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arduino-esp32/tools/sdk/esp32/include/coap/libcoap/include/coap2/pdu.h
Me No Dev 5502879a5b
v2.0.0 Add support for ESP32S2 and update ESP-IDF to 4.4 (#4996) 
This is very much still work in progress and much more will change before the final 2.0.0

Some APIs have changed. New libraries have been added. LittleFS included.

Co-authored-by: Seon Rozenblum <seonr@3sprockets.com>
Co-authored-by: Me No Dev <me-no-dev@users.noreply.github.com>
Co-authored-by: geeksville <kevinh@geeksville.com>
Co-authored-by: Mike Dunston <m_dunston@comcast.net>
Co-authored-by: Unexpected Maker <seon@unexpectedmaker.com>
Co-authored-by: Seon Rozenblum <seonr@3sprockets.com>
Co-authored-by: microDev <70126934+microDev1@users.noreply.github.com>
Co-authored-by: tobozo <tobozo@users.noreply.github.com>
Co-authored-by: bobobo1618 <bobobo1618@users.noreply.github.com>
Co-authored-by: lorol <lorolouis@gmail.com>
Co-authored-by: geeksville <kevinh@geeksville.com>
Co-authored-by: Limor "Ladyada" Fried <limor@ladyada.net>
Co-authored-by: Sweety <switi.mhaiske@espressif.com>
Co-authored-by: Loick MAHIEUX <loick111@gmail.com>
Co-authored-by: Larry Bernstone <lbernstone@gmail.com>
Co-authored-by: Valerii Koval <valeros@users.noreply.github.com>
Co-authored-by: 快乐的我531 <2302004040@qq.com>
Co-authored-by: chegewara <imperiaonline4@gmail.com>
Co-authored-by: Clemens Kirchgatterer <clemens@1541.org>
Co-authored-by: Aron Rubin <aronrubin@gmail.com>
Co-authored-by: Pete Lewis <601236+lewispg228@users.noreply.github.com>
2021-04-05 14:23:58 +03:00

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/*
* pdu.h -- CoAP message structure
*
* Copyright (C) 2010-2014 Olaf Bergmann <bergmann@tzi.org>
*
* This file is part of the CoAP library libcoap. Please see README for terms
* of use.
*/
/**
* @file pdu.h
* @brief Pre-defined constants that reflect defaults for CoAP
*/
#ifndef COAP_PDU_H_
#define COAP_PDU_H_
#include "uri.h"
struct coap_session_t;
#ifdef WITH_LWIP
#include <lwip/pbuf.h>
#endif
#include <stdint.h>
#define COAP_DEFAULT_PORT 5683 /* CoAP default UDP/TCP port */
#define COAPS_DEFAULT_PORT 5684 /* CoAP default UDP/TCP port for secure transmission */
#define COAP_DEFAULT_MAX_AGE 60 /* default maximum object lifetime in seconds */
#ifndef COAP_DEFAULT_MTU
#define COAP_DEFAULT_MTU 1152
#endif /* COAP_DEFAULT_MTU */
/* TCP Message format constants, do not modify */
#define COAP_MESSAGE_SIZE_OFFSET_TCP8 13
#define COAP_MESSAGE_SIZE_OFFSET_TCP16 269 /* 13 + 256 */
#define COAP_MESSAGE_SIZE_OFFSET_TCP32 65805 /* 269 + 65536 */
/* Derived message size limits */
#define COAP_MAX_MESSAGE_SIZE_TCP0 (COAP_MESSAGE_SIZE_OFFSET_TCP8-1) /* 12 */
#define COAP_MAX_MESSAGE_SIZE_TCP8 (COAP_MESSAGE_SIZE_OFFSET_TCP16-1) /* 268 */
#define COAP_MAX_MESSAGE_SIZE_TCP16 (COAP_MESSAGE_SIZE_OFFSET_TCP32-1) /* 65804 */
#define COAP_MAX_MESSAGE_SIZE_TCP32 (COAP_MESSAGE_SIZE_OFFSET_TCP32+0xFFFFFFFF)
