Our old printer finally passed away, so HomePi no longer provides AirPrint services, but here's the original recipe updated for DietPi.  I ran a quick test, looks to be good-to-go.  Install/setup takes ~30 Mins.   

• Double check that avahi & CUPS were  installed during DietPi Install steps above
  // I think "dietpi-software list | grep =2 " will highlight installed software //

  • Dietpi CUPS @ https://dietpi.com/docs/software/printing/#cups

  • Quick Start @ https://www.cups.org/doc/overview.html

• Make sure CUPS and friends are running after the install
  http://<homepiIP>:631 

CUPS Config via CUPS web interface @ http://<your PI IP address>:631 (https in latest cups)

• Log in to CUPS administration using DietPi root/<rootpw> credentials 

• Administration page: double check to ensure "Share Printers" and "Allow Remote Admin" are checked

• Administration/Add Printer - "Discovered Network Printers" found our Dell M5200 & Brother Printers
  Couple of tweaks:

  • Set "Printer Description" to match your printer, it is presented in iPhone/Pad's 'Select Printer" dialog

  • I uses Openprinting.org ppd file to set up our printer - https://www.openprinting.org/printers

  • Remember to check the "Share this Printer" box

HowTo Use AirPrint to print from your iPhone, iPad, or iPod touch by Apple Support

**** 2024 update:   HomeBridge was added to the DietPi software library sometime in 2023 (I think!).   No need for the manual install below ... or HomePi server (for me!) - Homekit services were added to our ServerPi.   Dietpi HomeBridge info is @ https://dietpi.com/docs/software/home_automation/#homebridge  ****

This one will still take some time, count on an hour with minimal plugin playtime!  

Homepage/info @ homebridge.io, github.com/homebridge/homebridge.   Install Steps are dissected from *new* HomeBridge on Raspian Lite instructions.

One very important preliminary:  Check for plugins for your smart devices before you go through all this install stuff - 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 "homebridge-wemo"  or "homebridge-" to browse the library.

No need to sudo if you are logged in as root on DietPi

1. Via dietpi-software utility:  Install a few prerequisites from Development & Programming Category
   
   [*] 9    Node.js: JavaScript runtime environment
   [*] 17   Git: Clone and manage Git repositories locally
   [*] 130  Python 3: Runtime system, pip package installer and development headers  

2. Add homebridge repository

   • Repository gpg key:
     curl -sSfL https://repo.homebridge.io/KEY.gpg | sudo gpg --dearmor | sudo tee /usr/share/keyrings/homebridge.gpg  > /dev/null

   • Add Repository to system sources:
     echo "deb [signed-by=/usr/share/keyrings/homebridge.gpg] https://repo.homebridge.io stable main" | sudo tee /etc/apt/sources.list.d/homebridge.list > /dev/null

3. Install Homebridge and Homebridge Config UI X

   • Homebridge (which now seems to also install user interface (Config UI)
     apt-get update
     apt-get install homebridge

   • Log into Homebridge Config UI X (This is NICE!) - Default uc/pw = admin/admin - and follow "GET STARTED"
     http://<ip address of your server>:8581

4. Install Plugins based on your IoT world ... The following is a blow-by-blow of adding Nest Plugin - mostly for my sake!
   Steps dissected from https://www.npmjs.com/package/homebridge-config-ui-x

   • Login to UI X via http://<homepi>:858, clink on "Plugins" in the menu bar 

   • Search for plugin's by name/keyword.  There may be multiple plugins to choose from, you'll need to research (check project and readme).
     Alternatively,  search directly via npmjs.com  using "homebridge-" as a prefix.  You can sort/filter based on popularity, quality, maintenance, etc.  

   • INSTALL link on UI X page will add the plugin - homebridge-nest (Nest v4.6.9 plug-in using native Nest API) has worked well).  Plugin's routinely run through a setup/configuration dialog - Nest doc @ https://github.com/chrisjshull/homebridge-nest.  

   • Set up IOS phone via https://support.apple.com/en-us/HT204893.
     PIN/Scan code is on main page of Config UI X.  You can also dig it out of systemd journal via journalctl -u homebridge

   • Debugging:  Troubleshooting Guide @ https://github.com/nfarina/homebridge/wiki/Basic-Trouble-Shooting

Apple Home info @ https://www.apple.com/ios/home/

Cleaned up the recipe but ended up not upgrading to fresh Bullseye rebuild.  Decided to hold off because of an issue with Backup/Restore @ https://github.com/homebridge/homebridge/issues/3346.   Will revisit when I have time. 

A couple of plugin updates

• Updated Node.js by hand - v16.19.1 to v18.16.0.  Pretty simple/painless via Homebridge ... should be automagically managed by Dietpi in new recipe(?!). 
  More info @ https://github.com/homebridge/homebridge/wiki/How-To-Update-Node.js. 
  Check version via:   node -v
  Update via:  [sudo] hb-service update-node

• Homebridge-Hue:  v0.13.49 to v0.13.59

• Homebridge-Wemo:  v5.0.5 to v6.0.2

• homebridge-smartthings-ik:  v1.5.0 to v1.5.8

Spring cleaning during the winter ... some leftover HomePi updates.  Should be good for a long while!

1. DietPi update from 7.5.2 to 8.1.2 ... no issues.  Just let dietpi-update do it's thing! 

2. Homebridge World

   • Homebridge update v1.3.6 to 1.4.0 ... no issues

   • Homebridge Plugins

     • HomebridgeUi update from v4.41.2 to 4.42

     • Homebridge Deebotecovacs update from v1.4.6 to 1.4.7 ... hmmm some odd chatter during update

     • Homebridge-hue update from v0.13.22 to v013.36

       • plugin recommends running on Node.js v16.13.2 or later ... Easy enough:
         From Homebridge "How to Update Node.js" article, did one of these:  hb-service update-node

     • Homebridge Nest update from v4.6.3 to 4.6.4

     • Homebridge Platform Wemo v3.3.1 - Replace with Homebridge-wemo v4.7.0

       • Platform Wemo was deprecated/replaced quite a while ago but w/out auto migration.  Just hadn't taken time to deal w/ ramifications of automations and such - some old/original smart-stuff here

       •  Step-by-step based on info @ https://www.npmjs.com/package/homebridge-platform-wemo

         1. Backup Homebridge (... Backup/Restore)

         2. Saved a copy of json from HB Config editor (not much there)

         3. Disabled current Wemo-Platform Plugin and restarted HB

         4. Uninstalled Wemo-Platform Plugin 

         5. Installed homebridge-wemo Plugin and accepted config as presented (json looked just like old)

         6. Restarted HB  

         7. Had to move Wemo stuff to correct room assignments and re-setup Automations ... not too bad

     • Homebridge Bravia Tvos - v5.0.1 to v5.0.8

     • Homebridge Nest - v4.5.4 to v4.6.4

     • Homebridge Smartthings - v2.3.8