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Raspberry Pi3 の Bluetooth を Ubuntu Mate 16.04 LTS で使えるようにする

Last updated at Posted at 2016-12-28

Overview

Raspberry Pi3 で Bluetooth を使おうとすると、意外とはまったので、そのまとめ。

$ sudo dmesg | grep -i blue
[  711.501303] Bluetooth: Core ver 2.20
[  711.505882] Bluetooth: HCI device and connection manager initialized
[  711.505899] Bluetooth: HCI socket layer initialized
[  711.505909] Bluetooth: L2CAP socket layer initialized
[  711.505931] Bluetooth: SCO socket layer initialized

のように出ているのに、

$ sudo hciconfig up
Can't get device info: No such device
$ sudo bluetoothctl
[bluetooth]# 

のまますすまないときに、この解決方法が役に立つかもです。

また、このとき、

sudo systemctl status bluetooth
● bluetooth.service - Bluetooth service
   Loaded: loaded (/lib/systemd/system/bluetooth.service; enabled; vendor preset: enabled)
   Active: inactive (dead)
Condition: start condition failed
           ConditionPathIsDirectory=/sys/class/bluetooth was not met
     Docs: man:bluetoothd(8)

のように、inactiveでもあるはずです。

対処方法

Bluetooth系のmoduleのinstall

$ sudo apt-get update
$ sudo apt-get install bluetooth bluez blueman -y 
$ sudo apt-get install bluez-btsco bluez-dbg bluez-hcidump bluewho indicator-bluetooth -y

Raspberry Pi3のfirmwareのupdate

$ sudo apt-get install rpi-update -y
$ sudo rpi-update
$ sudo reboot

rpi-updateでは、以下のようなメッセージが出ると思います.

 *** Raspberry Pi firmware updater by Hexxeh, enhanced by AndrewS and Dom
 *** Performing self-update
 *** Relaunching after update
 *** Raspberry Pi firmware updater by Hexxeh, enhanced by AndrewS and Dom
 *** We're running for the first time
 *** Backing up files (this will take a few minutes)
 *** Backing up firmware
 *** Backing up modules 4.1.18-v7+
This update bumps to rpi-4.4.y linux tree
Be aware there could be compatibility issues with some drivers
Discussion here:
https://www.raspberrypi.org/forums/viewtopic.php?f=29&t=144087
##############################################################
 *** Downloading specific firmware revision (this will take a few minutes)
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100   168    0   168    0     0    106      0 --:--:--  0:00:01 --:--:--   106
100 51.8M  100 51.8M    0     0   730k      0  0:01:12  0:01:12 --:--:-- 1156k
 *** Updating firmware
 *** Updating kernel modules
 *** depmod 4.4.38-v7+
 *** depmod 4.4.38+
 *** Updating VideoCore libraries
 *** Using HardFP libraries
 *** Updating SDK
 *** Running ldconfig
 *** Storing current firmware revision
 *** Deleting downloaded files
 *** Syncing changes to disk
 *** If no errors appeared, your firmware was successfully updated to af9cb14d5053f89857225bd18d1df59a089c171e
 *** A reboot is needed to activate the new firmware

pi-bluetooth

http://ppa.launchpad.net/ubuntu-pi-flavour-makers/ppa/ubuntu

http://kakurasan.blogspot.jp/2015/04/how-to-add-ppa-repository.html
などを参考に、Ubuntu software centerなどで、ちゃんと有効になっているか確認しましょう。
(Updateのタイミングで無効になっていることも。。。)

$ sudo apt-get install pi-bluetooth

上などが有効になっていないとできないようです。

bluetooth serviceの起動

$ sudo systemctl start bluetooth
$ sudo systemctl status bluetooth
● bluetooth.service - Bluetooth service
   Loaded: loaded (/lib/systemd/system/bluetooth.service; enabled; vendor preset: enabled)
   Active: active (running)
     Docs: man:bluetoothd(8)
 Main PID: 2327 (bluetoothd)
   Status: "Running"
   CGroup: /system.slice/bluetooth.service
           └─2327 /usr/lib/bluetooth/bluetoothd

systemd[1]: Starting Bluetooth service...
bluetoothd[2327]: Bluetooth daemon 5.37
systemd[1]: Started Bluetooth service.
bluetoothd[2327]: Starting SDP server
bluetoothd[2327]: Bluetooth management interface 1.10 initialized

rfkillでのunblock化

$ sudo rfkill unblock bluetooth
$ sudo hciconfig hci0 up

agentの有効化

$ sudo bluetoothctl
[bluetooth]# agent on
Agent registered
[bluetooth]# default-agent
Default agent request successful
[bluetooth]# scan on
[bluetooth]# exit

how to fix bluetoothd saying "not enough free handles..."

上のようにすると、$ sudo systemctl status bluetooth
してみると、エラーが出て起動できていないことがあるかと思います。

そのときは、

$ sudo apt-get install indicator-bluetooth

を再度実施したり、

/lib/systemd/system/bluetooth.service

-ExecStart=/usr/lib/bluetooth/bluetoothd
+ExecStart=/usr/lib/bluetooth/bluetoothd -E -d

のように、起動scriptを書き換えてみてください。

で、

$ sudo bluetoothctl
[Bluetooth] agent on
[Bluetooth] default-agent
[Bluetooth] scan on

で、ちゃんとしたmac addressが帰ってくればOkです。

やっと、これで、bluetoothを使ったhackの開発に入れる・・・。

それではenjoy bluetooth on Raspberry Pi3 with Ubuntu Mate 16.04 LTS!

ちなみに、Raspberry Pi3のUARTを使う方は以下のおまじないもしておいたほうが良いみたいです。

/boot/config.txt
core_freq=250

昨今のupdateで、なぜかhci0がupされていないようです。

/lib/systemd/system/bluetooth.service
[Service]
Type=dbus
BusName=org.bluez
+ExecStartPre=/usr/sbin/rfkill unblock bluetooth
+ExecStartPre=/usr/bin/hciconfig hci0 up
ExecStart=/usr/lib/bluetooth/bluetoothd

ExecStartPreをすれば以下は不要だが、ダメな場合は以下を。。。

/etc/rc.local
rfkill unblock bluetooth
/bin/hciconfig hci0 up

SAP (Sim Access Profile) の load で error する件 の 暫定対処

$ systemctl status bluetooth
● bluetooth.service - Bluetooth service
   Loaded: loaded (/lib/systemd/system/bluetooth.service; enabled; vendor preset: enabled)
   Active: active (running)
     Docs: man:bluetoothd(8)
 Main PID: 1316 (bluetoothd)
   Status: "Running"
   CGroup: /system.slice/bluetooth.service
           └─1316 /usr/lib/bluetooth/bluetoothd

..snip..
bluetoothd[1316]: Sap driver initialization failed.
sap-server: Operation not permitted (1)

の対処方法

/lib/systemd/system/bluetooth.service
-ExecStart=/usr/lib/bluetooth/bluetoothd
+ExecStart=/usr/lib/bluetooth/bluetoothd --noplugin=sap
$ sudo systemctl daemon-reload
$ systemctl status bluetooth

のようにして、そもそも非サポートにする・・・どうせ動かないので、読み込まない方がマシ。。。

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