Sunscreen. Towels. A book for the beach. Skis. Winter jackets. Maybe a snowboard. Yes, the vacation home necessities — be it on the shores of Cape Cod or in the Green Mountains of Vermont — can definitely vary by location. But not all. Perhaps just as important as some of those fun essentials is smart-home technology, from energy-friendly thermostats to automated tech-savvy locks and security systems. Vacation property owners in New England are increasingly relying on them to get the most out...