Internal API for PDUs. More...

Collaboration diagram for PDU:

Data Structures
struct	coap_pdu_t
	structure for CoAP PDUs More...

Macros
#define	COAP_DEFAULT_VERSION 1 /* version of CoAP supported */

#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 */

#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)

#define	COAP_DROPPED_RESPONSE -2
	Indicates that a response is suppressed. More...

#define	COAP_PDU_DELAYED -3

#define	COAP_PAYLOAD_START 0xFF /* payload marker */

#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

Functions
int	coap_pdu_resize (coap_pdu_t *pdu, size_t new_size)
	Dynamically grows the size of `pdu` to `new_size`. More...

int	coap_pdu_check_resize (coap_pdu_t *pdu, size_t new_size)
	Dynamically grows the size of `pdu` to `new_size` if needed. More...

size_t	coap_pdu_parse_header_size (coap_proto_t proto, const uint8_t *data)
	Interprets `data` to determine the number of bytes in the header. More...

size_t	coap_pdu_parse_size (coap_proto_t proto, const uint8_t *data, size_t length)
	Parses `data` to extract the message size. More...

int	coap_pdu_parse_header (coap_pdu_t *pdu, coap_proto_t proto)
	Decode the protocol specific header for the specified PDU. More...

int	coap_pdu_parse_opt (coap_pdu_t *pdu)
	Verify consistency in the given CoAP PDU structure and locate the data. More...

void	coap_pdu_clear (coap_pdu_t *pdu, size_t size)
	Clears any contents from `pdu` and resets `used_size`, and `data` pointers. More...

size_t	coap_add_option_internal (coap_pdu_t pdu, coap_option_num_t number, size_t len, const uint8_t data)
	Adds option of given `number` to `pdu` that is passed as first parameter. More...

int	coap_remove_option (coap_pdu_t *pdu, coap_option_num_t number)
	Removes (first) option of given number from the `pdu`. More...

size_t	coap_insert_option (coap_pdu_t pdu, coap_option_num_t number, size_t len, const uint8_t data)
	Inserts option of given number in the `pdu` with the appropriate data. More...

size_t	coap_update_option (coap_pdu_t pdu, coap_option_num_t number, size_t len, const uint8_t data)
	Updates existing first option of given number in the `pdu` with the new data. More...

size_t	coap_pdu_encode_header (coap_pdu_t *pdu, coap_proto_t proto)
	Compose the protocol specific header for the specified PDU. More...

int	coap_update_token (coap_pdu_t pdu, size_t len, const uint8_t data)
	Updates token in `pdu` with length `len` and `data`. More...

Detailed Description

Internal API for PDUs.

Macro Definition Documentation

◆ COAP_DEFAULT_VERSION

#define COAP_DEFAULT_VERSION 1 /* version of CoAP supported */

Definition at line 35 of file coap_pdu_internal.h.

◆ COAP_DROPPED_RESPONSE

#define COAP_DROPPED_RESPONSE -2

Indicates that a response is suppressed.

This will occur for error responses if the request was received via IP multicast.

Definition at line 70 of file coap_pdu_internal.h.

◆ COAP_MAX_MESSAGE_SIZE_TCP0

#define COAP_MAX_MESSAGE_SIZE_TCP0 (COAP_MESSAGE_SIZE_OFFSET_TCP8-1) /* 12 */

Definition at line 43 of file coap_pdu_internal.h.

◆ COAP_MAX_MESSAGE_SIZE_TCP16

#define COAP_MAX_MESSAGE_SIZE_TCP16 (COAP_MESSAGE_SIZE_OFFSET_TCP32-1) /* 65804 */

Definition at line 45 of file coap_pdu_internal.h.

◆ COAP_MAX_MESSAGE_SIZE_TCP32

#define COAP_MAX_MESSAGE_SIZE_TCP32 (COAP_MESSAGE_SIZE_OFFSET_TCP32+0xFFFFFFFF)

Definition at line 46 of file coap_pdu_internal.h.

◆ COAP_MAX_MESSAGE_SIZE_TCP8

#define COAP_MAX_MESSAGE_SIZE_TCP8 (COAP_MESSAGE_SIZE_OFFSET_TCP16-1) /* 268 */

Definition at line 44 of file coap_pdu_internal.h.

◆ COAP_MESSAGE_SIZE_OFFSET_TCP16

#define COAP_MESSAGE_SIZE_OFFSET_TCP16 269 /* 13 + 256 */

Definition at line 39 of file coap_pdu_internal.h.

◆ COAP_MESSAGE_SIZE_OFFSET_TCP32

#define COAP_MESSAGE_SIZE_OFFSET_TCP32 65805 /* 269 + 65536 */

Definition at line 40 of file coap_pdu_internal.h.

◆ COAP_MESSAGE_SIZE_OFFSET_TCP8

#define COAP_MESSAGE_SIZE_OFFSET_TCP8 13

Definition at line 38 of file coap_pdu_internal.h.