#ifndef COAP_DEFAULT_MAX_PDU_RX_SIZE
#if defined(WITH_CONTIKI) || defined(WITH_LWIP)
#define COAP_DEFAULT_MAX_PDU_RX_SIZE (COAP_MAX_MESSAGE_SIZE_TCP16+4)
#else
/* 8 MiB max-message-size plus some space for options */
#define COAP_DEFAULT_MAX_PDU_RX_SIZE (8*1024*1024+256)
#endif
#endif /* COAP_DEFAULT_MAX_PDU_RX_SIZE */
#ifndef COAP_DEBUG_BUF_SIZE
#if defined(WITH_CONTIKI) || defined(WITH_LWIP)
#define COAP_DEBUG_BUF_SIZE 128
#else /* defined(WITH_CONTIKI) || defined(WITH_LWIP) */
/* 1024 derived from RFC7252 4.6. Message Size max payload */
#define COAP_DEBUG_BUF_SIZE (8 + 1024 * 2)
#endif /* defined(WITH_CONTIKI) || defined(WITH_LWIP) */
#endif /* COAP_DEBUG_BUF_SIZE */
#define COAP_DEFAULT_VERSION 1 /* version of CoAP supported */
#define COAP_DEFAULT_SCHEME "coap" /* the default scheme for CoAP URIs */
/** well-known resources URI */
#define COAP_DEFAULT_URI_WELLKNOWN ".well-known/core"
/* CoAP message types */
#define COAP_MESSAGE_CON 0 /* confirmable message (requires ACK/RST) */
#define COAP_MESSAGE_NON 1 /* non-confirmable message (one-shot message) */
#define COAP_MESSAGE_ACK 2 /* used to acknowledge confirmable messages */
#define COAP_MESSAGE_RST 3 /* indicates error in received messages */
/* CoAP request methods */
#define COAP_REQUEST_GET 1
#define COAP_REQUEST_POST 2
#define COAP_REQUEST_PUT 3
#define COAP_REQUEST_DELETE 4
#define COAP_REQUEST_FETCH 5 /* RFC 8132 */
#define COAP_REQUEST_PATCH 6 /* RFC 8132 */
#define COAP_REQUEST_IPATCH 7 /* RFC 8132 */
/*
* CoAP option types (be sure to update coap_option_check_critical() when
* adding options
*/
#define COAP_OPTION_IF_MATCH 1 /* C, opaque, 0-8 B, (none) */
#define COAP_OPTION_URI_HOST 3 /* C, String, 1-255 B, destination address */
#define COAP_OPTION_ETAG 4 /* E, opaque, 1-8 B, (none) */
#define COAP_OPTION_IF_NONE_MATCH 5 /* empty, 0 B, (none) */
#define COAP_OPTION_URI_PORT 7 /* C, uint, 0-2 B, destination port */
#define COAP_OPTION_LOCATION_PATH 8 /* E, String, 0-255 B, - */
#define COAP_OPTION_URI_PATH 11 /* C, String, 0-255 B, (none) */
#define COAP_OPTION_CONTENT_FORMAT 12 /* E, uint, 0-2 B, (none) */
#define COAP_OPTION_CONTENT_TYPE COAP_OPTION_CONTENT_FORMAT
#define COAP_OPTION_MAXAGE 14 /* E, uint, 0--4 B, 60 Seconds */
#define COAP_OPTION_URI_QUERY 15 /* C, String, 1-255 B, (none) */
#define COAP_OPTION_ACCEPT 17 /* C, uint, 0-2 B, (none) */
#define COAP_OPTION_LOCATION_QUERY 20 /* E, String, 0-255 B, (none) */
#define COAP_OPTION_SIZE2 28 /* E, uint, 0-4 B, (none) */
#define COAP_OPTION_PROXY_URI 35 /* C, String, 1-1034 B, (none) */
#define COAP_OPTION_PROXY_SCHEME 39 /* C, String, 1-255 B, (none) */
#define COAP_OPTION_SIZE1 60 /* E, uint, 0-4 B, (none) */
/* option types from RFC 7641 */
#define COAP_OPTION_OBSERVE 6 /* E, empty/uint, 0 B/0-3 B, (none) */
#define COAP_OPTION_SUBSCRIPTION COAP_OPTION_OBSERVE
/* selected option types from RFC 7959 */
