Raspberry Pi setup as bluetooth speaker

pis/01-download-and-prepare-raspi-image.yml

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+# Run with
+# ansible-playbook pis/download-and-prepare-raspi-image.yml
+---
+
+- hosts: 127.0.0.1
+  connection: local
+  gather_facts: false
+  vars:
+    target_folder: "/media/martin/data_linux/tmp/"
+  vars_prompt:
+    - name: "ansible_become_pass"
+      prompt: "Sudo password to mount raspi image"
+    - name: "new_hostname"
+      prompt: "New hostname for the PI"
+      private: no
+  tasks:
+    # --- Preparation ---
+    - name: Download Raspian image
+      get_url:
+        url: "https://downloads.raspberrypi.org/raspbian_lite_latest"
+        dest: "{{target_folder}}/raspian_lite_latest.zip"
+    - name: Unpack Image
+      unarchive:
+        src: "{{target_folder}}/raspian_lite_latest.zip"
+        dest:  "{{target_folder}}"
+        creates: "{{target_folder}}/*raspbian*.img"
+    - name: Make Folders to mount to
+      file:
+        path: "{{item}}"
+        state: directory
+      with_items:
+        - "{{target_folder}}/mounted_raspi_image"
+        - "{{target_folder}}/mounted_raspi_image/boot"
+        - "{{target_folder}}/mounted_raspi_image/system"
+    - name: Setup Loopback
+      become: true
+      shell:
+        cmd: "losetup -P /dev/loop42 {{target_folder}}/*raspbian*.img"
+        creates: "/dev/loop42p1"
+    - name: Mount Boot Partition
+      become: true
+      shell:
+        warn: false
+        cmd: "mount /dev/loop42p1 {{target_folder}}/mounted_raspi_image/boot"
+        creates: "{{target_folder}}/mounted_raspi_image/boot/kernel.img"
+    - name: Mount System Partition
+      become: true
+      shell:
+        warn: false
+        cmd: "mount /dev/loop42p2 {{target_folder}}/mounted_raspi_image/system"
+        creates: "{{target_folder}}/mounted_raspi_image/system/bin"
+    # --- Actual work ---
+    - name: "Add SSH File to boot partition to allow for first remote login"
+      become: true
+      file:
+        path: "{{target_folder}}/mounted_raspi_image/boot/ssh"
+        state: touch
+    - name: "Writing new hostname to /etc/hostname"
+      become: true
+      copy:
+        content: "{{new_hostname}}"
+        dest: "{{target_folder}}/mounted_raspi_image/system/etc/hostname"
+    # --- Wind-down
+    - name: Unmount System Partition
+      become: true
+      shell:
+        warn: false
+        cmd: "umount /dev/loop42p2"
+        removes: "{{target_folder}}/mounted_raspi_image/system/bin"
+    - name: Unmount Boot Partition
+      become: true
+      shell:
+        warn: false
+        cmd: "umount /dev/loop42p1"
+        removes: "{{target_folder}}/mounted_raspi_image/boot/kernel.img"
+    - name: Tear down loop device
+      become: true
+      shell:
+        cmd: "losetup -d /dev/loop42"
+        removes: "/dev/loop42p1"
+    - name: Remove folders
+      file:
+        path: "{{item}}"
+        state: absent
+      with_items:
+        - "{{target_folder}}/mounted_raspi_image"
+        - "{{target_folder}}/mounted_raspi_image/boot"
+        - "{{target_folder}}/mounted_raspi_image/system"
+        - "{{target_folder}}/raspian_lite_latest.zip"
+    - name: Final Image
+      debug: |
+        The prepared image is ready at {{target_folder}}.
+        Copy it to sdcard with
+        dd bs=4M if=the_image of=/dev/your/sdcard

