IoT world is rapidly growing. All kind of network configurations including Mesh is widely used. The article discusses wireless network protocols such as WiFi, Bluetooth Low Energy, ZigBee, WirelessHART and Thread that are used to solve the IoT challenges. We will describe how and when it is reasonable to use the above protocols. The following tasks will be covered in relation to the protocols: Demand/Response, Home/Building Automation and Health Care appliances.