#define COAP_OPTION_BLOCK2 23 /* C, uint, 0--3 B, (none) */
#define COAP_OPTION_BLOCK1 27 /* C, uint, 0--3 B, (none) */
/* selected option types from RFC 7967 */
#define COAP_OPTION_NORESPONSE 258 /* N, uint, 0--1 B, 0 */
#define COAP_MAX_OPT 65535 /**< the highest option number we know */
/* CoAP result codes (HTTP-Code / 100 * 40 + HTTP-Code % 100) */
/* As of draft-ietf-core-coap-04, response codes are encoded to base
* 32, i.e. the three upper bits determine the response class while
* the remaining five fine-grained information specific to that class.
*/
#define COAP_RESPONSE_CODE(N) (((N)/100 << 5) | (N)%100)
/* Determines the class of response code C */
#define COAP_RESPONSE_CLASS(C) (((C) >> 5) & 0xFF)
#ifndef SHORT_ERROR_RESPONSE
/**
* Returns a human-readable response phrase for the specified CoAP response @p
* code. This function returns @c NULL if not found.
*
* @param code The response code for which the literal phrase should be
* retrieved.
*
* @return A zero-terminated string describing the error, or @c NULL if not
* found.
*/
const char *coap_response_phrase(unsigned char code);
#define COAP_ERROR_PHRASE_LENGTH 32 /**< maximum length of error phrase */
#else
#define coap_response_phrase(x) ((char *)NULL)
#define COAP_ERROR_PHRASE_LENGTH 0 /**< maximum length of error phrase */
#endif /* SHORT_ERROR_RESPONSE */
/* The following definitions exist for backwards compatibility */
#if 0 /* this does not exist any more */
#define COAP_RESPONSE_100 40 /* 100 Continue */
#endif
#define COAP_RESPONSE_200 COAP_RESPONSE_CODE(200) /* 2.00 OK */
#define COAP_RESPONSE_201 COAP_RESPONSE_CODE(201) /* 2.01 Created */
#define COAP_RESPONSE_304 COAP_RESPONSE_CODE(203) /* 2.03 Valid */
#define COAP_RESPONSE_400 COAP_RESPONSE_CODE(400) /* 4.00 Bad Request */
#define COAP_RESPONSE_404 COAP_RESPONSE_CODE(404) /* 4.04 Not Found */
#define COAP_RESPONSE_405 COAP_RESPONSE_CODE(405) /* 4.05 Method Not Allowed */
#define COAP_RESPONSE_415 COAP_RESPONSE_CODE(415) /* 4.15 Unsupported Media Type */
#define COAP_RESPONSE_500 COAP_RESPONSE_CODE(500) /* 5.00 Internal Server Error */
#define COAP_RESPONSE_501 COAP_RESPONSE_CODE(501) /* 5.01 Not Implemented */
#define COAP_RESPONSE_503 COAP_RESPONSE_CODE(503) /* 5.03 Service Unavailable */
#define COAP_RESPONSE_504 COAP_RESPONSE_CODE(504) /* 5.04 Gateway Timeout */
#if 0 /* these response codes do not have a valid code any more */
# define COAP_RESPONSE_X_240 240 /* Token Option required by server */
# define COAP_RESPONSE_X_241 241 /* Uri-Authority Option required by server */
#endif
#define COAP_RESPONSE_X_242 COAP_RESPONSE_CODE(402) /* Critical Option not supported */
#define COAP_SIGNALING_CODE(N) (((N)/100 << 5) | (N)%100)
#define COAP_SIGNALING_CSM COAP_SIGNALING_CODE(701)
#define COAP_SIGNALING_PING COAP_SIGNALING_CODE(702)
#define COAP_SIGNALING_PONG COAP_SIGNALING_CODE(703)
#define COAP_SIGNALING_RELEASE COAP_SIGNALING_CODE(704)
