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Man Pages
COAP(7) libcoap Manual COAP(7)

coap - Overview of the libcoap library

Summary of the different libcoap API manual pages.

libcoap is a C implementation of a lightweight application-protocol for devices that are constrained by their resources such as computing power, RF range, memory, bandwidth, or network packet sizes. This protocol, CoAP, is standardized by the IETF as RFC 7252. For further information related to CoAP, see

Documentation for the specific library calls with examples can be found in the man pages referred to in SEE ALSO.

Further information can be found in the include header files with example code provided in the examples directory.

NOTE: This documentation is a work in progress. Any missing information can be found in the include header files along with example code provided in the examples directory.

coap_attribute(3), coap_cache(3), coap_context(3), coap_encryption(3), coap_endpoint_client(3), coap_handler(3), coap_io(3), coap_keepalive(3), coap_logging(3), coap_observe(3), coap_pdu_setup(3), coap_recovery(3), coap_resource(3), coap_session(3), coap_string(3) and coap_tls_library(3)

For example executables, see coap-client(5), coap-rd(5) and coap-server(5)


"RFC7252: The Constrained Application Protocol (CoAP)"

"RFC7641: Observing Resources in the Constrained Application Protocol (CoAP)"

"RFC7959: Block-Wise Transfers in the Constrained Application Protocol (CoAP)"

"RFC7967: Constrained Application Protocol (CoAP) Option for No Server Response"

"RFC8132: PATCH and FETCH Methods for the Constrained Application Protocol (CoAP)"

"RFC8323: CoAP (Constrained Application Protocol) over TCP, TLS, and WebSockets"

"RFC8613: Object Security for Constrained RESTful Environments (OSCORE)"

"RFC8768: Constrained Application Protocol (CoAP) Hop-Limit Option"

for further information.

Please report bugs on the mailing list for libcoap: or raise an issue on GitHub at

The libcoap project <>
04/13/2022 coap 4.3.0

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