#include "coap_config.h"
#include <ctype.h>
#include <stdio.h>
#include <errno.h>
#include "libcoap.h"
#include "utlist.h"
#include "coap_debug.h"
#include "mem.h"
#include "str.h"
#include "async.h"
#include "resource.h"
#include "option.h"
#include "encode.h"
#include "block.h"
#include "net.h"

Include dependency graph for net.c:

Macros
#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))

#define	SZX_TO_BYTES(SZX) ((size_t)(1 << ((SZX) + 4)))

#define	INET6_ADDRSTRLEN 40

Enumerations
enum	respond_t { RESPONSE_DEFAULT, RESPONSE_DROP, RESPONSE_SEND }
	Internal flags to control the treatment of responses (specifically in presence of the No-Response option). More...

Functions
COAP_STATIC_INLINE coap_queue_t *	coap_malloc_node (void)

COAP_STATIC_INLINE void	coap_free_node (coap_queue_t *node)

void	coap_free_endpoint (coap_endpoint_t *ep)

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...

static size_t	coap_get_session_client_psk (const coap_session_t session, const uint8_t hint, size_t hint_len, uint8_t identity, size_t identity_len, size_t max_identity_len, uint8_t *psk, size_t max_psk_len)

static size_t	coap_get_context_server_psk (const coap_session_t session, const uint8_t identity, size_t identity_len, uint8_t *psk, size_t max_psk_len)

static size_t	coap_get_context_server_hint (const coap_session_t session, uint8_t hint, size_t max_hint_len)

int	coap_context_set_psk (coap_context_t ctx, 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_pki (coap_context_t ctx, 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 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...

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_context_t ctx, coap_pdu_t pdu, coap_opt_filter_t unknown)
	Verifies that `pdu` contains no unknown critical options. More...

coap_tid_t	coap_send_ack (coap_session_t session, 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_tid_t	coap_send_error (coap_session_t session, coap_pdu_t request, unsigned char code, coap_opt_filter_t opts)
	Sends an error response with code `code` for request `request` to `dst`. More...

coap_tid_t	coap_send_message_type (coap_session_t session, coap_pdu_t request, unsigned char type)
	Helper funktion 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_tid_t	coap_wait_ack (coap_context_t context, coap_session_t session, coap_queue_t *node)

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

coap_tid_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_connect_session (coap_context_t ctx, coap_session_t session, coap_tick_t now)

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)

static int	coap_read_endpoint (coap_context_t ctx, coap_endpoint_t endpoint, coap_tick_t now)

static int	coap_write_endpoint (coap_context_t ctx, coap_endpoint_t endpoint, coap_tick_t now)

static int	coap_accept_endpoint (coap_context_t ctx, coap_endpoint_t endpoint, coap_tick_t now)

void	coap_read (coap_context_t *ctx, coap_tick_t now)
	For applications with their own message loop, reads all data from the network. 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_tid_t id, coap_queue_t **node)
	This function removes the element with given `id` from the list given list. More...

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

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_queue_t *	coap_find_transaction (coap_queue_t queue, coap_session_t session, coap_tid_t id)
	Retrieves transaction from the queue. More...

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

COAP_STATIC_INLINE size_t	get_wkc_len (coap_context_t context, coap_opt_t query_filter)
	Quick hack to determine the size of the resource description for .well-known/core. More...

coap_pdu_t *	coap_wellknown_response (coap_context_t context, coap_session_t session, coap_pdu_t *request)
	Creates a new response for given `request` with the contents of .well-known/core. 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 enum respond_t	no_response (coap_pdu_t request, coap_pdu_t response)
	Checks for No-Response option in given `request` and returns `1` if `response` should be suppressed according to RFC 7967. More...

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

static void	handle_response (coap_context_t context, coap_session_t session, coap_pdu_t sent, coap_pdu_t rcvd)

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...

void	coap_startup (void)

void	coap_cleanup (void)

Variables
static coap_str_const_t	coap_default_uri_wellknown

static int	coap_started = 0

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 82 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 86 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 65 of file net.c.

◆ INET6_ADDRSTRLEN

#define INET6_ADDRSTRLEN 40

◆ 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 71 of file net.c.

◆ min

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

Definition at line 58 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 78 of file net.c.