#define COAP_SIGNALING_ABORT COAP_SIGNALING_CODE(705)
/* Applies to COAP_SIGNALING_CSM */
#define COAP_SIGNALING_OPTION_MAX_MESSAGE_SIZE 2
#define COAP_SIGNALING_OPTION_BLOCK_WISE_TRANSFER 4
/* Applies to COAP_SIGNALING_PING / COAP_SIGNALING_PONG */
#define COAP_SIGNALING_OPTION_CUSTODY 2
/* Applies to COAP_SIGNALING_RELEASE */
#define COAP_SIGNALING_OPTION_ALTERNATIVE_ADDRESS 2
#define COAP_SIGNALING_OPTION_HOLD_OFF 4
/* Applies to COAP_SIGNALING_ABORT */
#define COAP_SIGNALING_OPTION_BAD_CSM_OPTION 2
/* CoAP media type encoding */
#define COAP_MEDIATYPE_TEXT_PLAIN 0 /* text/plain (UTF-8) */
#define COAP_MEDIATYPE_APPLICATION_LINK_FORMAT 40 /* application/link-format */
#define COAP_MEDIATYPE_APPLICATION_XML 41 /* application/xml */
#define COAP_MEDIATYPE_APPLICATION_OCTET_STREAM 42 /* application/octet-stream */
#define COAP_MEDIATYPE_APPLICATION_RDF_XML 43 /* application/rdf+xml */
#define COAP_MEDIATYPE_APPLICATION_EXI 47 /* application/exi */
#define COAP_MEDIATYPE_APPLICATION_JSON 50 /* application/json */
#define COAP_MEDIATYPE_APPLICATION_CBOR 60 /* application/cbor */
/* Content formats from RFC 8152 */
#define COAP_MEDIATYPE_APPLICATION_COSE_SIGN 98 /* application/cose; cose-type="cose-sign" */
#define COAP_MEDIATYPE_APPLICATION_COSE_SIGN1 18 /* application/cose; cose-type="cose-sign1" */
#define COAP_MEDIATYPE_APPLICATION_COSE_ENCRYPT 96 /* application/cose; cose-type="cose-encrypt" */
#define COAP_MEDIATYPE_APPLICATION_COSE_ENCRYPT0 16 /* application/cose; cose-type="cose-encrypt0" */
#define COAP_MEDIATYPE_APPLICATION_COSE_MAC 97 /* application/cose; cose-type="cose-mac" */
#define COAP_MEDIATYPE_APPLICATION_COSE_MAC0 17 /* application/cose; cose-type="cose-mac0" */
#define COAP_MEDIATYPE_APPLICATION_COSE_KEY 101 /* application/cose-key */
#define COAP_MEDIATYPE_APPLICATION_COSE_KEY_SET 102 /* application/cose-key-set */
/* Content formats from RFC 8428 */
#define COAP_MEDIATYPE_APPLICATION_SENML_JSON 110 /* application/senml+json */
#define COAP_MEDIATYPE_APPLICATION_SENSML_JSON 111 /* application/sensml+json */
#define COAP_MEDIATYPE_APPLICATION_SENML_CBOR 112 /* application/senml+cbor */
#define COAP_MEDIATYPE_APPLICATION_SENSML_CBOR 113 /* application/sensml+cbor */
#define COAP_MEDIATYPE_APPLICATION_SENML_EXI 114 /* application/senml-exi */
#define COAP_MEDIATYPE_APPLICATION_SENSML_EXI 115 /* application/sensml-exi */
#define COAP_MEDIATYPE_APPLICATION_SENML_XML 310 /* application/senml+xml */
#define COAP_MEDIATYPE_APPLICATION_SENSML_XML 311 /* application/sensml+xml */
/* Note that identifiers for registered media types are in the range 0-65535. We
* use an unallocated type here and hope for the best. */
#define COAP_MEDIATYPE_ANY 0xff /* any media type */
/**
* coap_tid_t is used to store CoAP transaction id, i.e. a hash value
* built from the remote transport address and the message id of a
* CoAP PDU. Valid transaction ids are greater or equal zero.
