使用 Google Nest Mini 串流 AirPlay 藉由 macOS
之前有寫一篇「使用 Google Nest Mini 串流 AirPlay 藉由 Raspberry Pi」，後來發現效能不是很好有點 lag，所以改用 Mac 桌機來幫忙串流。目標還是把 Google Nest Mini 變成可以透過 AirPlay 串流音樂。
可以先瀏覽 AirConnect 使用已經發佈的版本：https://github.com/philippe44/AirConnect/releases
然後我選擇當前的版本 1.7.0 ，先下載好該版本 AirConnect-1.7.0.zip 。建議先建立好一個目錄再解開，要不然會有一堆檔案散落在您的 Downloads 目錄。
sam@liho ~ % mkdir ~/Downloads/AirConnect-1.7.0
sam@liho ~ % cd ~/Downloads/AirConnect-1.7.0
sam@liho AirConnect-1.7.0 % unzip ~/Downloads/AirConnect-1.7.0.zip
Archive: /Users/sam/Downloads/AirConnect-1.7.0.zip
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inflating: vcruntime140.dll安裝前先安裝 openssl
sam@liho AirConnect-1.7.0 % brew install openssl如果 homebrew 位於 /opt/homebrew 路徑，那要變成 root 並設定 openssl 環境
sam@liho AirConnect-1.7.0 % sudo -s
Password:
root@liho AirConnect-1.7.0 # ln -s /opt/homebrew/lib/libssl.dylib /usr/local/lib/libssl.dylib
root@liho AirConnect-1.7.0 # ln -s /opt/homebrew/lib/libcrypto.dylib /usr/local/lib/libcrypto.dylib然後把下載預先編譯好的執行檔案複製到相對應的地方，並且設定可以執行。
root@liho AirConnect-1.7.0 # mkdir -p /usr/local/bin
root@liho AirConnect-1.7.0 # cp aircast-macos-x86_64-static /usr/local/bin/aircast
root@liho AirConnect-1.7.0 # chmod 755 /usr/local/bin/aircast可以先用 aircast 執行確認一下是否有抓到 Google Nest Mini，因為我的環境有兩個網段，所以要指定綁定在哪個網段。如果沒有別的網段就可以忽略 -b 的選項。
root@liho AirConnect-1.7.0 # /usr/local/bin/aircast -b en0執行後會出現安全警告，的確也要注意因為有可能裡面會有惡意程式，我選擇相信它 ，所以先按 Cancel：
然後進入「系統偏好」內「安全及隱私」允許 aircast 這支程式，解鎖然後按「Allow Anyway」
再次執行前述指令「/usr/local/bin/aircast -b en0」，然後按「Open」繼續。
用上述的指令，就可以啟動服務，但是還沒設定成背景執行。 先用 command ⌘ + C 跳出來。然後產生 config 檔案，用下列指令：
root@liho AirConnect-1.7.0 # mkdir -p /usr/local/etc
root@liho AirConnect-1.7.0 # /usr/local/bin/aircast -b en0 -i /usr/local/etc/aircast.xml然後進入「/usr/local/etc/aircast.xml」檔案編輯，看哪些要 disable 哪些要重新命名。下面的範例省略其他裝置，如果要 disable 就把 「<enabled>1</enabled>」改成「<enabled>0</enabled>」，如果要改名就編輯在「<name>XXXXXXX</name>」裡面的值。
root@liho AirConnect-1.7.0 # vi /usr/local/etc/aircast.xml
(omit)
<device>
<udn>FE49198C-0AFE-4687-A516-XXXXXXXXXXXX</udn>
<name>Google Nest Mini</name>
<mac>cc:cc:b7:XX:XX:XX</mac>
<enabled>1</enabled>
</device>
(omit)然後用下列指令啟動服務：
root@liho AirConnect-1.7.0 # /usr/local/bin/aircast -b en0 -l -z -x /usr/local/etc/aircast.xml沒有問題的話應該可以看到剛剛設定的 Google Nest Mini
然後在 console 按 command ⌘ + C 跳出來，開始設定每次開機自動執行 aircast 程式，先產生 Launch Daemons 組態檔。
root@liho AirConnect-1.7.0 # vi /Library/LaunchDaemons/aircast.plist
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
<key>Label</key>
<string>aircast</string>
<key>ProgramArguments</key>
<array>
<string>/usr/local/bin/aircast</string>
<string>-b</string>
<string>en0</string>
<string>-l</string>
<string>-z</string>
<string>-x</string>
<string>/usr/local/etc/aircast.xml</string>
</array>
<key>NetworkState</key>
<true/>
<key>RunAtLoad</key>
<true/>
<key>LaunchOnlyOnce</key>
<true/>
<key>KeepAlive</key>
<true/>
<key>StandardErrorPath</key>
<string>/var/log/aircast.log</string>
<key>EnvironmentVariables</key>
<dict>
<key>PATH</key>
<string>/opt/homebrew/bin:/opt/homebrew/sbin:/usr/local/sbin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin</string>
</dict>
</dict>
</plist>然後設定開機後就執行
root@liho AirConnect-1.7.0 # launchctl enable system/aircast
root@liho AirConnect-1.7.0 # launchctl bootstrap system /Library/LaunchDaemons/aircast.plist如果開機不想load可以用下列指令：
root@liho ~ # launchctl unload -w /Library/LaunchDaemons/aircast.plist
root@liho ~ # rm -rf /Library/LaunchDaemons/aircast.plist
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