongle) need to be paired once.
- The BT controller needs to be powered up after every boot.
- The BT controller needs to be told to connect to the keyboard after every boot.
Pairing is a one time process, required only once. There are BT keyboards sold with a BT dongle which come already paired, but that's not certain. We will use the bluetoothctl
command from bluez-utils to pair our dongle and the keyboard.
Power up can be done with bluetoothctl
, or automatically in /etc/bluetooth/main.conf
, see below.
Same for connecting, either bluetoothctl
or hcitool
can be used, the latter is more useful for scripting.
We will use bluetoothctl
for the pairing process. Run the command to get at the [bluetooth]#
prompt.
# bluetoothctl
[bluetooth]#
While in bluetoothctl power up the controller:
[bluetooth]# power on
Changing power on succeeded [CHG] Controller 06:05:04:03:02:01 Powered: yes
Next, tell bluetoothctl
to look only for keyboards, and make that the default agent:
[bluetooth]# agent KeyboardOnly
Agent registered
[bluetooth]# default-agent
Default agent request successful
Next, put your controller (the local dongle) in pairable mode:
[bluetooth]# pairable on
Changing pairable on succeeded
Next, put your keyboard in an active mode, where it is discoverable, i.e. pairable. Some keyboards have a special button for this on the underside, or require a special key combination to be pressed. See the documentation of your keyboard. Please note that this discoverability of a device is time limited, some devices are only visible 30 seconds, other for 2 minutes. Your mileage may vary.
Next, let the controller scan the BT frequencies for a suitable device:
[bluetooth]# scan on
Discovery started [CHG] Controller 06:05:04:03:02:01 Discovering: yes
After a few seconds the adress of the keyboard should be listed as found. This line will repeat over and over, but won't stop you from entering new commands.
Next, actually do the pairing. The address used is the BT-MAC address of the keyboard:
[bluetooth]# pair 01:02:03:04:05:06
Pairing successful
Next, make this a trusted device (this allows the device to establish the connection on itself). Again, the BT-MAC address is the address of the keyboard device:
[bluetooth]# trust 01:02:03:04:05:06
Trusted
Next and finally connect to the device (keyboard). Again, the BT-MAC address is the address of the keyboard device:
[bluetooth]# connect 01:02:03:04:05:06
Connection successful
Done. Leave the bluetoothctl
utility:
[bluetooth]# quit
Now the external device (i.e. keyboard) and the USB BT dongle are paired permanently, unless you break the pairing intentionally. This does not mean that the keyboard will connect automatically to your BT device after a boot. This is mainly due to the fact that the bluetooth controller will be automatically turned off after each reboot. To automatically connect the keyboard after a reboot, see Bluetooth#Auto power-on after boot.
Legacy method for auto-connect
Before Bluez added the feature to automatically power on the bluetooth controller after a reboot, it was necessary to run two commands manually or automatically via a systemd service or a udev rule to Power up the controller and connect device and controller. In the following, those legacy methods are demonstrated if the new method yields any problems.
Manually enabling a Bluetooth Keyboard
Although the device and the controller are now paired (see above), you need to connect them every time the computer starts.
First the BT controller (i.e. BT Dongle) needs to be powered up. This is done with the hciconfig
utility. We assume that you have only one BT device connected, and this one has the symbolic name hci0
.
# hciconfig hci0 up
Next, make the connection, now using the hcitool
utility. Make sure that the keyboard is powered up and connectable, i.e. not in a power saving sleep state.
# hcitool cc 01:02:03:04:05:06
Your BT keyboard should be useable now, even if an error message ("Can't create connection: Input/output error") is shown. Next we will discuss how to automate this process with systemd.
Automatically enabling a Bluetooth Keyboard
Remember that you have to pair and trust your device in bluetoothctl to cause autoconnect. Then you can power up your adapter automatically in several ways:
Custom systemd service file:
Create a config file /etc/btkbd.conf
# Config file for btkbd.service # change when required (e.g. keyboard hardware changes, more hci devices are connected) BTKBDMAC = ''mac_address_of_your_device'' HCIDEVICE = ''hci_device_identifier''
mac_address_of_your_device
can be found with the scan on
command of the bluetoothctl utility.
hci_device_identifier
can be found with:
# hcitool dev
Devices: hci0 06:05:04:03:02:01
We are looking for the identifier hci0
in this case. The MAC address shown here is the address of the controller, not the address of the keyboard itself.
Next, create a new service file at /etc/systemd/system/btkbd.service
.
[Unit] Description=systemd Unit to automatically start a Bluetooth keyboard Documentation=https://wiki.archlinux.org/index.php/Bluetooth_Keyboard ConditionPathExists=/etc/btkbd.conf ConditionPathExists=/usr/local/bin/hcitool ConditionPathExists=/usr/local/sbin/hciconfig [Service] Type=oneshot EnvironmentFile=/etc/btkbd.conf ExecStart= ExecStart=/usr/local/sbin/hciconfig ${HCIDEVICE} up # ignore errors on connect, spurious problems with bt? so start next command with - ExecStart=-/usr/local/bin/hcitool cc ${BTKBDMAC} [Install] WantedBy=bluetooth.target
And then enable this service with systemd's tools.
Or udev rule:
Create new file /etc/udev/rules.d/10-local.rules
# Set bluetooth power up ACTION=="add", KERNEL=="hci0", RUN+="/usr/bin/hciconfig hci0 up"
Troubleshooting
What if the BT controller does not show up in lsusb
?
- Load generic bluetooth driver:
# modprobe btusb
- Is it an USB adapter or integral to the system? Use
lspci
for integral adapters
What if the BT controller is not visible in bluetoothctl
?
- Check:
bluetoothctl
is started:
systemctl status bluetooth
- Check: You run the command with superuser privileges using
su
orsudo
. Otherwise you have blue [bluetooth]# prompt and get the following message when powering on the controller:
[bluetooth]# power on No default controller available
My BT keyboard still does not work. What to do?
- Check: Does it have power?
- Check: Did it connect to the BT controller? If not, try with another controller or your smart phone.
All went fine but when I type I'm getting "Bluetooth: hci0 ACL packet for unknown connection handle 4"
- Try reset: hciconfig hci0 reset
Xorg
Device should be added as /dev/input/event*
and your Xorg should add it automatically if you did not disable such feature.