A Survey of Software-Defined Networking (SDN) Controllers for Internet of Things (IoT) Applications

 Many local devices across the globe, including those in homes, oil wells, hospitals, vehicles, andcountless more locations, will be linked through the Internet of Things (IoT). The number of connecteddevices will surpass 50 billion in 2020, as predicted by Gartner. Some examples of this strategy includethe (IoMT, IoNT, and IoBT). All of this is situated beneath the network architecture. More design,construction, and mapping flexibility is brought about by the software-defined network, or SDN. Toenable SDN to support the functioning of the Internet of Things (IoT), the SDN controller is the "core"of SDN in any network. Given the pervasiveness of IoT devices and the critical role that SDN controllersplay in enabling them, we will examine the most effective controller types and determine which ones aremost suited to IoT devices. As a result, there are unique requirements for security, speed, and otheraspects of IoT applications. This will serve as the foundation for the comparison, which will be carriedout utilising the API and the Python programming language.