CoAP context interface. More...

#include <stdlib.h>
#include <string.h>
#include <sys/select.h>
#include <sys/time.h>
#include <time.h>
#include "coap_io.h"
#include "coap_dtls.h"
#include "coap_event.h"
#include "pdu.h"
#include "coap_session.h"
#include "coap_debug.h"

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Macros
#define	coap_send_large(session, pdu) coap_send(session, pdu)

#define	coap_join_mcast_group(ctx, groupname) (coap_join_mcast_group_intf(ctx, groupname, NULL))

#define	COAP_IO_WAIT 0

#define	COAP_IO_NO_WAIT ((uint32_t)-1)

#define	COAP_RUN_NONBLOCK COAP_RUN_NONBLOCK_deprecated_use_COAP_IO_NO_WAIT

#define	COAP_RUN_BLOCK COAP_RUN_BLOCK_deprecated_use_COAP_IO_WAIT

Typedefs
typedef enum coap_response_t	coap_response_t

typedef coap_response_t(*	coap_response_handler_t) (coap_session_t session, const coap_pdu_t sent, const coap_pdu_t *received, const coap_mid_t mid)
	Response handler that is used as callback in coap_context_t. More...

typedef void(*	coap_nack_handler_t) (coap_session_t session, const coap_pdu_t sent, const coap_nack_reason_t reason, const coap_mid_t mid)
	Negative Acknowedge handler that is used as callback in coap_context_t. More...

typedef void(*	coap_ping_handler_t) (coap_session_t session, const coap_pdu_t received, const coap_mid_t mid)
	Received Ping handler that is used as callback in coap_context_t. More...

typedef void(*	coap_pong_handler_t) (coap_session_t session, const coap_pdu_t received, const coap_mid_t mid)
	Received Pong handler that is used as callback in coap_context_t. More...

typedef int(*	coap_lwip_input_wait_handler_t) (void *arg, uint32_t milli_secs)
	LwIP callback handler that can be used to wait / timeout for the next input packet. More...

Enumerations
enum	coap_response_t { COAP_RESPONSE_FAIL , COAP_RESPONSE_OK }

Functions
void	coap_register_response_handler (coap_context_t *context, coap_response_handler_t handler)
	Registers a new message handler that is called whenever a response is received. More...

void	coap_register_nack_handler (coap_context_t *context, coap_nack_handler_t handler)
	Registers a new message handler that is called whenever a confirmable message (request or response) is dropped after all retries have been exhausted, or a rst message was received, or a network or TLS level event was received that indicates delivering the message is not possible. More...

void	coap_register_ping_handler (coap_context_t *context, coap_ping_handler_t handler)
	Registers a new message handler that is called whenever a CoAP Ping message is received. More...

void	coap_register_pong_handler (coap_context_t *context, coap_pong_handler_t handler)
	Registers a new message handler that is called whenever a CoAP Pong message is received. More...

void	coap_register_option (coap_context_t *ctx, uint16_t type)
	Registers the option type `type` with the given context object `ctx`. More...

coap_context_t *	coap_new_context (const coap_address_t *listen_addr)
	Creates a new coap_context_t object that will hold the CoAP stack status. More...

int	coap_context_set_psk (coap_context_t context, const char hint, const uint8_t *key, size_t key_len)
	Set the context's default PSK hint and/or key for a server. More...

int	coap_context_set_psk2 (coap_context_t context, coap_dtls_spsk_t setup_data)
	Set the context's default PSK hint and/or key for a server. More...

int	coap_context_set_pki (coap_context_t context, const coap_dtls_pki_t setup_data)
	Set the context's default PKI information for a server. More...

int	coap_context_set_pki_root_cas (coap_context_t context, const char ca_file, const char *ca_dir)
	Set the context's default Root CA information for a client or server. More...

void	coap_context_set_keepalive (coap_context_t *context, unsigned int seconds)
	Set the context keepalive timer for sessions. More...

int	coap_context_get_coap_fd (const coap_context_t *context)
	Get the libcoap internal file descriptor for using in an application's select() or returned as an event in an application's epoll_wait() call. More...

void	coap_context_set_max_idle_sessions (coap_context_t *context, unsigned int max_idle_sessions)
	Set the maximum idle sessions count. More...

