YES - I have solved this problem using IFTTT. I have both Pro-2 and Pro-3 cameras on my system. Its too bad the Pro-3 is not visible to ST via the Arlo link, but you can create the same functionality using IFTTT as a bridge between Arlo and Smartthings.
Problem: Smartthings (ST) does not “see” your Pro-3 camera, so you cannot use its motion detector to activate other ST devices.
Solution: Use IFTTT to detect when your Pro-3 detects motion, and respond by turning ON a Device in ST.
IFTTT will see your Pro-3 camera if you correctly set up the link between Arlo and IFTTT. The linking process starts on the IFTTT side. The first time you start to create an Applet in IFTTT that uses Arlo as either the “IF” or the “THEN” service, it will ask you to provide your Arlo credentials to connect the accounts.
Similarly, you have to grant specific permission for the Smartthings Devices you want to share with IFTTT. The first time you try to use a ST device in an Applet, IFTTT will ask you to link to your ST account. After connecting ST to IFTTT, go back to the ST App to set up the list of shared devices. You will now see IFTTT listed in your “connected services” in the Settings menu on the Smartthings app. When you click on the icon for IFTTT , Smartthings will let you specify all the ST devices you wish to share with IFTTT. If you dont go through this step, IFTTT will not display any “devices” when you try to create the Applet.
Now the easy part: creating the IFTTT Applet
Create an IFTTT Applet that does this:
choose service: ARLO (if not already linked, you will be prompted)
choose trigger: Motion Detected
which Device?: from drop-down list
CLICK “Create Trigger”
choose service: Smartthings
choose action: Switch on
CLICK “Create Action”