pis/02-provision_new_pi.yml

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+# Run with
+# ansible-playbook -i raspberrypi, 02-provision_new_pi.yml
+# where "raspberrypi" is the hostname of the pi
+---
+
+- hosts: all
+  gather_facts: false
+  vars:
+    timezone: "Europe/Berlin"
+    wifi_country: "DE"
+    wifi_ssid: "" # put SSID here to configure wifi
+    wifi_pass_url: "bauer_wifi"  # has to be in keepass with url "wifi_pass_url"
+    ansible_ssh_pass: raspberry
+    ansible_become: yes
+    ansible_become_password: raspberry
+    new_hostname: "" # set this to change the hostname
+  vars_prompt:
+    - name: ansible_user
+      prompt: "User to connect with, put in 'pi' here if you connect the first time, else leave empty"
+      default: root
+  tasks:
+    - name: Do apt update/upgrade
+      apt:
+        upgrade: yes
+        update_cache: yes
+        cache_valid_time: 7200
+    - name: Detect Raspi Model
+      slurp: src=/sys/firmware/devicetree/base/model
+      register: raspberry_model
+    - name: Show Raspi Model
+      debug: msg={{ raspberry_model.content | b64decode }}
+    - name: Add authorized SSH key to root account
+      authorized_key:
+        user: root
+        key: "{{ lookup('file', '../public_keys/martin_laptop.pub') }}"
+        state: present
+    - name: Activate root login with key
+      lineinfile:
+        path: /etc/ssh/sshd_config
+        regexp: "^#?PermitRootLogin"
+        line: "PermitRootLogin prohibit-password"
+      notify: restart sshd
+    - name: Deactive SSH accepting locale vars (leads to warnings)
+      lineinfile:
+        path: /etc/ssh/sshd_config
+        regexp: "^#?AcceptEnv LANG LC_*"
+        line: "#AcceptEnv LANG LC_*"
+      notify: restart sshd
+    - name: Get hostname
+      command: "raspi-config nonint get_hostname"
+      register: pi_hostname
+      changed_when: False
+    - name: Change hostname to {{ new_hostname }}
+      command: "raspi-config nonint do_hostname {{ new_hostname }}"
+      when: new_hostname | bool and pi_hostname.stdout != new_hostname
+    - name: set boot mode to CLI
+      command: "raspi-config nonint do_boot_behaviour B1"
+    #I2 Change Timezone
+    - name: Change timezone
+      command: "raspi-config nonint do_change_timezone {{ timezone }}"
+    - name: Change locale
+      command: "raspi-config nonint do_change_locale en_US.UTF-8"
+    - name: Change password of default pi account
+      user:
+        name: pi
+        update_password: always
+        password: "{{ lookup('keepass', 'default_rpi_password') | password_hash('sha512')  }}"
+    - name: Install Packages (vim, git, basic python stuff)
+      apt:
+        name:
+          - vim
+          - git
+          - python3
+          - python3-pip
+          - python3-wheel
+        cache_valid_time: 7200
+        state: present
+    - name: Copy vim config
+      copy: src=../configs/vimrc dest=/root/.vimrc
+    - name: Copy git config
+      copy: src=../configs/gitconfig dest=/root/.gitconfig
+    # Wifi
+    - name: Get WiFi country
+      command: "raspi-config nonint get_wifi_country"
+      register: wifi_country
+      changed_when: False
+      ignore_errors: yes #to avoid error when WiFi is not present
+      when: wifi_ssid | bool
+    - name: Change WiFi country
+      command: "raspi-config nonint do_wifi_country {{ wifi_country }}"
+      when: wifi_ssid | bool
+    - name: Set WiFi credentials
+      command: "raspi-config nonint do_wifi_ssid_passphrase {{ wifi_ssid }} {{ lookup('keepass', wifi_pass_url) }}"
+      when: wifi_ssid | bool
+
+  handlers:
+    - name: restart sshd
+      service:
+        name: sshd
+        state: restarted
+
+