unsigned int	coap_context_get_max_idle_sessions (const coap_context_t *context)
	Get the maximum idle sessions count. More...

void	coap_context_set_session_timeout (coap_context_t *context, unsigned int session_timeout)
	Set the session timeout value. More...

unsigned int	coap_context_get_session_timeout (const coap_context_t *context)
	Get the session timeout value. More...

void	coap_context_set_csm_timeout (coap_context_t *context, unsigned int csm_tmeout)
	Set the CSM timeout value. More...

unsigned int	coap_context_get_csm_timeout (const coap_context_t *context)
	Get the CSM timeout value. More...

void	coap_context_set_csm_max_message_size (coap_context_t *context, uint32_t csm_max_message_size)
	Set the CSM max session size value. More...

uint32_t	coap_context_get_csm_max_message_size (const coap_context_t *context)
	Get the CSM max session size value. More...

void	coap_context_set_max_handshake_sessions (coap_context_t *context, unsigned int max_handshake_sessions)
	Set the maximum number of sessions in (D)TLS handshake value. More...

unsigned int	coap_context_get_max_handshake_sessions (const coap_context_t *context)
	Get the session timeout value. More...

uint16_t	coap_new_message_id (coap_session_t *session)
	Returns a new message id and updates `session->tx_mid` accordingly. More...

void	coap_free_context (coap_context_t *context)
	CoAP stack context must be released with coap_free_context(). More...

void	coap_set_app_data (coap_context_t context, void data)
	Stores `data` with the given CoAP context. More...

void *	coap_get_app_data (const coap_context_t *context)
	Returns any application-specific data that has been stored with `context` using the function coap_set_app_data(). More...

coap_pdu_t *	coap_new_error_response (const coap_pdu_t request, coap_pdu_code_t code, coap_opt_filter_t opts)
	Creates a new ACK PDU with specified error `code`. More...

coap_mid_t	coap_send_error (coap_session_t session, const coap_pdu_t request, coap_pdu_code_t code, coap_opt_filter_t *opts)
	Sends an error response with code `code` for request `request` to `dst`. More...

coap_mid_t	coap_send_message_type (coap_session_t session, const coap_pdu_t request, coap_pdu_type_t type)
	Helper function to create and send a message with `type` (usually ACK or RST). More...

coap_mid_t	coap_send_ack (coap_session_t session, const coap_pdu_t request)
	Sends an ACK message with code `0` for the specified `request` to `dst`. More...

COAP_STATIC_INLINE coap_mid_t	coap_send_rst (coap_session_t session, const coap_pdu_t request)
	Sends an RST message with code `0` for the specified `request` to `dst`. More...

coap_mid_t	coap_send (coap_session_t session, coap_pdu_t pdu)
	Sends a CoAP message to given peer. More...

int	coap_handle_event (coap_context_t context, coap_event_t event, coap_session_t session)
	Invokes the event handler of `context` for the given `event` and `data`. More...

int	coap_can_exit (coap_context_t *context)
	Returns 1 if there are no messages to send or to dispatch in the context's queues. More...

void	coap_ticks (coap_tick_t *)
	Returns the current value of an internal tick counter. More...

int	coap_join_mcast_group_intf (coap_context_t ctx, const char groupname, const char *ifname)
	Function interface for joining a multicast group for listening for the currently defined endpoints that are UDP. More...

int	coap_mcast_set_hops (coap_session_t *session, size_t hops)
	Function interface for defining the hop count (ttl) for sending multicast traffic. More...

void	coap_mcast_per_resource (coap_context_t *context)
	Function interface to enable processing mcast requests on a per resource basis. More...

int	coap_io_process (coap_context_t *ctx, uint32_t timeout_ms)
	The main I/O processing function. More...

int	coap_io_process_with_fds (coap_context_t ctx, uint32_t timeout_ms, int nfds, fd_set readfds, fd_set writefds, fd_set exceptfds)
	The main message processing loop with additional fds for internal select. More...

int	coap_io_pending (coap_context_t *context)
	Check to see if there is any i/o pending for the `context`. More...

unsigned int	coap_io_prepare_io (coap_context_t ctx, coap_socket_t sockets[], unsigned int max_sockets, unsigned int *num_sockets, coap_tick_t now)
	Iterates through all the coap_socket_t structures embedded in endpoints or sessions associated with the `ctx` to determine which are wanting any read, write, accept or connect I/O (COAP_SOCKET_WANT_xxx is set). More...

