RFC 7252
RFC 7252 - The Constrained Application Protocol (CoAP)
Overview
Defines CoAP, a lightweight RESTful protocol for constrained IoT devices running over UDP. Features a compact 4-byte fixed header, GET/POST/PUT/DELETE methods mirroring HTTP, confirmable and non-confirmable message types, and content negotiation. Designed for 6LoWPAN and IEEE 802.15.4 radio networks.
Why it matters for RFID
Enables REST-like communication with constrained RFID edge devices and sensor-tag gateways on low-power wireless networks where HTTP overhead is prohibitive.