libcbor is a C library for parsing and generating CBOR, the
general-purpose schema-less binary data format.

From cbor.io:

RFC 8949 Concise Binary Object Representation

"The Concise Binary Object Representation (CBOR) is a data format
whose design goals include the possibility of extremely small code
size, fairly small message size, and extensibility without the need
for version negotiation."

Homepage:
https://github.com/PJK/libcbor
