Smart thermostat
Another major feature of smart thermostats is their ability to connect to the internet. Smart thermostats are designed with a WiFi module that allows the thermostat to connect to the users home or office network and interface with a web portal or smartphone application, allowing users to control the unit remotely. The WiFi feature also has the ability to send reports on energy usage and HVAC system performance via the web portal, informing the user on their energy efficiency and how it compares to other smart thermostat users. It also alerts users when a problem arises with their HVAC system or when it is time for equipment maintenance. The thermostat also uses the WiFi connection to display current weather conditions and the weather forecast.
Wireless light switch
There are more and more light switches can be controlled by smartphone. Usually user can control the light using mobile app. But for some products, extra corresponding hub is needed to connect those smart switches. 
In order to avoid the hub, wireless light switch and luminaire needs to share the same protocol, e.g. Bluetooth mesh Lighting model or Zigbee LightLink.