Wi-Fi tether connected

[NateD]

A condition which checks to see if any devices are connected while tethering would be extremely useful. I was only able to find a condition check to see if tethering is turned on.

[Martin]

Getting this information most probably requires root so it's not very high priority for now.
If your device displays this information in a notification, you could use condition Notification on Statusbar Displayed to fill the text variables and then extract the information from the text.