feat #15: bluetooth

- a2dp as bluetooth speaker
- disable discovery while connected
- bt-agent service accepts connections without authorization
- OSMC and Dietpi clients

Makefile

@@ -5,6 +5,7 @@ HOME_ASSISTANT_CONFIG := ~/network/home-assistant/config
 DEV_SYSTEMD_CONFIG_DIR := ~/.config/systemd/user
 LIVE_SYSTEMD_CONFIG_DIR := /etc/systemd/system
 LIVE_NGINX_CONFIG_DIR := /etc/nginx/sites-available
+LIVE_BLUETOOTH_CONFIG_DIR := /etc/bluetooth
 
 VENV := .venv
 SYSTEMCTL_USER ?=
@@ -197,14 +198,28 @@ live-install: debian $(DEBIAN_UNITS)
 
 # Player install
 #
-debian-%-install: debian iris.%.conf debian/nginx.override.conf
+install-bluetooth:
+	install -t $(LIVE_SYSTEMD_CONFIG_DIR) bluetooth/[email protected]
+	install -t $(LIVE_BLUETOOTH_CONFIG_DIR) bluetooth/main.conf
+	install -m 0775 -t /usr/local/bin/ bluetooth/bluetooth-udev
+	install -t /etc/udev/rules.d/ bluetooth/99-bluetooth-udev.rules
+
+debian-%-install: iris.%.conf debian/nginx.override.conf install-bluetooth
 	install -t $(LIVE_NGINX_CONFIG_DIR) iris.$*.conf
 	install -T -D debian/nginx.override.conf $(LIVE_SYSTEMD_CONFIG_DIR)/nginx.service.d/override.conf
 
-dietpi-%-install: dietpi iris.%.conf dietpi/nginx.override.conf
+# osmc 2022.09+ already has some of these
+debian-install-bluetooth:
+	apt-get install -y --no-install-recommends bluetooth bluez-tools armv7-bluezalsa-osmc
+
+dietpi-%-install: iris.%.conf dietpi/nginx.override.conf install-bluetooth
 	install -t $(LIVE_NGINX_CONFIG_DIR) iris.$*.conf
 	install -T -D dietpi/nginx.override.conf $(LIVE_SYSTEMD_CONFIG_DIR)/nginx.service.d/override.conf
 
+# bluez-alsa is in: Raspbian 10 (but not installable) and Raspbian 12+
+dietpi-install-bluetooth:
+	apt-get install -y --no-install-recommends bluetooth bluez-tools bluez-alsa
+
 clean:
 	-rm $(ALL_CONFIGS)
 

README.md

@@ -7,7 +7,8 @@ A **config generator** for a multizone audio system based on snapcast, Mopidy an
   - [x] Airplay
   - [x] Mopidy/MPD
   - [x] Kodi
-  - [ ] Bluetooth
+  - [x] Bluetooth
+    - [x] automatically accept new connections
 - [x] seamless switching between protocols in each zone
 - [x] high-priority announcement streams (alarms, doorbells)
 - [ ] invisible, automatic party reconfiguration
@@ -105,7 +106,7 @@ which implements control of concurrent playback streams via
 
 - snapclient v0.25+
 - nginx
-- dietpi
+- dietpi 9+ (Debian 12 "Bookworm") or [DietPi Bookworm test images](https://dietpi.com/blog/?p=2809))
 - OSMC / Kodi v19+
 - [kodi2mqtt](https://github.com/void-spark/kodi2mqtt)
   - install by manually extracting the zip in `~/.kodi/addons/` on the client

bluetooth/99-bluetooth-udev.rules

@@ -0,0 +1,2 @@
+SUBSYSTEM=="input", GROUP="input", MODE="0660"
+KERNEL=="input[0-9]*", RUN+="/usr/local/bin/bluetooth-udev"

bluetooth/bluetooth-udev

@@ -0,0 +1,18 @@
+#!/bin/bash
+#
+# From rpi-audio-receiver by nicokaiser
+# https://github.com/nicokaiser/rpi-audio-receiver/blob/main/install-bluetooth.sh
+#
+#
+if [[ ! $NAME =~ ^\"([0-9A-F]{2}[:-]){5}([0-9A-F]{2})\"$ ]]; then exit 0; fi
+action=$(expr "$ACTION" : "\([a-zA-Z]\+\).*")
+if [ "$action" = "add" ]; then
+    bluetoothctl discoverable off
+    # disconnect wifi to prevent dropouts
+    #ifconfig wlan0 down &
+fi
+if [ "$action" = "remove" ]; then
+    # reenable wifi
+    #ifconfig wlan0 up &
+    bluetoothctl discoverable on
+fi

bluetooth/bt-agent@.service

@@ -0,0 +1,16 @@
+[Unit]
+Description=Bluetooth Agent
+Requires=bluetooth.service
+After=bluetooth.service
+
+[Service]
+ExecStartPre=/usr/bin/bluetoothctl discoverable on
+ExecStartPre=/usr/bin/hciconfig %I piscan
+ExecStartPre=/usr/bin/hciconfig %I sspmode 1
+ExecStart=/usr/bin/bt-agent --capability=NoInputNoOutput
+RestartSec=5
+Restart=always
+KillSignal=SIGUSR1
+
+[Install]
+WantedBy=multi-user.target

bluetooth/main.conf

@@ -0,0 +1,3 @@
+[General]
+# bluetooth speaker
+Class = 0x200414