*/
typedef int coap_tid_t;
/** Indicates an invalid transaction id. */
#define COAP_INVALID_TID -1
/**
* Indicates that a response is suppressed. This will occur for error
* responses if the request was received via IP multicast.
*/
#define COAP_DROPPED_RESPONSE -2
#define COAP_PDU_DELAYED -3
#define COAP_OPT_LONG 0x0F /* OC == 0b1111 indicates that the option list
* in a CoAP message is limited by 0b11110000
* marker */
#define COAP_OPT_END 0xF0 /* end marker */
#define COAP_PAYLOAD_START 0xFF /* payload marker */
/**
* @deprecated Use coap_optlist_t instead.
*
* Structures for more convenient handling of options. (To be used with ordered
* coap_list_t.) The option's data will be added to the end of the coap_option
* structure (see macro COAP_OPTION_DATA).
*/
COAP_DEPRECATED typedef struct {
uint16_t key; /* the option key (no delta coding) */
unsigned int length;
} coap_option;
#define COAP_OPTION_KEY(option) (option).key
#define COAP_OPTION_LENGTH(option) (option).length
#define COAP_OPTION_DATA(option) ((unsigned char *)&(option) + sizeof(coap_option))
/**
* structure for CoAP PDUs
* token, if any, follows the fixed size header, then options until
* payload marker (0xff), then the payload if stored inline.
* Memory layout is:
* <---header--->|<---token---><---options--->0xff<---payload--->
* header is addressed with a negative offset to token, its maximum size is
* max_hdr_size.
* options starts at token + token_length
* payload starts at data, its length is used_size - (data - token)
*/
typedef struct coap_pdu_t {
uint8_t type; /**< message type */
uint8_t code; /**< request method (value 1--10) or response code (value 40-255) */
uint8_t max_hdr_size; /**< space reserved for protocol-specific header */
uint8_t hdr_size; /**< actaul size used for protocol-specific header */
uint8_t token_length; /**< length of Token */
uint16_t tid; /**< transaction id, if any, in regular host byte order */
uint16_t max_delta; /**< highest option number */
size_t alloc_size; /**< allocated storage for token, options and payload */
size_t used_size; /**< used bytes of storage for token, options and payload */
size_t max_size; /**< maximum size for token, options and payload, or zero for variable size pdu */
uint8_t *token; /**< first byte of token, if any, or options */
uint8_t *data; /**< first byte of payload, if any */
#ifdef WITH_LWIP
struct pbuf *pbuf; /**< lwIP PBUF. The package data will always reside
* inside the pbuf's payload, but this pointer
* has to be kept because no exact offset can be
* given. This field must not be accessed from
* outside, because the pbuf's reference count
* is checked to be 1 when the pbuf is assigned
* to the pdu, and the pbuf stays exclusive to
* this pdu. */
#endif
} coap_pdu_t;
#define COAP_PDU_IS_EMPTY(pdu) ((pdu)->code == 0)
#define COAP_PDU_IS_REQUEST(pdu) (!COAP_PDU_IS_EMPTY(pdu) && (pdu)->code < 32)
#define COAP_PDU_IS_RESPONSE(pdu) ((pdu)->code >= 64 && (pdu)->code < 224)
#define COAP_PDU_IS_SIGNALING(pdu) ((pdu)->code >= 224)
#define COAP_PDU_MAX_UDP_HEADER_SIZE 4
#define COAP_PDU_MAX_TCP_HEADER_SIZE 6
#ifdef WITH_LWIP
/**
* Creates a CoAP PDU from an lwIP @p pbuf, whose reference is passed on to this
* function.
