24 September 2020 by Phillip Johnston • Last updated 15 August 2023Constrained Application Protocol (CoAP), defined in RFC 7252, is a specialized Internet Application Protocol (operating at the service layer) that is intended for use in resource-constrained Internet-connected devices. CoAP is designed to provide multicast support, very low overhead, simplicity, and easy translation to HTTP. CoAP is modeled after HTTP’s model of request/response and client/server communications, URI addressing (coaps://[URI]:5864 for secure connections, and coap://[URI]:5683 for insecure connections), as well as GET, POST, PUT, and DELETE operations and response codes in the 2xx-5xx range. One deviation from the common HTTP model …
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