◆ SHR_FP

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

◆ SZX_TO_BYTES

#define SZX_TO_BYTES ( SZX ) ((size_t)(1 << ((SZX) + 4)))

Definition at line 1646 of file net.c.

Enumeration Type Documentation

◆ respond_t

enum respond_t

Internal flags to control the treatment of responses (specifically in presence of the No-Response option).

Enumerator
RESPONSE_DEFAULT
RESPONSE_DROP
RESPONSE_SEND

Definition at line 1812 of file net.c.

Function Documentation

◆ coap_accept_endpoint()

static int coap_accept_endpoint	(	coap_context_t *	ctx,
		coap_endpoint_t *	endpoint,
		coap_tick_t	now
	)

static

Definition at line 1310 of file net.c.

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◆ coap_adjust_basetime()

unsigned int coap_adjust_basetime	(	coap_context_t *	ctx,
		coap_tick_t	now
	)

Set sendqueue_basetime in the given context object ctx to now.

This function returns the number of elements in the queue head that have timed out.

Definition at line 151 of file net.c.

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◆ coap_calc_timeout()

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.

The calculation requires 'ack_timeout' and 'ack_random_factor' to be in Qx.FRAC_BITS fixed point notation, whereas the passed parameter r is interpreted as the fractional part of a Q0.MAX_BITS random value.

Parameters

session	session timeout is associated with
r	random value as fractional part of a Q0.MAX_BITS fixed point value

Returns: COAP_TICKS_PER_SECOND * 'ack_timeout' * (1 + ('ack_random_factor' - 1) * r)

Definition at line 798 of file net.c.

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◆ coap_can_exit()

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.

Definition at line 2321 of file net.c.

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◆ 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 1786 of file net.c.

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◆ coap_cancel_all_messages()

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.

Parameters

context	The context in use.
session	Session of the messages to remove.
token	Message token.
token_length	Actual length of `token`.

Definition at line 1484 of file net.c.

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◆ coap_cancel_session_messages()

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.

Parameters

context	The context in use.
session	Session of the messages to remove.
reason	The reasion for the session cancellation

Definition at line 1447 of file net.c.

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◆ coap_cleanup()

void coap_cleanup ( void )

Definition at line 2363 of file net.c.

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◆ coap_connect_session()

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

static

Definition at line 1043 of file net.c.

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◆ coap_context_set_keepalive()

void coap_context_set_keepalive	(	coap_context_t *	context,
		unsigned int	seconds
	)

Set the context keepalive timer for sessions.

A keepalive message will be sent after if a session has been inactive, i.e. no packet sent or received, for the given number of seconds. For reliable protocols, a PING message will be sent. If a PONG has not been received before the next PING is due to be sent, the session will considered as disconnected.

Parameters

context	The coap_context_t object.
seconds	Number of seconds for the inactivity timer, or zero to disable CoAP-level keepalive messages.

Returns: 1 if successful, else 0

Definition at line 417 of file net.c.

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◆ coap_context_set_pki()

int coap_context_set_pki	(	coap_context_t *	context,
		coap_dtls_pki_t *	setup_data
	)

Set the context's default PKI information for a server.

Parameters

context	The current coap_context_t object.
setup_data	If `NULL`, PKI authentication will fail. Certificate information required.

Returns: 1 if successful, else 0.

Definition at line 392 of file net.c.

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◆ coap_context_set_pki_root_cas()

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.

Parameters

context	The current coap_context_t object.
ca_file	If not `NULL`, is the full path name of a PEM encoded file containing all the Root CAs to be used.
ca_dir	If not `NULL`, points to a directory containing PEM encoded files containing all the Root CAs to be used.

Returns: 1 if successful, else 0.

Definition at line 407 of file net.c.

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◆ coap_context_set_psk()

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.

Parameters

context	The current coap_context_t object.
hint	The default PSK server hint sent to a client. If `NULL`, PSK authentication is disabled. Empty string is a valid hint.
key	The default PSK key. If `NULL`, PSK authentication will fail.
key_len	The default PSK key's length. If `0`, PSK authentication will fail.

Returns: 1 if successful, else 0.

Definition at line 349 of file net.c.