void	coap_io_do_io (coap_context_t *ctx, coap_tick_t now)
	Processes any outstanding read, write, accept or connect I/O as indicated in the coap_socket_t structures (COAP_SOCKET_CAN_xxx set) embedded in endpoints or sessions associated with `ctx`. More...

unsigned int	coap_io_prepare_epoll (coap_context_t *ctx, coap_tick_t now)
	Any now timed out delayed packet is transmitted, along with any packets associated with requested observable response. More...

void	coap_io_do_epoll (coap_context_t ctx, struct epoll_event events, size_t nevents)
	Process all the epoll events. More...

void	coap_lwip_dump_memory_pools (coap_log_t log_level)
	Dump the current state of the LwIP memory pools. More...

void	coap_lwip_set_input_wait_handler (coap_context_t context, coap_lwip_input_wait_handler_t handler, void input_arg)
	Set up a wait / timeout callback handler for use when the application calls coap_io_process(). More...

COAP_STATIC_INLINE COAP_DEPRECATED int	coap_run_once (coap_context_t *ctx, uint32_t timeout_ms)

COAP_STATIC_INLINE COAP_DEPRECATED unsigned int	coap_write (coap_context_t ctx, coap_socket_t sockets[], unsigned int max_sockets, unsigned int *num_sockets, coap_tick_t now)

COAP_STATIC_INLINE COAP_DEPRECATED void	coap_read (coap_context_t *ctx, coap_tick_t now)

Detailed Description

CoAP context interface.

Definition in file net.h.

Macro Definition Documentation

◆ COAP_RUN_BLOCK

#define COAP_RUN_BLOCK COAP_RUN_BLOCK_deprecated_use_COAP_IO_WAIT

Definition at line 884 of file net.h.

◆ COAP_RUN_NONBLOCK

#define COAP_RUN_NONBLOCK COAP_RUN_NONBLOCK_deprecated_use_COAP_IO_NO_WAIT

Definition at line 883 of file net.h.

Function Documentation

◆ coap_read()

COAP_STATIC_INLINE COAP_DEPRECATED void coap_read	(	coap_context_t *	ctx,
		coap_tick_t	now
	)

Deprecated:: Use coap_io_do_io() instead.

This function just calls coap_io_do_io().

Internal function.

Parameters

ctx	The CoAP context
now	Current time

Definition at line 877 of file net.h.

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◆ coap_run_once()

COAP_STATIC_INLINE COAP_DEPRECATED int coap_run_once	(	coap_context_t *	ctx,
		uint32_t	timeout_ms
	)

Deprecated:: Use coap_io_process() instead.

This function just calls coap_io_process().

Parameters

ctx The CoAP context

timeout_ms Minimum number of milliseconds to wait for new packets before returning after doing any processing. If COAP_IO_WAIT, the call will block until the next internal action (e.g. packet retransmit) if any, or block until the next packet is received whichever is the sooner and do the necessary processing. If COAP_IO_NO_WAIT, the function will return immediately after processing without waiting for any new input packets to arrive.

Returns: Number of milliseconds spent in function or -1 if there was an error

Definition at line 833 of file net.h.

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◆ coap_write()

COAP_STATIC_INLINE COAP_DEPRECATED unsigned int coap_write	(	coap_context_t *	ctx,
		coap_socket_t *	sockets[],
		unsigned int	max_sockets,
		unsigned int *	num_sockets,
		coap_tick_t	now
	)

Deprecated:: Use coap_io_prepare_io() instead.

This function just calls coap_io_prepare_io().

Internal function.

Parameters

ctx	The CoAP context
sockets	Array of socket descriptors, filled on output
max_sockets	Size of socket array.
num_sockets	Pointer to the number of valid entries in the socket arrays on output.
now	Current time.

Returns: timeout Maxmimum number of milliseconds that can be used by a select() to wait for network events or 0 if wait should be forever.

Definition at line 857 of file net.h.

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Macros

Typedefs

Enumerations

Functions

Detailed Description

Macro Definition Documentation

◆ COAP_RUN_BLOCK

◆ COAP_RUN_NONBLOCK

Function Documentation

◆ coap_read()

◆ coap_run_once()

◆ coap_write()