CoAP context functions. More...

#include "coap3/coap_internal.h"
#include <ctype.h>
#include <stdio.h>
#include <errno.h>

Include dependency graph for net.c:

Macros
#define	INET6_ADDRSTRLEN 40

#define	min(a, b) ((a) < (b) ? (a) : (b))

#define	FRAC_BITS 6
	The number of bits for the fractional part of ACK_TIMEOUT and ACK_RANDOM_FACTOR. More...

#define	MAX_BITS 8
	The maximum number of bits for fixed point integers that are used for retransmission time calculation. More...

#define	Q(frac, fval)
	creates a Qx.frac from fval in coap_fixed_point_t More...

#define	ACK_RANDOM_FACTOR Q(FRAC_BITS, session->ack_random_factor)
	creates a Qx.FRAC_BITS from session's 'ack_random_factor' More...

#define	ACK_TIMEOUT Q(FRAC_BITS, session->ack_timeout)
	creates a Qx.FRAC_BITS from session's 'ack_timeout' More...

#define	FP1 Q(FRAC_BITS, ((coap_fixed_point_t){1,0}))

#define	SHR_FP(val, frac) (((val) + (1 << ((frac) - 1))) >> (frac))

Functions
COAP_STATIC_INLINE coap_queue_t *	coap_malloc_node (void)

COAP_STATIC_INLINE void	coap_free_node (coap_queue_t *node)

unsigned int	coap_adjust_basetime (coap_context_t *ctx, coap_tick_t now)
	Set sendqueue_basetime in the given context object `ctx` to `now`. More...

int	coap_insert_node (coap_queue_t *queue, coap_queue_t node)
	Adds `node` to given `queue`, ordered by variable t in `node`. More...

int	coap_delete_node (coap_queue_t *node)
	Destroys specified `node`. More...

void	coap_delete_all (coap_queue_t *queue)
	Removes all items from given `queue` and frees the allocated storage. More...

coap_queue_t *	coap_new_node (void)
	Creates a new node suitable for adding to the CoAP sendqueue. More...

coap_queue_t *	coap_peek_next (coap_context_t *context)
	Returns the next pdu to send without removing from sendqeue. More...

coap_queue_t *	coap_pop_next (coap_context_t *context)
	Returns the next pdu to send and removes it from the sendqeue. More...

const coap_bin_const_t *	coap_get_session_client_psk_identity (const coap_session_t *session)
	Get the current client's PSK identity. More...

int	coap_context_set_pki_root_cas (coap_context_t ctx, 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...

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_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...

void	coap_context_set_csm_timeout (coap_context_t *context, unsigned int csm_timeout)
	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_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...

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...

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...

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

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

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

int	coap_option_check_critical (coap_session_t session, coap_pdu_t pdu, coap_opt_filter_t *unknown)
	Verifies that `pdu` contains no unknown critical options. 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...

ssize_t	coap_session_send_pdu (coap_session_t session, coap_pdu_t pdu)
	Send a pdu according to the session's protocol. More...

static ssize_t	coap_send_pdu (coap_session_t session, coap_pdu_t pdu, coap_queue_t *node)

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...

unsigned int	coap_calc_timeout (coap_session_t *session, unsigned char r)
	Calculates the initial timeout based on the session CoAP transmission parameters 'ack_timeout', 'ack_random_factor', and COAP_TICKS_PER_SECOND. More...

coap_mid_t	coap_wait_ack (coap_context_t context, coap_session_t session, coap_queue_t *node)

COAP_STATIC_INLINE int	token_match (const uint8_t a, size_t alen, const uint8_t b, size_t blen)

int	coap_client_delay_first (coap_session_t *session)
	Delay the sending of the first client request until some other negotiation has completed. More...

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

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

coap_mid_t	coap_retransmit (coap_context_t context, coap_queue_t node)
	Handles retransmissions of confirmable messages. More...

static int	coap_handle_dgram_for_proto (coap_context_t ctx, coap_session_t session, coap_packet_t *packet)

static void	coap_write_session (coap_context_t ctx, coap_session_t session, coap_tick_t now)

static void	coap_read_session (coap_context_t ctx, coap_session_t session, coap_tick_t now)

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...

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

int	coap_handle_dgram (coap_context_t ctx, coap_session_t session, uint8_t *msg, size_t msg_len)
	Parses and interprets a CoAP datagram with context `ctx`. More...

int	coap_remove_from_queue (coap_queue_t *queue, coap_session_t session, coap_mid_t id, coap_queue_t **node)
	This function removes the element with given `id` from the list given list. More...

void	coap_cancel_session_messages (coap_context_t context, coap_session_t session, coap_nack_reason_t reason)
	Cancels all outstanding messages for session `session`. More...

void	coap_cancel_all_messages (coap_context_t context, coap_session_t session, const uint8_t *token, size_t token_length)
	Cancels all outstanding messages for session `session` that have the specified token. 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...

static int	coap_cancel (coap_context_t context, const coap_queue_t sent)
	This function cancels outstanding messages for the session and token specified in `sent`. More...

static void	handle_signaling (coap_context_t context, coap_session_t session, coap_pdu_t *pdu)

void	coap_dispatch (coap_context_t context, coap_session_t session, coap_pdu_t *pdu)
	Dispatches the PDUs from the receive queue in given context. 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...

coap_tick_t	coap_check_async (coap_context_t *context, coap_tick_t now)
	Checks if there are any pending Async requests - if so, send them off. More...

void	coap_startup (void)

void	coap_cleanup (void)

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...