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◆ coap_delete_all()

void coap_delete_all ( coap_queue_t * queue )

Removes all items from given queue and frees the allocated storage.

Parameters

queue The queue to delete.

Definition at line 245 of file net.c.

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◆ coap_delete_node()

int coap_delete_node ( coap_queue_t * node )

Destroys specified node.

Parameters

node	Node entry to remove.

Returns: 1 node deleted from queue, 0 failure.

Definition at line 225 of file net.c.

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◆ coap_dispatch()

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.

Definition at line 2169 of file net.c.

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◆ coap_find_transaction()

coap_queue_t* coap_find_transaction	(	coap_queue_t *	queue,
		coap_session_t *	session,
		coap_tid_t	id
	)

Retrieves transaction from the queue.

Parameters

queue	The transaction queue to be searched.
session	The session to find.
id	The transaction id to find.

Returns: A pointer to the transaction object or NULL if not found.

Definition at line 1525 of file net.c.

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◆ coap_free_context()

void coap_free_context ( coap_context_t * context )

CoAP stack context must be released with coap_free_context().

This function clears all entries from the receive queue and send queue and deletes the resources that have been registered with context, and frees the attached endpoints.

Parameters

context The current coap_context_t object to free off.

Definition at line 518 of file net.c.

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◆ coap_free_endpoint()

void coap_free_endpoint ( coap_endpoint_t * ep )

Definition at line 901 of file coap_session.c.

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◆ coap_free_node()

COAP_STATIC_INLINE void coap_free_node ( coap_queue_t * node )

Definition at line 96 of file net.c.

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◆ coap_get_app_data()

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().

This function will return NULL if no data has been stored.

Parameters

context The CoAP context.

Returns: The data previously stored or NULL if not data stored.

Definition at line 512 of file net.c.

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◆ coap_get_context_server_hint()

static size_t coap_get_context_server_hint	(	const coap_session_t *	session,
		uint8_t *	hint,
		size_t	max_hint_len
	)

static

Definition at line 337 of file net.c.

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◆ coap_get_context_server_psk()

static size_t coap_get_context_server_psk	(	const coap_session_t *	session,
		const uint8_t *	identity,
		size_t	identity_len,
		uint8_t *	psk,
		size_t	max_psk_len
	)

static

Definition at line 321 of file net.c.

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◆ coap_get_session_client_psk()

static size_t coap_get_session_client_psk	(	const coap_session_t *	session,
		const uint8_t *	hint,
		size_t	hint_len,
		uint8_t *	identity,
		size_t *	identity_len,
		size_t	max_identity_len,
		uint8_t *	psk,
		size_t	max_psk_len
	)

static

Definition at line 294 of file net.c.

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◆ coap_handle_dgram()

int coap_handle_dgram	(	coap_context_t *	ctx,
		coap_session_t *	session,
		uint8_t *	data,
		size_t	data_len
	)

Parses and interprets a CoAP datagram with context ctx.

This function returns 0 if the datagram was handled, or a value less than zero on error.

Parameters

ctx	The current CoAP context.
session	The current CoAP session.
data	The received packet'd data.
data_len	The received packet'd data length.

Returns: 0 if message was handled successfully, or less than zero on error.

Definition at line 1369 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 1024 of file net.c.

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◆ coap_handle_event()

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.

Parameters

context	The CoAP context whose event handler is to be called.
event	The event to deliver.
session	The session related to `event`.

Returns: The result from the associated event handler or 0 if none was registered.

Definition at line 2310 of file net.c.

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◆ coap_insert_node()

int coap_insert_node	(	coap_queue_t **	queue,
		coap_queue_t *	node
	)

Adds node to given queue, ordered by variable t in node.

Parameters

queue	Queue to add to.
node	Node entry to add to Queue.

Returns: 1 added to queue, 0 failure.

Definition at line 188 of file net.c.

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◆ coap_malloc_node()

COAP_STATIC_INLINE coap_queue_t* coap_malloc_node ( void )

Definition at line 91 of file net.c.

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◆ coap_new_context()

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.

Definition at line 422 of file net.c.

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◆ coap_new_error_response()

coap_pdu_t* coap_new_error_response	(	coap_pdu_t *	request,
		unsigned char	code,
		coap_opt_filter_t	opts
	)

Creates a new ACK PDU with specified error code.

