Add tutorial: setting-up Bluetooth - PulseAudio

docs/tutorials/setting-up-bluetooth-audio-with-pulseaudio.md

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+---
+title: Setting Up Bluetooth audio with PulseAudio - A2DP only
+subject: Bluetooth
+---
+
+### Overview
+
+Debian jessie is using BlueZ 5 and PluseAudio 5, which are fairly new.
+There were major breaking changes in these versions.
+Most stuff you find on the Internet will be for BlueZ 4 and PulseAudio 4,
+so watch out, those configurations may not work.
+
+
+[PulseAudio 5 only supports the A2DP profile][PA5-relnotes] and not Headset profile (HSP) or Hands-free profile (HFP),
+although it is [under development][basic support for HEADSET profiles].
+
+PulseAudio provides these two profiles:
+
+    UUID: Audio Source
+    UUID: Audio Sink
+
+The remote device we are connecting to needs to have at least one of these profiles.
+
+### How to get PulseAudio working with Bluetooth
+
+**This should almost all be done as root**
+
+1. Install pulseaudio:
+
+        apt-get install --no-install-recommends pulseaudio pulseaudio-module-bluetooth
+
+2. Create a systemd service for running pulseaudio as the pulse user.
+Save the following lines as `/etc/systemd/system/pulseaudio.service`
+
+        [Unit]
+        Description=Pulse Audio
+
+        [Service]
+        Type=simple
+        ExecStart=/usr/bin/pulseaudio --system --disallow-exit --disable-shm
+
+    and reload systemd with
+
+        systemctl daemon-reload
+
+3. Give the `pulse` user permission to use Bluetooth.
+Save the following lines to `/etc/dbus-1/system.d/pulseaudio-bluetooth.conf`
+
+        <busconfig>
+
+          <policy user="pulse">
+            <allow send_destination="org.bluez"/> 
+          </policy>
+
+        </busconfig>
+
+4. Paste the following lines to the **end** of `/etc/pulse/system.pa`:
+
+        ### Automatically load driver modules for Bluetooth hardware
+        .ifexists module-bluetooth-policy.so
+        load-module module-bluetooth-policy
+        .endif
+        .ifexists module-bluetooth-discover.so
+        load-module module-bluetooth-discover
+        .endif
+
+5. Start the systemd service: `systemctl start pulseaudio.service`
+
+6. Connect the device, example using brickman on the EV3 screen.
+You only need to do the pairing stuff once.
+
+    Actions to do:
+
+    On the brickman main screen scroll to the `Bluetooth` option:
+
+    {% include screenshot.html source="/images/brickman/main-menu-incl-bluetooth.png" scale="50" %}
+
+    Press the EV3 "ENTER" button (the center button). 
+    Scroll with the up or down button to `Start Scan` and press "ENTER"
+
+    {% include screenshot.html source="/images/brickman/bluetooth-start-scan.png" scale="50" %}
+
+    Did you set the target device "discoverable"? If not, better do that now.
+
+    Scroll down (or up if you like) to the device you want to use.
+    Press "ENTER" to select:
+
+    {% include screenshot.html source="/images/brickman/bluetooth-select-device.png" scale="50" %}
+
+    On the brickman device page:
+    Select `Pair` and press "ENTER"
+
+    {% include screenshot.html source="/images/brickman/bluetooth-before-pair.png" scale="50" %}
+
+    On the remote device you also need to accept the pairing.
+
+    Select `Accept` and press "ENTER"
+
+    {% include screenshot.html source="/images/brickman/bluetooth-accept-pairing.png" scale="50" %}
+
+    After successful pairing select `Connect` and press "ENTER":
+
+    {% include screenshot.html source="/images/brickman/bluetooth-after-pair.png" scale="50" %}
+
+    If all went well (no error seen on the EV3) the screen looks like:
+
+    {% include screenshot.html source="/images/brickman/bluetooth-after-connect.png" scale="50" %}
+
+7. Now, you should be able to play sound from a remote device on your EV3 without any further configuration.
+
+8. To play sound from the EV3 on a remote device, there are a few more steps.
+    * add your own non-root user(s) to the `audio` and `pulse-access` groups:
+
+            usermod -a -G pulse-access,audio myuser
+
+    * **Starting here** run the commands as `myuser`: 
+
+            pactl list cards
+
+        The end of the output should look something like this:
+
+            Card #2
+                    Name: bluez_card.B4_74_9F_D1_51_A1
+                    Driver: module-bluez5-device.c
+                    Owner Module: 16
+                    Properties:
+                            device.description = "MUMBA"
+                            device.string = "B4:74:9F:D1:51:A1"
+                            device.api = "bluez"
+                            device.class = "sound"
+                            device.bus = "bluetooth"
+                            bluez.path = "/org/bluez/hci0/dev_B4_74_9F_D1_51_A1"
+                            bluez.class = "0x3e010c"
+                            bluez.alias = "MUMBA"
+                            device.icon_name = "audio-card-bluetooth"
+                    Profiles:
+                            a2dp_source: High Fidelity Capture (A2DP Source) (sinks: 0, sources: 1, priority: 10, available: yes)
+                            a2dp: High Fidelity Playback (A2DP Sink) (sinks: 1, sources: 0, priority: 10, available: yes)
+                            off: Off (sinks: 0, sources: 0, priority: 0, available: yes)
+                    Active Profile: off
+                    Ports:
+                            unknown-output: Bluetooth Output (priority: 0, latency offset: 0 usec)
+                                    Part of profile(s): a2dp
+                            unknown-input: Bluetooth Input (priority: 0, latency offset: 0 usec, not available)
+                                    Part of profile(s): a2dp_source
+
+    The active profile probably doesn't say `a2dp`.
+    So set it by running:
+
+            pactl set-card-profile 2 a2dp
+
+    The "2" in this command is the number of the BT card from the output above.
+
+9. Now you can play sound using paplay.
+Look at the name of the sink with:
+
+        pactl list sinks
+
+    Playback example:
+
+        paplay -d bluez_sink.B4_74_9F_D1_51_A1 /usr/share/sounds/alsa/Front_Center.wav
+
+    Using my simple non-root user I get messages that are not yet explained:
+
+        xcb_connection_has_error() returned true
+        Failed to create secure directory (/run/user/0/pulse): Permission denied
+
+    but playback **does** work.
+    There seems to be no ill effect on BT audio.
+
+
+
+[PA5-relnotes]: http://www.freedesktop.org/wiki/Software/PulseAudio/Notes/5.0/
+[basic support for HEADSET profiles]: http://cgit.freedesktop.org/pulseaudio/pulseaudio/commit/?id=1f0de01bfc85f92785fcd2f0e863e471af7e6ace
+

docs/tutorials/setting-up-bluetooth-keyboard.md

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+---
+title: Setting Up Bluetooth keyboard
+subject: Bluetooth
+---
+
+### Needs to be created