Switch magic trackpad to pair with another mac.

install blueutil
```
brew install blueutil
```

Find your trackpad address by running

blueutil --paired

# address: 3c-a6-f6-b9-c6-c7, connected (master, 0 dBm), not favourite, paired, name: "Magic Trackpad", recent access date: 2022-05-30 2:41:17 PM +0000

Replace - with :, you'll get 3c:a6:f6:b9:c6:c7

Open Automator
Create a new application
Search for Run a shell script
Drag to the right panel

Enter following script

res=$(/opt/homebrew/bin/blueutil --is-connected 3c:a6:f6:b9:c6:c7)

if [[ "$res" = '1' ]]
  then
    /opt/homebrew/bin/blueutil --unpair 3c:a6:f6:b9:c6:c7
  else
    /opt/homebrew/bin/blueutil --unpair 3c:a6:f6:b9:c6:c7
    sleep 1
    /opt/homebrew/bin/blueutil --pair 3c:a6:f6:b9:c6:c7
    sleep 1
    /opt/homebrew/bin/blueutil --connect 3c:a6:f6:b9:c6:c7
fi

Save as Trackpad Pairing Toggle.app
Move to /Application
Copy this script to another device (don't forget to also install blueutil)

Now when you want to switch devices, you can use Spotlight or Alfred to search for "Trackpad Pairing Toggle" and just run the app on the connected device, it will disconnect from the current device. Then run the app on another device, it will connect to the trackpad.

imekachi/trackpad-pairing-toggle.md