The options specified by the filter expression opts will be copied from the original request contained in request. Unless SHORT_ERROR_RESPONSE was defined at build time, the textual reason phrase for code will be added as payload, with Content-Type 0. This function returns a pointer to the new response message, or NULL on error. The storage allocated for the new message must be relased with coap_free().

Parameters

request	Specification of the received (confirmable) request.
code	The error code to set.
opts	An option filter that specifies which options to copy from the original request in `node`.

Returns: A pointer to the new message or NULL on error.

Definition at line 1533 of file net.c.

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◆ coap_new_node()

coap_queue_t* coap_new_node ( void )

Creates a new node suitable for adding to the CoAP sendqueue.

Returns: New node entry, or NULL if failure.

Definition at line 254 of file net.c.

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◆ coap_option_check_critical()

int coap_option_check_critical	(	coap_context_t *	ctx,
		coap_pdu_t *	pdu,
		coap_opt_filter_t	unknown
	)

Verifies that pdu contains no unknown critical options.

Options must be registered at ctx, using the function coap_register_option(). A basic set of options is registered automatically by coap_new_context(). This function returns 1 if pdu is ok, 0 otherwise. The given filter object unknown will be updated with the unknown options. As only COAP_MAX_OPT options can be signalled this way, remaining options must be examined manually.

coap_opt_filter_t f = COAP_OPT_NONE;
coap_opt_iterator_t opt_iter;
if (coap_option_check_critical(ctx, pdu, f) == 0) {
  coap_option_iterator_init(pdu, &opt_iter, f);
  while (coap_option_next(&opt_iter)) {
    if (opt_iter.type & 0x01) {
      ... handle unknown critical option in opt_iter ...
    }
  }
}

Parameters

ctx	The context where all known options are registered.
pdu	The PDU to check.
unknown	The output filter that will be updated to indicate the unknown critical options found in `pdu`.

Returns: 1 if everything was ok, 0 otherwise.

Definition at line 561 of file net.c.

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◆ coap_peek_next()

coap_queue_t* coap_peek_next ( coap_context_t * context )

Returns the next pdu to send without removing from sendqeue.

Definition at line 270 of file net.c.

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◆ coap_pop_next()

coap_queue_t* coap_pop_next ( coap_context_t * context )

Returns the next pdu to send and removes it from the sendqeue.

Definition at line 278 of file net.c.

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◆ coap_read()

void coap_read	(	coap_context_t *	ctx,
		coap_tick_t	now
	)

For applications with their own message loop, reads all data from the network.

Parameters

ctx	The CoAP context
now	Current time

Definition at line 1319 of file net.c.

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◆ coap_read_endpoint()

static int coap_read_endpoint	(	coap_context_t *	ctx,
		coap_endpoint_t *	endpoint,
		coap_tick_t	now
	)

static

Definition at line 1256 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 1126 of file net.c.

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◆ coap_remove_from_queue()

int coap_remove_from_queue	(	coap_queue_t **	queue,
		coap_session_t *	session,
		coap_tid_t	id,
		coap_queue_t **	node
	)

This function removes the element with given id from the list given list.

If id was found, node is updated to point to the removed element. Note that the storage allocated by node is not released. The caller must do this manually using coap_delete_node(). This function returns 1 if the element with id id was found, 0 otherwise. For a return value of 0, the contents of node is undefined.

Parameters

queue	The queue to search for `id`.
session	The session to look for.
id	The transaction id to look for.
node	If found, `node` is updated to point to the removed node. You must release the storage pointed to by `node` manually.

Returns: 1 if id was found, 0 otherwise.

Definition at line 1397 of file net.c.

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◆ coap_retransmit()

coap_tid_t coap_retransmit	(	coap_context_t *	context,
		coap_queue_t *	node
	)

Handles retransmissions of confirmable messages.

Parameters

context	The CoAP context.
node	The node to retransmit.

Returns: The message id of the sent message or COAP_INVALID_TID on error.

Definition at line 931 of file net.c.

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◆ coap_send()

coap_tid_t coap_send	(	coap_session_t *	session,
		coap_pdu_t *	pdu
	)

Sends a CoAP message to given peer.

