Internet UDP port 5683 is primarily used by the Constrained Application Protocol (CoAP). CoAP is a specialized web transfer protocol for use with constrained nodes and constrained networks in the Internet of Things. It is designed to easily translate to HTTP for simplified integration with the web, while also meeting specialized requirements such as multicast support, very low overhead, and simplicity for constrained environments. Examples of software that use this protocol include home automation systems and various IoT devices.
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