There’s also a page to set actions and responses. With the smart plugs you can have the action be either the temperature or energy consumption reaching a set limit. The response can be a notification or email, or one of the other devices responding switching on or off.
Finally, what about that soft power button on each unit? That’s a manual override to switch it on or off.
It’s a pity about the connection issues. I wouldn’t let it put me off. As with many of these things, it’s usually just a matter of persisting, and doing the odd restart along the way. Once that’s done, the D-Link Smart Plugs turned out to be very effective controllers, with the unexpected benefit of monitoring and even system protection.