*
* The pbuf is checked for being contiguous, and for having only one reference.
* The reference is stored in the PDU and will be freed when the PDU is freed.
*
* (For now, these are fatal errors; in future, a new pbuf might be allocated,
* the data copied and the passed pbuf freed).
*
* This behaves like coap_pdu_init(0, 0, 0, pbuf->tot_len), and afterwards
* copying the contents of the pbuf to the pdu.
*
* @return A pointer to the new PDU object or @c NULL on error.
*/
coap_pdu_t * coap_pdu_from_pbuf(struct pbuf *pbuf);
#endif
typedef uint8_t coap_proto_t;
/**
* coap_proto_t values
*/
#define COAP_PROTO_NONE 0
#define COAP_PROTO_UDP 1
#define COAP_PROTO_DTLS 2
#define COAP_PROTO_TCP 3
#define COAP_PROTO_TLS 4
/**
* Creates a new CoAP PDU with at least enough storage space for the given
* @p size maximum message size. The function returns a pointer to the
* node coap_pdu_t object on success, or @c NULL on error. The storage allocated
* for the result must be released with coap_delete_pdu() if coap_send() is not
* called.
*
* @param type The type of the PDU (one of COAP_MESSAGE_CON, COAP_MESSAGE_NON,
* COAP_MESSAGE_ACK, COAP_MESSAGE_RST).
* @param code The message code.
* @param tid The transcation id to set or 0 if unknown / not applicable.
* @param size The maximum allowed number of byte for the message.
* @return A pointer to the new PDU object or @c NULL on error.
*/
coap_pdu_t *
coap_pdu_init(uint8_t type, uint8_t code, uint16_t tid, size_t size);
/**
* Dynamically grows the size of @p pdu to @p new_size. The new size
* must not exceed the PDU's configure maximum size. On success, this
* function returns 1, otherwise 0.
*
* @param pdu The PDU to resize.
* @param new_size The new size in bytes.
* @return 1 if the operation succeeded, 0 otherwise.
*/
int coap_pdu_resize(coap_pdu_t *pdu, size_t new_size);
/**
* Clears any contents from @p pdu and resets @c used_size,
* and @c data pointers. @c max_size is set to @p size, any
* other field is set to @c 0. Note that @p pdu must be a valid
* pointer to a coap_pdu_t object created e.g. by coap_pdu_init().
*/
void coap_pdu_clear(coap_pdu_t *pdu, size_t size);
/**
* Creates a new CoAP PDU.
*/
coap_pdu_t *coap_new_pdu(const struct coap_session_t *session);
/**
* Dispose of an CoAP PDU and frees associated storage.
* Not that in general you should not call this function directly.
* When a PDU is sent with coap_send(), coap_delete_pdu() will be
* called automatically for you.
*/
void coap_delete_pdu(coap_pdu_t *);
/**
* Interprets @p data to determine the number of bytes in the header.
* This function returns @c 0 on error or a number greater than zero on success.
*
* @param proto Session's protocol
* @param data The first byte of raw data to parse as CoAP PDU.
*
* @return A value greater than zero on success or @c 0 on error.
*/
size_t coap_pdu_parse_header_size(coap_proto_t proto,
const uint8_t *data);
/**
* Parses @p data to extract the message size.
* @p length must be at least coap_pdu_parse_header_size(proto, data).
* This function returns @c 0 on error or a number greater than zero on success.
*
* @param proto Session's protocol
* @param data The raw data to parse as CoAP PDU.
* @param length The actual size of @p data.
*
* @return A value greater than zero on success or @c 0 on error.
*/
size_t coap_pdu_parse_size(coap_proto_t proto,
const uint8_t *data,
size_t length);
/**
* Decode the protocol specific header for the specified PDU.