Variables
static int	coap_started = 0

Detailed Description

CoAP context functions.

Definition in file net.c.

Macro Definition Documentation

◆ ACK_RANDOM_FACTOR

#define ACK_RANDOM_FACTOR Q(FRAC_BITS, session->ack_random_factor)

creates a Qx.FRAC_BITS from session's 'ack_random_factor'

Definition at line 96 of file net.c.

◆ ACK_TIMEOUT

#define ACK_TIMEOUT Q(FRAC_BITS, session->ack_timeout)

creates a Qx.FRAC_BITS from session's 'ack_timeout'

Definition at line 100 of file net.c.

◆ FP1

#define FP1 Q(FRAC_BITS, ((coap_fixed_point_t){1,0}))

◆ FRAC_BITS

#define FRAC_BITS 6

The number of bits for the fractional part of ACK_TIMEOUT and ACK_RANDOM_FACTOR.

Must be less or equal 8.

Definition at line 79 of file net.c.

◆ INET6_ADDRSTRLEN

#define INET6_ADDRSTRLEN 40

Definition at line 68 of file net.c.

◆ MAX_BITS

#define MAX_BITS 8

The maximum number of bits for fixed point integers that are used for retransmission time calculation.

Currently this must be 8.

Definition at line 85 of file net.c.

◆ min

#define min	(	a,
		b
	)	((a) < (b) ? (a) : (b))

Definition at line 72 of file net.c.

◆ Q

#define Q	(	frac,
		fval
	)

Value:

((uint16_t)(((1 << (frac)) * fval.integer_part) + \

((1 << (frac)) * fval.fractional_part + 500)/1000))

creates a Qx.frac from fval in coap_fixed_point_t

Definition at line 92 of file net.c.

◆ SHR_FP

#define SHR_FP	(	val,
		frac
	)	(((val) + (1 << ((frac) - 1))) >> (frac))

Function Documentation

◆ coap_cancel()

static int coap_cancel	(	coap_context_t *	context,
		const coap_queue_t *	sent
	)

static

This function cancels outstanding messages for the session and token specified in sent.

Any observation relationship for sent->session and the token are removed. Calling this function is required when receiving an RST message (usually in response to a notification) or a GET request with the Observe option set to 1.

This function returns 0 when the token is unknown with this peer, or a value greater than zero otherwise.

Definition at line 2400 of file net.c.

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◆ coap_cleanup()

void coap_cleanup ( void )

Definition at line 3483 of file net.c.

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◆ coap_free_node()

COAP_STATIC_INLINE void coap_free_node ( coap_queue_t * node )

Definition at line 110 of file net.c.

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◆ coap_handle_dgram_for_proto()

static int coap_handle_dgram_for_proto	(	coap_context_t *	ctx,
		coap_session_t *	session,
		coap_packet_t *	packet
	)

static

Definition at line 1532 of file net.c.

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◆ coap_malloc_node()

COAP_STATIC_INLINE coap_queue_t * coap_malloc_node ( void )

Definition at line 105 of file net.c.

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◆ coap_read_session()

static void coap_read_session	(	coap_context_t *	ctx,
		coap_session_t *	session,
		coap_tick_t	now
	)

static

Definition at line 1643 of file net.c.

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◆ coap_send_pdu()

static ssize_t coap_send_pdu	(	coap_session_t *	session,
		coap_pdu_t *	pdu,
		coap_queue_t *	node
	)

static

Definition at line 821 of file net.c.

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◆ coap_startup()

void coap_startup ( void )

Definition at line 3454 of file net.c.

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◆ coap_write_session()

static void coap_write_session	(	coap_context_t *	ctx,
		coap_session_t *	session,
		coap_tick_t	now
	)

static

Definition at line 1593 of file net.c.

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◆ handle_signaling()

static void handle_signaling	(	coap_context_t *	context,
		coap_session_t *	session,
		coap_pdu_t *	pdu
	)

static

Definition at line 3141 of file net.c.

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◆ token_match()

COAP_STATIC_INLINE int token_match	(	const uint8_t *	a,
		size_t	alen,
		const uint8_t *	b,
		size_t	blen
	)

Definition at line 1031 of file net.c.

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Variable Documentation

◆ coap_started

int coap_started = 0

static

Definition at line 3452 of file net.c.

Macros

Functions

Variables

Detailed Description

Macro Definition Documentation

◆ ACK_RANDOM_FACTOR

◆ ACK_TIMEOUT

◆ FP1

◆ FRAC_BITS

◆ INET6_ADDRSTRLEN

◆ MAX_BITS

◆ min

◆ Q

◆ SHR_FP

Function Documentation

◆ coap_cancel()

◆ coap_cleanup()

◆ coap_free_node()

◆ coap_handle_dgram_for_proto()

◆ coap_malloc_node()

◆ coap_read_session()

◆ coap_send_pdu()

◆ coap_startup()

◆ coap_write_session()

◆ handle_signaling()

◆ token_match()

Variable Documentation

◆ coap_started