檢視Bluetooth keyboard auto connect的原始碼

== Find keyboard & device MAC ==
<pre>
#hcitool scan
Scanning ...
    23:E4:87:4C:B3:A1       Wireless Keyboard

# hcitool dev
Devices:
   hci0   06:05:04:03:02:01
</pre>

== Paring ==
<pre>
#bluez-simple-agent hci0 23:E4:87:4C:B3:A1

If everything goes well, you will be prompted to type a passkey with your keyboard:
DisplayPasskey (/org/bluez/14656/hci0/dev_23_E4_87_4C_B3_A1, 936319)
Your passkey is the number at the end of the line. Don’t forget to press ‘Enter’ after typing the passcode! Now your device is paired with the Raspberry Pi.
</pre>

== Trusting & Connecting ==
<pre>
The final stage is making sure that the raspberry will automatically connect to the keyboard when it is turned on. This is called ‘trusting’ and is invoked by this command:
#bluez-test-device trusted 23:E4:87:4C:B3:A1 yes

After trusing it, all you need to do is connect to it:
#bluez-test-input connect 23:E4:87:4C:B3:A1 yes
</pre>

== Automative connecting with systemd ==
==== /etc/btkbd.conf ====
<pre>
# Config file for btkbd.service
# change when required (e.g. keyboard hardware changes, more hci devices are connected)
BTKBDMAC = 6C:5D:63:22:0B:05
HCIDEVICE = 00:1A:7D:DA:71:13
</pre>

==== /etc/systemd/system/btkbd.service ====
<pre>
[Unit]
Description=systemd Unit to automatically start a Bluetooth keyboard
Documentation=https://wiki.archlinux.org/index.php/Bluetooth_Keyboard
Requires=dbus-org.bluez.service
After=dbus-bluez.org.service
ConditionPathExists=/etc/btkbd.conf
ConditionPathExists=/usr/bin/hcitool
ConditionPathExists=/usr/sbin/hciconfig

[Service]
Type=oneshot
EnvironmentFile=/etc/btkbd.conf
ExecStart=-/usr/sbin/hciconfig ${HCIDEVICE} up
# ignore errors on connect, spurious problems with bt? so start next command with -
ExecStart=-/usr/bin/hcitool cc ${BTKBDMAC}
</pre>

== reference ==
*[https://wiki.archlinux.org/index.php/bluetooth_keyboard Bluetooth keyboard]
*[http://www.correlatedcontent.com/blog/bluetooth-keyboard-on-the-raspberry-pi/ Bluetooth Keyboard on the Raspberry Pi]

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