libcoap2-dev 4.2.1-1build1 (amd64 binary) in ubuntu jammy

 Lightweight application-protocol for devices that are constrained their
 resources such as computing power, RF range, memory, bandwidth, or network
 packet sizes. This protocol, CoAP, is developed in the IETF working group
 "CoRE", <http://6lowapp.net> and was standardized in RFC 7252.
 .
 This package contains the developer files like headers, the static library
 and the pkg-config file.