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Published on May 9, 2014
Zach Shelby gives a deep dive tutorial on constrained protocol. CoAP is an embedded web transfer protocol for constrained devices. It's a very efficient RESTful protocol specialized for IoT applications with a simple 4 byte header. It uses asynchronous transaction model, UDP binding with reliability and multicast. Some of the other features of CoAP include • DTLS based PSK, RPK and Certificate security • Subset of MIME types and HTTP response codes • Built-in resource discovery • Optional observation and block transfer • Supports URI and GET, POST, PUT, DELETE methods