The memory that is allocated by pdu will be released by coap_send(). The caller must not use the pdu after calling coap_send().

Parameters

session	The CoAP session.
pdu	The CoAP PDU to send.

Returns: The message id of the sent message or COAP_INVALID_TID on error.

Definition at line 876 of file net.c.

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◆ coap_send_ack()

coap_tid_t coap_send_ack	(	coap_session_t *	session,
		coap_pdu_t *	request
	)

Sends an ACK message with code 0 for the specified request to dst.

This function returns the corresponding transaction id if the message was sent or COAP_INVALID_TID on error.

Parameters

session	The CoAP session.
request	The request to be acknowledged.

Returns: The transaction id if ACK was sent or COAP_INVALID_TID on error.

Definition at line 613 of file net.c.

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◆ coap_send_error()

coap_tid_t coap_send_error	(	coap_session_t *	session,
		coap_pdu_t *	request,
		unsigned char	code,
		coap_opt_filter_t	opts
	)

Sends an error response with code code for request request to dst.

opts will be passed to coap_new_error_response() to copy marked options from the request. This function returns the transaction id if the message was sent, or COAP_INVALID_TID otherwise.

Parameters

session	The CoAP session.
request	The original request to respond to.
code	The response code.
opts	A filter that specifies the options to copy from the `request`.

Returns: The transaction id if the message was sent, or COAP_INVALID_TID otherwise.

Definition at line 754 of file net.c.

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◆ coap_send_message_type()

coap_tid_t coap_send_message_type	(	coap_session_t *	session,
		coap_pdu_t *	request,
		unsigned char	type
	)

Helper funktion to create and send a message with type (usually ACK or RST).

This function returns COAP_INVALID_TID when the message was not sent, a valid transaction id otherwise.

Parameters

session	The CoAP session.
request	The request that should be responded to.
type	Which type to set.

Returns: transaction id on success or COAP_INVALID_TID otherwise.

Definition at line 772 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 655 of file net.c.

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◆ coap_session_send_pdu()

ssize_t coap_session_send_pdu	(	coap_session_t *	session,
		coap_pdu_t *	pdu
	)

Send a pdu according to the session's protocol.

This function returns the number of bytes that have been transmitted, or a value less than zero on error.

Parameters

session	Session to send pdu on.
pdu	The pdu to send.

Returns: The number of bytes written on success, or a value less than zero on error.

Definition at line 627 of file net.c.

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◆ coap_set_app_data()

void coap_set_app_data	(	coap_context_t *	context,
		void *	data
	)

Stores data with the given CoAP context.

This function overwrites any value that has previously been stored with context.

Parameters

context	The CoAP context.
data	The data to store with wih the context. Note that this data must be valid during the lifetime of `context`.

Definition at line 506 of file net.c.

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◆ coap_startup()

void coap_startup ( void )

Definition at line 2343 of file net.c.

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◆ coap_wait_ack()

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

Definition at line 824 of file net.c.

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◆ coap_wellknown_response()

coap_pdu_t* coap_wellknown_response	(	coap_context_t *	context,
		coap_session_t *	session,
		coap_pdu_t *	request
	)

Creates a new response for given request with the contents of .well-known/core.

The result is NULL on error or a newly allocated PDU that must be either sent with coap_sent() or released by coap_delete_pdu().

Parameters

context	The current coap context to use.
session	The CoAP session.
request	The request for .well-known/core .

Returns: A new 2.05 response for .well-known/core or NULL on error.

Definition at line 1649 of file net.c.

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◆ coap_write_endpoint()

static int coap_write_endpoint	(	coap_context_t *	ctx,
		coap_endpoint_t *	endpoint,
		coap_tick_t	now
	)

static

Definition at line 1302 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 1071 of file net.c.

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◆ get_wkc_len()

COAP_STATIC_INLINE size_t get_wkc_len	(	coap_context_t *	context,
		coap_opt_t *	query_filter
	)

Quick hack to determine the size of the resource description for .well-known/core.

Definition at line 1631 of file net.c.

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◆ handle_request()

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

static

Definition at line 1883 of file net.c.

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◆ handle_response()

static void handle_response	(	coap_context_t *	context,
		coap_session_t *	session,
		coap_pdu_t *	sent,
		coap_pdu_t *	rcvd
	)

static

Definition at line 2111 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 2129 of file net.c.