pis/03-install-pulseaudio-bluetooth.yml

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+# Run with
+# ansible-playbook -i raspberrypi, 03-install-pulseaudio-bluetooth.yml
+# where "raspberrypi" is the hostname of the pi
+---
+
+- hosts: all
+  gather_facts: false
+  remote_user: root
+  vars:
+    bluetooth_mac_address: B8:27:EB:AA:23:4E
+  vars_prompt:
+    - name: bluetooth_name
+      prompt: Name of Bluetooth device
+      private: no
+  tasks:
+    # --- Initial Checks ---
+    - name: Detect Raspi Model
+      slurp:
+        src: /sys/firmware/devicetree/base/model
+      register: raspberry_model
+    - name: Decode Raspi Model
+      set_fact:
+        raspi_model: "{{ raspberry_model.content | b64decode }}"
+    - name: Check if its a Raspberry 3 (where I've tested this)
+      fail:
+        msg: I've only tested this on Raspberry 3 Model Pi, this is something else
+      when: 'not raspi_model.startswith("Raspberry Pi 3 Model B Plus")'
+    #- name: Determine MAC Address of first Bluetooth device
+    #  command: 'hciconfig hci0'
+    #  register: hci_output
+    #- name: Extract MAC address
+    #  set_fact:
+    #    hci0_addr: "{{ hci_output.stdout | regex_search('BD Address: ([^\\s]+)', '\\1') | first }}"
+    # --- The actual work ---
+    - name: Install pulseaudio packages
+      apt:
+        name:
+          - pulseaudio
+          - pulseaudio-utils
+          - pulseaudio-module-bluetooth
+          - alsa-utils
+          - bluez-tools
+        cache_valid_time: 7200
+        state: present
+        install_recommends: no
+    - name: Add root to pulse-access group
+      user:
+        name: root
+        groups:
+          - pulse-access
+          - pulse
+          - audio
+        append: yes
+    - name: Copy DBus permission file
+      copy: src=dbus-pulseaudio-bluetooth.conf dest=/etc/dbus-1/system.d/pulseaudio-bluetooth.conf
+    - name: Copy Pulseaudio system-mode config file
+      copy: src=pulseaudio.cfg dest=/etc/pulse/system.pa
+    - name: Copy bluetoothd main.conf
+      copy: src=bluetooth_main.conf dest=/etc/bluetooth/main.conf
+    - name: Copy bluetoothd audio.conf
+      copy: src=bluetooth_audio.conf dest=/etc/bluetooth/audio.conf
+    - name: Copy bt-agent service file
+      template: src=bt-agent.service dest=/lib/systemd/system/bt-agent.service
+    - name: Copy pulseaudio service file
+      copy: src=pulseaudio.service dest=/lib/systemd/system/
+    - name: Copy Python script for discoverable and name setting
+      copy:
+        src: start_bt_discoverable.py
+        dest: /bin/start_bt_discoverable
+        mode: u=rwx,g=rx
+    #- name: Stop Bluetooth
+    #  service:
+    #    name: bluetooth
+    #    state: stopped
+    #- name: Set bluetooth device name
+    #  ini_file:
+    #    path: "/var/lib/bluetooth/{{hci0_addr}}/settings"
+    #    section: General
+    #    option: Alias
+    #    value: "{{bluetooth_name}}"
+    #- name: Mark as discoverable
+    #  ini_file:
+    #    path: "/var/lib/bluetooth/{{hci0_addr}}/settings"
+    #    section: General
+    #    option: Discoverable
+    #    value: true
+    - name: Enable and restart bluetooth
+      service:
+        name: bluetooth
+        enabled: yes
+        state: restarted
+    - name: Enable and restart pulseaudio
+      service:
+        name: pulseaudio
+        enabled: yes
+        state: restarted
+    - name: Enable and restart bt-agent
+      service:
+        name: bt-agent
+        enabled: yes
+        state: restarted
+        daemon_reload: yes

pis/bluetooth_audio.conf

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+# file goes into /etc/bluetooth/audio.conf
+# mostly default
+# but tried HFP=false and Headset=false to not be detected as "headset"
+
+[General]
+Enable=Source,Sink,Media,Socket
+HFP=false
+Headset=false
+Class=0x20041C

pis/bluetooth_main.conf

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+# file goes into /etc/bluetooth/main.conf
+
+[General]
+Class=0x20041C              # No idea - got this from the internet
+DiscoverableTimeout = 0     # stay discoverable and pairable forever
+PairableTimeout = 0
+
+[GATT]
+
+[Policy]
+AutoEnable=true  # was already in default config

pis/bt-agent.service

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+[Unit]
+Description=bt-agent to accept bluetooth connections without pin
+After=bluetooth.service
+RestartSec=3
+Restart=always
+
+
+[Service]
+Type=simple
+Restart=always
+RestartSec=1
+User=root
+# make first adaptor discoverable
+ExecStartPre=/bin/start_bt_discoverable {{bluetooth_mac_address}} {{bluetooth_name}}
+ExecStart=bt-agent -c NoInputNoOutput
+
+[Install]
+WantedBy=bluetooth.target

pis/dbus-pulseaudio-bluetooth.conf

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+# put this into: /etc/dbus-1/system.d/pulseaudio-bluetooth.conf
+
+ <busconfig>
+
+ <policy user="pulse">
+   <allow send_destination="org.bluez"/>
+ </policy>
+
+</busconfig>

pis/debmatic-install.yml

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+---
+
+- hosts: kitchenpi
+  tasks:
+    - name: Add Key for Debmatic Repository
+      apt_key:
+        url: https://www.debmatic.de/debmatic/public.key
+        state: present
+    - name: Add Debmatic Repository
+      repo: deb https://www.debmatic.de/debmatic stable main
+      state: present
+      filename: debmatic
+    - name: Install Pre-requesites
+      apt:
+        update_cache: yes
+        name:
+          - build-essential
+          - bison
+          - flex
+          - libssl-dev
+          - raspberrypi-kernel-headers
+          - pivccu-modules-dkms
+    - name: Reboot
+      reboot:
+    - name: Install Debmatic package
+      apt:
+        update_cache: no
+        name: debmatic