* @param pdu A newly received PDU.
* @param proto The target wire protocol.
* @return 1 for success or 0 on error.
*/
int coap_pdu_parse_header(coap_pdu_t *pdu, coap_proto_t proto);
/**
* Verify consistency in the given CoAP PDU structure and locate the data.
* This function returns @c 0 on error or a number greater than zero on
* success.
* This function only parses the token and options, up to the payload start
* marker.
*
* @param pdu The PDU structure to.
*
* @return 1 on success or @c 0 on error.
*/
int coap_pdu_parse_opt(coap_pdu_t *pdu);
/**
* Parses @p data into the CoAP PDU structure given in @p result.
* The target pdu must be large enough to
* This function returns @c 0 on error or a number greater than zero on success.
*
* @param proto Session's protocol
* @param data The raw data to parse as CoAP PDU.
* @param length The actual size of @p data.
* @param pdu The PDU structure to fill. Note that the structure must
* provide space to hold at least the token and options
* part of the message.
*
* @return 1 on success or @c 0 on error.
*/
int coap_pdu_parse(coap_proto_t proto,
const uint8_t *data,
size_t length,
coap_pdu_t *pdu);
/**
* Adds token of length @p len to @p pdu.
* Adding the token destroys any following contents of the pdu. Hence options
* and data must be added after coap_add_token() has been called. In @p pdu,
* length is set to @p len + @c 4, and max_delta is set to @c 0. This function
* returns @c 0 on error or a value greater than zero on success.
*
* @param pdu The PDU where the token is to be added.
* @param len The length of the new token.
* @param data The token to add.
*
* @return A value greater than zero on success, or @c 0 on error.
*/
int coap_add_token(coap_pdu_t *pdu,
size_t len,
const uint8_t *data);
/**
* Adds option of given type to pdu that is passed as first
* parameter.
* coap_add_option() destroys the PDU's data, so coap_add_data() must be called
* after all options have been added. As coap_add_token() destroys the options
* following the token, the token must be added before coap_add_option() is
* called. This function returns the number of bytes written or @c 0 on error.
*/
size_t coap_add_option(coap_pdu_t *pdu,
uint16_t type,
size_t len,
const uint8_t *data);
/**
* Adds option of given type to pdu that is passed as first parameter, but does
* not write a value. It works like coap_add_option with respect to calling
* sequence (i.e. after token and before data). This function returns a memory
* address to which the option data has to be written before the PDU can be
* sent, or @c NULL on error.
*/
uint8_t *coap_add_option_later(coap_pdu_t *pdu,
uint16_t type,
size_t len);
/**
* Adds given data to the pdu that is passed as first parameter. Note that the
* PDU's data is destroyed by coap_add_option(). coap_add_data() must be called
* only once per PDU, otherwise the result is undefined.
*/
int coap_add_data(coap_pdu_t *pdu,
size_t len,
const uint8_t *data);
/**
* Adds given data to the pdu that is passed as first parameter but does not
* copyt it. Note that the PDU's data is destroyed by coap_add_option().
* coap_add_data() must be have been called once for this PDU, otherwise the
* result is undefined.
* The actual data must be copied at the returned location.
*/
uint8_t *coap_add_data_after(coap_pdu_t *pdu, size_t len);
/**
* Retrieves the length and data pointer of specified PDU. Returns 0 on error or
* 1 if *len and *data have correct values. Note that these values are destroyed
* with the pdu.
*/
int coap_get_data(const coap_pdu_t *pdu,
size_t *len,
uint8_t **data);
/**
* Compose the protocol specific header for the specified PDU.
* @param pdu A newly composed PDU.
* @param proto The target wire protocol.
* @return Number of header bytes prepended before pdu->token or 0 on error.
*/
size_t coap_pdu_encode_header(coap_pdu_t *pdu, coap_proto_t proto);
#endif /* COAP_PDU_H_ */
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