Build shairport sync with MQTT support on Raspberry Pi

This is a tested path on Raspbian stretch

pre-reqs to build

https://github.com/mikebrady/shairport-sync/blob/master/INSTALL.md

sudo apt update
sudo apt upgrade
# install deps 
sudo apt install -y build-essential git screen xmltoman autoconf automake \
    libtool libdaemon-dev libpopt-dev libconfig-dev libasound2-dev avahi-daemon \
    libavahi-client-dev libssl-dev libsoxr-dev  libsndfile1-dev libmosquitto-dev

use the source, Todd

Clone the shairport-sync repo if you haven't already

### screen or tmux is useful for slow builds
# screen 
cd ~/projects
git clone https://github.com/mikebrady/shairport-sync.git
cd shairport-sync

build shairport-sync with systemd, metadata and MQTT support

cd ~/projects/shairport-sync

autoreconf -fi
./configure --sysconfdir=/etc --with-configfiles \
    --with-alsa --with-avahi \
    --with-ssl=openssl \
    --with-systemd \
    --with-metadata --with-mqtt-client

make
sudo make install

configure shairport-sync config file

# edit to configure /etc/shairport.conf  (See below)
grep -v ^// /etc/shairport-sync.conf
# sudo cp -v /etc/shairport-sync.conf.sample  /etc/shairport-sync.conf
sudo vi /etc/shairport-sync.conf

salient pieces of a working config file

metadata =
{
	enabled = "yes"; // set this to yes to get Shairport Sync to solicit metadata from the source and to pass it on via a pipe
	include_cover_art = "yes"; // set to "yes" to get Shairport Sync to solicit cover art from the source and pass it via the pipe. You must also set "enabled" to "yes".
};

mqtt =
{
	enabled = "yes";
	hostname = "mqttbrokerhost"; // Hostname of the MQTT Broker
	port = 1883;
	topic = "shairport-sync/rpih1"; //MQTT topic where this instance of shairport-sync should publish. If not set, the general.name value is used.
	publish_parsed = "yes"; //whether to publish a small (but useful) subset of metadata under human-understandable topics
	publish_cover = "yes"; //whether to publish the cover over mqtt in binary form. This may lead to a bit of load on the broker
	enable_remote = "yes"; //whether to remote control via MQTT. RC is available under `topic`/remote.
}

• hostname mqttbrokerhost may need an entry in /etc/hosts
• topic needs to be consistent with topic configured for app.py

Debug steps

# if outputting sound from this Pi, can list sound cards
aplay -l

systemd startup for shairport-sync service

less /lib/systemd/system/shairport-sync.service
sudo systemctl force-reload shairport-sync
sudo systemctl enable shairport-sync
sudo systemctl status shairport-sync
sudo systemctl start shairport-sync

journalctl -u shairport-sync