• Modify /home/pi/.asoundrc, setting card # to USB Audio Device.  File appears to be auto generated/created if you start in the GUI, I had to create it myself from CLI ... it looks like this
  
  $cat .asoundrc

pcm.!default {
       type hw
       card 1
}
ctl.!default {
        type hw
        card 1
}
• copy .asoundrc to /etc/asound.conf to get thing to work at boot/service
  
  
sudo cp /home/pi/.asoundrc /etc/asound.conf  

• Make sure Serice is up and OK.  After reboot too
  
  
sudo systemctl start shairport-sync
sudo systemctl status shairport-sync


• I preset volumes to minimize fiddling with device volume using alsamixer
• Set Mic to zero
• Set Capture to zero
• Set Speaker to redline (93 on mine)

• Apples Support's HowTo Use AirPlay or AirPlay Mirroring on your iPhone, iPad, or iPod touch
  
  

HomeKit (HomeBridge)

• HomeBridge homepage @ https://github.com/nfarina/homebridge.
  Install can take some time, count on an hour with minimal plugin playtime!
• One preliminary - check for plugins for your smart devices before you go through install  - just to make sure you'll be able to control your device.  Go to https://www.npmjs.com and search for  "homebridge-<your dev>".  For example https://www.npmjs.com/package/homebridge-wemo or https://www.npmjs.com/package/homebridge-philipshue
• RPI Homebridge Install from https://github.com/nfarina/homebridge/wiki/Running-HomeBridge-on-a-Raspberry-Pi :
• Check for c++ compiler, you should see response ending with "gcc version 4.92"
  
  
g++-4.9 -v


• Install nodejs
  
  
curl -sL https://deb.nodesource.com/setup_6.x | sudo -E bash -

sudo apt-get install -y nodejs
sudo apt-get install libavahi-compat-libdnssd-dev


• HomeBridge Install:  README https://github.com/nfarina/homebridge/blob/master/README.md
  
  
sudo npm install -g --unsafe-perm homebridge


• Fire it up, it will complain about no plugins, but should see it run & offer a pairing code,  <Ctl>C to kill
  
  
homebridge 

  
• Create config.json file in /home/pi/.homebridge directory see README if you have probs, it could be your editor
• Cut/Paste-able sample @ https://github.com/nfarina/homebridge/blob/master/config-sample.json
• Plugins installation.  Steps are dependent on the smart device.   Plugins are also installed using npm, will have their own readme/instructions including a snippet to add to your config.json file.  Get plugins by searching for "homebridge-" on https://www.npmjs.com.  Expect some trial/error and fiddling to get plugins working
• Here's a WeMo Switch HowTo that worked for me https://www.raging.tech/apple-homekit-belkin-wemo-using-homebridge/.  Pretty simple start
• Testing:  Once Plugins are installed,  Fire up Homebridge and test.  I test in a terminal window for a day or two to keep an eye on message chatter
• To start Homebridge when RPI boots, create a systemd service from https://github.com/nfarina/homebridge/wiki/Running-HomeBridge-on-a-Raspberry-Pi#running-homebridge-on-bootup-systemd
• Create /etc/default/homebridge file using example from https://gist.github.com/johannrichard/0ad0de1feb6adb9eb61a/#file-homebridge
  
  
cat /etc/default/homebridge

# Defaults / Configuration options for homebridge
# The following settings tells homebridge where to find the config.json file
# and where to persist the data (i.e. pairing and others)
HOMEBRIDGE_OPTS=-U /var/lib/homebridge

# If you uncomment the following line, homebridge will log more
# You can display this via systemd's journalctl: journalctl -f -u homebridge
# DEBUG=*


• Create /etc/systemd/system/homebridge.service file using example from https://gist.github.com/johannrichard/0ad0de1feb6adb9eb61a/#file-homebridge-service
• Check homebridge location - response should be usr/bin or usr/local/bin
  
  
$ which homebridge
/usr/bin/homebridge


• Edit /etc/systemd/system/homebridge.service - set ExecStart to homebridge location (e.g. usr/bin/) 
  
  $ cat /etc/systemd/system/homebridge.service

[Unit]
Description=Node.js HomeKit Server 
After=syslog.target network-online.target

[Service]
Type=simple
User=homebridge
EnvironmentFile=/etc/default/homebridge
# Adapt this to your specific setup (could be /usr/bin/homebridge)
# See comments below for more information
ExecStart=/usr/bin/homebridge $HOMEBRIDGE_OPTS
Restart=on-failure
RestartSec=10
KillMode=process

[Install]
WantedBy=multi-user.target


• Set execute permissions for service
  
  
sudo chmod +x /etc/systemd/system/homebridge.service


• Add Homebridge system account, user and group created, no home directory (-M)
  
  
sudo useradd -M --system homebridge

  
• Create system dir and copy config.json file for new homebridge service - set ownership and write
  
  
sudo mkdir /var/lib/homebridge
sudo chmod +w /var/lib/homebridge 
sudo chown -R homebridge:homebridge /var/lib/homebridge 
sudo cp /home/pi/.homebridge/config.json /var/lib/homebridge/.


• Enable/Run/Check the service
  
  
  sudo systemctl daemon-reload
sudo systemctl enable homebridge
sudo systemctl start homebridge
sudo systemctl status homebridge


• Check /var/log/daemon.log if anything goes bump.
  
  
tac /var/log/daemon.log | less


• Reboot to get the witches out and test service startup
  
  
sudo shutdown now -r


• Set up phone via https://support.apple.com/en-us/HT204893
• if you forgot your pin/scan code dig it out of systemd journal
  
  
sudo journalctl -u homebridge


     
• Debugging:  Troubleshooting Guide @ https://github.com/nfarina/homebridge/wiki/Basic-Trouble-Shooting
• Running in terminal window is very helpful 
• See Also:  Common Issues section in the README
  
  
• Apple Home info @ https://www.apple.com/ios/home/
  
  

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