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◆ no_response()

static enum respond_t no_response	(	coap_pdu_t *	request,
		coap_pdu_t *	response
	)

static

Checks for No-Response option in given request and returns 1 if response should be suppressed according to RFC 7967.

The value of the No-Response option is encoded as follows:

*  +-------+-----------------------+-----------------------------------+
*  | Value | Binary Representation |          Description              |
*  +-------+-----------------------+-----------------------------------+
*  |   0   |      <empty>          | Interested in all responses.      |
*  +-------+-----------------------+-----------------------------------+
*  |   2   |      00000010         | Not interested in 2.xx responses. |
*  +-------+-----------------------+-----------------------------------+
*  |   8   |      00001000         | Not interested in 4.xx responses. |
*  +-------+-----------------------+-----------------------------------+
*  |  16   |      00010000         | Not interested in 5.xx responses. |
*  +-------+-----------------------+-----------------------------------+
*

Parameters

request	The CoAP request to check for the No-Response option. This parameter must not be NULL.
response	The response that is potentially suppressed. This parameter must not be NULL.

Returns: RESPONSE_DEFAULT when no special treatment is requested, RESPONSE_DROP when the response must be discarded, or RESPONSE_SEND when the response must be sent.

Definition at line 1845 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 1441 of file net.c.

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Variable Documentation

◆ coap_default_uri_wellknown

coap_str_const_t coap_default_uri_wellknown

static

Initial value:

=
          { sizeof(COAP_DEFAULT_URI_WELLKNOWN)-1,
           (const uint8_t *)COAP_DEFAULT_URI_WELLKNOWN }

Definition at line 1878 of file net.c.

◆ coap_started

int coap_started = 0

static

Definition at line 2341 of file net.c.

Macros

Enumerations

Functions

Variables

Macro Definition Documentation

◆ ACK_RANDOM_FACTOR

◆ ACK_TIMEOUT

◆ FP1

◆ FRAC_BITS

◆ INET6_ADDRSTRLEN

◆ MAX_BITS

◆ min

◆ Q

◆ SHR_FP

◆ SZX_TO_BYTES

Enumeration Type Documentation

◆ respond_t

Function Documentation

◆ coap_accept_endpoint()

◆ coap_adjust_basetime()

◆ coap_calc_timeout()

◆ coap_can_exit()

◆ coap_cancel()

◆ coap_cancel_all_messages()

◆ coap_cancel_session_messages()

◆ coap_cleanup()

◆ coap_connect_session()

◆ coap_context_set_keepalive()

◆ coap_context_set_pki()

◆ coap_context_set_pki_root_cas()

◆ coap_context_set_psk()

◆ coap_delete_all()

◆ coap_delete_node()

◆ coap_dispatch()

◆ coap_find_transaction()

◆ coap_free_context()

◆ coap_free_endpoint()

◆ coap_free_node()

◆ coap_get_app_data()

◆ coap_get_context_server_hint()

◆ coap_get_context_server_psk()

◆ coap_get_session_client_psk()

◆ coap_handle_dgram()

◆ coap_handle_dgram_for_proto()

◆ coap_handle_event()

◆ coap_insert_node()

◆ coap_malloc_node()

◆ coap_new_context()

◆ coap_new_error_response()

◆ coap_new_node()

◆ coap_option_check_critical()

◆ coap_peek_next()

◆ coap_pop_next()

◆ coap_read()

◆ coap_read_endpoint()

◆ coap_read_session()

◆ coap_remove_from_queue()

◆ coap_retransmit()

◆ coap_send()

◆ coap_send_ack()

◆ coap_send_error()

◆ coap_send_message_type()

◆ coap_send_pdu()

◆ coap_session_send_pdu()

◆ coap_set_app_data()

◆ coap_startup()

◆ coap_wait_ack()

◆ coap_wellknown_response()

◆ coap_write_endpoint()

◆ coap_write_session()

◆ get_wkc_len()

◆ handle_request()

◆ handle_response()

◆ handle_signaling()

◆ no_response()

◆ token_match()

Variable Documentation

◆ coap_default_uri_wellknown

◆ coap_started