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coap_init(3)
coap_init

## NAME

coap_init, coap_startup, coap_cleanup - Work with CoAP initialization

## SYNOPSIS

#include <coap3/coap.h>

void coap_startup(void);

void coap_cleanup(void);

For specific (D)TLS library support, link with -lcoap-3-notls, -lcoap-3-gnutls, -lcoap-3-openssl, -lcoap-3-mbedtls or -lcoap-3-tinydtls. Otherwise, link with -lcoap-3 to get the default (D)TLS library support.

## DESCRIPTION

The CoAP libcoap logic needs to be initialized before there is any use of the libcoap public API. This is done by calling coap_startup().

## FUNCTIONS

Function: coap_startup()

The coap_startup() function must be called before any other coap_*() functions are called. It is used to initialize things like mutexes, random number gererators, clocks, TLS libraries etc.

NOTE: This should be called after any other lower layer is initialized. For example, for LwIP, lwip_init() must be called before coap_startup().

NOTE: After the inital call to coap_startup(), subsequent calls are ignored until coap_cleanup() is called.

Function: coap_cleanup()

The coap_cleanup() function is used to cleanup / free any information set up by the coap_startup() function and should be the last coap_*() function called. It is possible to call coap_startup() after coap_cleanup() to re-initialize the libcoap logic.

NOTE: All other libcoap cleanups should called prior to coap_cleanup(), e.g. coap_free_context(3).

## FURTHER INFORMATION

See

"RFC7252: The Constrained Application Protocol (CoAP)"

for further information.

## BUGS

Please report bugs on the mailing list for libcoap: libcoap-developers@lists.sourceforge.net or raise an issue on GitHub at https://github.com/obgm/libcoap/issues

## AUTHORS

The libcoap project <libcoap-developers@lists.sourceforge.net>

coap_init(3)