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{{IP stack}}
'''Constrained Application Protocol''' ('''CoAP''') is a specialized UDP-based Internet application protocol for constrained devices, as defined in [https://datatracker.ietf.org/doc/html/rfc7252 RFC 7252]. It enables those constrained devices called "nodes" to communicate with the wider Internet using similar protocols.
CoAP is designed for use between devices on the same constrained network (e.g., low-power, lossy networks), between devices and general nodes on the Internet, and between devices on different constrained networks both joined by an internet. CoAP is also being used via other mechanisms, such as SMS on mobile communication networks.
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