IoT is the internet of things. Smart devices connected wirelessly together, such as lighting or applicances. Simple application and low risk. But what is IIoT? IoT uses Bluetooth, WiFi or specific 802.14.5 based radios, for ZigBee for example, for a localised network.
Vendors like Ruckus and Aruba are supporting BLE and ZigBee in their new WiFi6 Access Points.
Like IoT, IIoT is designed for Industrial applications- hence the additional I. It has been developed to handle more critical machines using more sensitive and precise sensors for industries like Defence, Healthcare, Energy to name a few.
Cambium Networks IIoT range of products support a range of protocols over their own low frequency radio equipment.
Your application will depend on what wireless range of products you will need to consider. If you are integrating smart devices onto your WiFi network you will need to make sure that your Wireless networks supports the required protocols.