libcoap  4.3.0
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1 /*
2  * coap_context_internal.h -- Structures, Enums & Functions that are not
3  * exposed to application programming
4  *
5  * Copyright (C) 2010-2021 Olaf Bergmann <>
6  *
7  * SPDX-License-Identifier: BSD-2-Clause
8  *
9  * This file is part of the CoAP library libcoap. Please see README for terms
10  * of use.
11  */
31 struct coap_queue_t {
32  struct coap_queue_t *next;
34  unsigned char retransmit_cnt;
36  unsigned int timeout;
40 };
57 #ifndef WITHOUT_ASYNC
61 #endif /* WITHOUT_ASYNC */
71 #ifdef WITH_CONTIKI
72  struct uip_udp_conn *conn;
73  struct etimer retransmit_timer;
75  struct etimer notify_timer;
76 #endif /* WITH_CONTIKI */
78 #ifdef WITH_LWIP
79  uint8_t timer_configured;
82 #endif /* WITH_LWIP */
95  ssize_t (*network_send)(coap_socket_t *sock, const coap_session_t *session,
96  const uint8_t *data, size_t datalen);
98  ssize_t (*network_read)(coap_socket_t *sock, coap_packet_t *packet);
100  size_t(*get_client_psk)(const coap_session_t *session, const uint8_t *hint,
101  size_t hint_len, uint8_t *identity,
102  size_t *identity_len, size_t max_identity_len,
103  uint8_t *psk, size_t max_psk_len);
104  size_t(*get_server_psk)(const coap_session_t *session,
105  const uint8_t *identity, size_t identity_len,
106  uint8_t *psk, size_t max_psk_len);
107  size_t(*get_server_hint)(const coap_session_t *session, uint8_t *hint,
108  size_t max_hint_len);
115  unsigned int session_timeout;
118  unsigned int max_idle_sessions;
121  unsigned int max_handshake_sessions;
124  unsigned int ping_timeout;
127  unsigned int csm_timeout;
129  uint8_t observe_pending;
130  uint8_t block_mode;
131  uint64_t etag;
138  void *app;
140  int epfd;
141  int eptimerfd;
142  coap_tick_t next_timeout;
143 #endif /* COAP_EPOLL_SUPPORT */
144 };
154 int coap_insert_node(coap_queue_t **queue, coap_queue_t *node);
163 int coap_delete_node(coap_queue_t *node);
172 void coap_delete_all(coap_queue_t *queue);
186 unsigned int coap_adjust_basetime(coap_context_t *ctx, coap_tick_t now);
222 int coap_handle_dgram(coap_context_t *ctx, coap_session_t *session, uint8_t *data, size_t data_len);
241  coap_session_t *session,
242  coap_mid_t id,
243  coap_queue_t **node);
246 coap_wait_ack( coap_context_t *context, coap_session_t *session,
247  coap_queue_t *node);
259  coap_session_t *session,
260  const uint8_t *token,
261  size_t token_length);
270 void
272  coap_session_t *session,
273  coap_nack_reason_t reason);
278 void coap_dispatch(coap_context_t *context, coap_session_t *session,
279  coap_pdu_t *pdu);
313  coap_pdu_t *pdu,
314  coap_opt_filter_t *unknown);
328  coap_session_t *session,
329  coap_pdu_t *request);
344 unsigned int coap_calc_timeout(coap_session_t *session, unsigned char r);
365 #endif /* COAP_NET_INTERNAL_H_ */
Definition: coap_io.h:64
uint64_t coap_tick_t
This data type represents internal timer ticks with COAP_TICKS_PER_SECOND resolution.
Definition: coap_time.h:122
void(* coap_resource_release_userdata_handler_t)(void *user_data)
Definition of release resource user_data callback function.
Definition: resource.h:212
coap_queue_t * coap_peek_next(coap_context_t *context)
Returns the next pdu to send without removing from sendqeue.
Definition: net.c:274
unsigned int coap_adjust_basetime(coap_context_t *ctx, coap_tick_t now)
Set sendqueue_basetime in the given context object ctx to now.
Definition: net.c:157
void coap_delete_all(coap_queue_t *queue)
Removes all items from given queue and frees the allocated storage.
Definition: net.c:251
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.
Definition: net.c:1935
int coap_delete_node(coap_queue_t *node)
Destroys specified node.
Definition: net.c:231
coap_queue_t * coap_new_node(void)
Creates a new node suitable for adding to the CoAP sendqueue.
Definition: net.c:260
coap_queue_t * coap_pop_next(coap_context_t *context)
Returns the next pdu to send and removes it from the sendqeue.