pis/knxd/how_to_build.md

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+KNXD
+----
+
+The following commands build knxd. Run these on the raspberry pi!
+After these commands *.deb files are in the created build_dir and should be copied back to this folder.
+
+```bash
+mkdir build_dir
+cd build_dir
+git clone https://github.com/knxd/knxd.git
+cd knxd
+git checkout stable
+apt-get install debhelper cdbs automake libtool libusb-1.0-0-dev git-core build-essential libsystemd-dev dh-systemd libev-dev cmake
+dpkg-buildpackage -b -uc
+```

pis/pulseaudio.cfg

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+#!/usr/bin/pulseaudio -nF
+#
+
+### Automatically restore the volume of streams and devices
+load-module module-device-restore
+load-module module-stream-restore
+load-module module-card-restore
+
+### Disabled: Automatically load driver modules depending on the hardware available
+#.ifexists module-udev-detect.so
+#load-module module-udev-detect tsched=0
+#.else
+### Use the static hardware detection module (for systems that lack udev/hal support)
+#load-module module-detect
+#.endif
+
+# this is used instead
+load-module module-alsa-card device_id=0
+# Parameters to try
+#   tsched=true tsched_buffer_size=1048576 tsched_buffer_watermark=262144
+
+
+
+### Load several protocols
+.ifexists module-esound-protocol-unix.so
+load-module module-esound-protocol-unix
+.endif
+# here I added anonymous logins from local system
+load-module module-native-protocol-unix auth-anonymous=1
+
+### Automatically restore the default sink/source when changed by the user
+### during runtime
+### NOTE: This should be loaded as early as possible so that subsequent modules
+### that look up the default sink/source get the right value
+load-module module-default-device-restore
+
+### Automatically move streams to the default sink if the sink they are
+### connected to dies, similar for sources
+load-module module-rescue-streams
+
+### Make sure we always have a sink around, even if it is a null sink.
+load-module module-always-sink
+
+### Automatically suspend sinks/sources that become idle for too long
+#load-module module-suspend-on-idle
+
+### Enable positioned event sounds
+load-module module-position-event-sounds
+
+
+# enable network streaming from IPs 192.168.178.x
+load-module module-native-protocol-tcp auth-ip-acl=127.0.0.1;192.168.178.0/24 auth-anonymous=1
+
+# ### Automatically load driver modules for Bluetooth hardware
+load-module module-bluetooth-policy
+load-module module-bluetooth-discover

pis/pulseaudio.service

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+[Unit]
+Description=PulseAudio system server
+
+[Service]
+Type=notify
+ExecStart=pulseaudio --daemonize=no --system --log-target=journal
+
+[Install]
+WantedBy=multi-user.target

pis/raspberry_pi_audio.md

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+Switch between line-out and HDMI
+--------------------------------
+
+amixer cset numid=3 2 # switches to HDMI
+amixer cset numid=3 1 # switches to headphone
+
+
+Set up PulseAudio
+-----------------
+
+(also available in playbook TOOD)
+

pis/start_bt_discoverable.py

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+#!/usr/bin/python3
+
+import dbus
+import sys
+
+
+def mac_address_to_dbus_path(bus):
+    manager = dbus.Interface(bus.get_object("org.bluez", "/"), "org.freedesktop.DBus.ObjectManager")
+    objects = manager.GetManagedObjects()
+    result = {}
+
+    for path, interfaces in objects.items():
+        for interface, properties in interfaces.items():
+            if not interface == 'org.bluez.Adapter1':
+                continue
+            result[str(properties['Address'])] = str(path)
+    return result
+
+
+def start_discovery(bus, dbus_path):
+    # Make sure the device is powered on
+    adapter = dbus.Interface(bus.get_object("org.bluez", dbus_path), "org.freedesktop.DBus.Properties")
+    adapter.Set("org.bluez.Adapter1", "Powered", dbus.Boolean(1))
+
+    # Get the adapter interface for discovery
+    dbus.Interface(bus.get_object("org.bluez", dbus_path), "org.bluez.Adapter1").StartDiscovery()
+
+
+def set_alias(bus, dbus_path, new_alias):
+    adapter = dbus.Interface(bus.get_object("org.bluez", dbus_path), "org.freedesktop.DBus.Properties")
+    adapter.Set("org.bluez.Adapter1", "Alias", dbus.String(new_alias))
+
+
+def main():
+    mac_address = sys.argv[1]
+    device_name = sys.argv[2]
+
+    bus = dbus.SystemBus()
+    mapping = mac_address_to_dbus_path(bus)
+    try:
+        dbus_path = mapping[mac_address]
+    except KeyError:
+        print("No Device with this MAC address found")
+        exit(1)
+    set_alias(bus, dbus_path, device_name)
+    start_discovery(bus, dbus_path)
+
+
+if __name__ == '__main__':
+    main()