Definition: net.c:282
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.
Definition: net.c:2188
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: net.c:2980
coap_mid_t coap_send_internal(coap_session_t *session, coap_pdu_t *pdu)
Sends a CoAP message to given peer.
Definition: net.c:1154
int coap_insert_node(coap_queue_t **queue, coap_queue_t *node)
Adds node to given queue, ordered by variable t in node.
Definition: net.c:194
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',...
Definition: net.c:947
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.
Definition: net.c:700
coap_mid_t coap_retransmit(coap_context_t *context, coap_queue_t *node)
Handles retransmissions of confirmable messages.
Definition: net.c:1337
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.
Definition: net.c:2016
coap_mid_t coap_wait_ack(coap_context_t *context, coap_session_t *session, coap_queue_t *node)
Definition: net.c:973
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.
Definition: net.c:1979
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.
Definition: net.c:1898
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.
Definition: net.h:90
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.
Definition: net.h:54
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.
Definition: net.h:79
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.
Definition: net.h:67
int(* coap_event_handler_t)(coap_session_t *session, const coap_event_t event)
Type for event handler functions that can be registered with a CoAP context using the unction coap_se...
Definition: coap_event.h:63
int coap_mid_t
coap_mid_t is used to store the CoAP Message ID of a CoAP PDU.
Definition: pdu.h:231
The CoAP stack's global state is stored in a coap_context_t object.
coap_tick_t sendqueue_basetime
The time stamp in the first element of the sendqeue is relative to sendqueue_basetime.
coap_pong_handler_t pong_handler
uint64_t etag
Next ETag to use.
unsigned int csm_timeout
Timeout for waiting for a CSM from the remote side.
void * app
application-specific data
coap_async_t * async_state
list of asynchronous message ids
coap_session_t * sessions
client sessions
coap_nack_handler_t nack_handler
unsigned int ping_timeout
Minimum inactivity time before sending a ping message.
size_t(* get_server_psk)(const coap_session_t *session, const uint8_t *identity, size_t identity_len, uint8_t *psk, size_t max_psk_len)
coap_resource_t * resources
hash table or list of known resources
ssize_t(* network_send)(coap_socket_t *sock, const coap_session_t *session, const uint8_t *data, size_t datalen)
uint16_t * cache_ignore_options
CoAP options to ignore when creating a cache-key.
coap_opt_filter_t known_options
coap_resource_release_userdata_handler_t release_userdata
function to release user_data when resource is deleted
coap_ping_handler_t ping_handler
size_t cache_ignore_count
The number of CoAP options to ignore when creating a cache-key.
unsigned int max_handshake_sessions
Maximum number of simultaneous negotating sessions per endpoint.
coap_queue_t * sendqueue
coap_response_handler_t response_handler
coap_cache_entry_t * cache
CoAP cache-entry cache.
uint8_t observe_pending
Observe response pending.
coap_endpoint_t * endpoint
the endpoints used for listening
size_t(* get_server_hint)(const coap_session_t *session, uint8_t *hint, size_t max_hint_len)
coap_event_handler_t handle_event
Callback function that is used to signal events to the application.
unsigned int session_timeout
Number of seconds of inactivity after which an unused session will be closed.
ssize_t(* network_read)(coap_socket_t *sock, coap_packet_t *packet)
size_t(* get_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)
coap_resource_t * proxy_uri_resource
can be used for handling proxy URI resources
coap_dtls_spsk_t spsk_setup_data
Contains the initial PSK server setup data.
uint8_t block_mode
Zero or more COAP_BLOCK_ or'd options.
coap_resource_t * unknown_resource
can be used for handling unknown resources
unsigned int max_idle_sessions
Maximum number of simultaneous unused sessions per endpoint.
The structure used for defining the Server PSK setup data to be used.
Definition: coap_dtls.h:425
Abstraction of virtual endpoint that can be attached to coap_context_t.
structure for CoAP PDUs token, if any, follows the fixed size header, then options until payload mark...
Queue entry.
coap_session_t * session
the CoAP session
coap_pdu_t * pdu
the CoAP PDU to send
unsigned int timeout
the randomized timeout value
struct coap_queue_t * next
coap_mid_t id
CoAP message id.
coap_tick_t t
when to send PDU for the next time
unsigned char retransmit_cnt
retransmission counter, will be removed when zero
Abstraction of resource that can be attached to coap_context_t.
Abstraction of virtual session that can be attached to coap_context_t (client) or coap_endpoint_t (se...