◆ COAP_PAYLOAD_START

#define COAP_PAYLOAD_START 0xFF /* payload marker */

Definition at line 74 of file coap_pdu_internal.h.

◆ COAP_PDU_DELAYED

#define COAP_PDU_DELAYED -3

Definition at line 72 of file coap_pdu_internal.h.

◆ COAP_PDU_IS_EMPTY

#define COAP_PDU_IS_EMPTY ( pdu ) ((pdu)->code == 0)

Definition at line 76 of file coap_pdu_internal.h.

◆ COAP_PDU_IS_REQUEST

#define COAP_PDU_IS_REQUEST ( pdu ) (!COAP_PDU_IS_EMPTY(pdu) && (pdu)->code < 32)

Definition at line 77 of file coap_pdu_internal.h.

◆ COAP_PDU_IS_RESPONSE

#define COAP_PDU_IS_RESPONSE ( pdu ) ((pdu)->code >= 64 && (pdu)->code < 224)

Definition at line 78 of file coap_pdu_internal.h.

◆ COAP_PDU_IS_SIGNALING

#define COAP_PDU_IS_SIGNALING ( pdu ) ((pdu)->code >= 224)

Definition at line 79 of file coap_pdu_internal.h.

◆ COAP_PDU_MAX_TCP_HEADER_SIZE

#define COAP_PDU_MAX_TCP_HEADER_SIZE 6

Definition at line 82 of file coap_pdu_internal.h.

◆ COAP_PDU_MAX_UDP_HEADER_SIZE

#define COAP_PDU_MAX_UDP_HEADER_SIZE 4

Definition at line 81 of file coap_pdu_internal.h.

Function Documentation

◆ coap_add_option_internal()

size_t coap_add_option_internal	(	coap_pdu_t *	pdu,
		coap_option_num_t	number,
		size_t	len,
		const uint8_t *	data
	)

Adds option of given number to pdu that is passed as first parameter.

The internal version of coap_add_option() may cause an option to be inserted, even if there is any data in the pdu.

Note: Where possible, the option data needs to be stripped of leading zeros (big endian) to reduce the amount of data needed in the PDU, as well as in some cases the maximum data size of an option can be exceeded if not stripped and hence be illegal. This is done by using coap_encode_var_safe() or coap_encode_var_safe8().

Parameters

pdu	The PDU where the option is to be added.
number	The number of the new option.
len	The length of the new option.
data	The data of the new option.

Returns: The overall length of the option or 0 on failure.

Definition at line 615 of file pdu.c.

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◆ coap_insert_option()

size_t coap_insert_option	(	coap_pdu_t *	pdu,
		coap_option_num_t	number,
		size_t	len,
		const uint8_t *	data
	)

Inserts option of given number in the pdu with the appropriate data.

The option will be inserted in the appropriate place in the options in the pdu.

Parameters

pdu	The PDU where the option is to be inserted.
number	The number of the new option.
len	The length of the new option.
data	The data of the new option.

Returns: The overall length of the option or 0 on failure.

Definition at line 477 of file pdu.c.

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◆ coap_pdu_check_resize()

int coap_pdu_check_resize	(	coap_pdu_t *	pdu,
		size_t	new_size
	)

Dynamically grows the size of pdu to new_size if needed.

The new size must not exceed the PDU's configured maximum size. On success, this function returns 1, otherwise 0.

Parameters

pdu	The PDU to resize.
new_size	The new size in bytes.

Returns: 1 if the operation succeeded, 0 otherwise.

Definition at line 258 of file pdu.c.

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◆ coap_pdu_clear()

void coap_pdu_clear	(	coap_pdu_t *	pdu,
		size_t	size
	)

Clears any contents from pdu and resets used_size, and data pointers.

max_size is set to size, any other field is set to 0. Note that pdu must be a valid pointer to a coap_pdu_t object created e.g. by coap_pdu_init().

Parameters

pdu	The PDU to clear.
size	The maximum size of the PDU.

Definition at line 48 of file pdu.c.

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◆ coap_pdu_encode_header()

size_t coap_pdu_encode_header	(	coap_pdu_t *	pdu,
		coap_proto_t	proto
	)

Compose the protocol specific header for the specified PDU.

Parameters

pdu	A newly composed PDU.
proto	The target wire protocol.

Returns: Number of header bytes prepended before pdu->token or 0 on error.

Definition at line 1188 of file pdu.c.

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◆ coap_pdu_parse_header()

int coap_pdu_parse_header	(	coap_pdu_t *	pdu,
		coap_proto_t	proto
	)

Decode the protocol specific header for the specified PDU.

Parameters

pdu	A newly received PDU.
proto	The target wire protocol.

Returns: 1 for success or 0 on error.

Definition at line 884 of file pdu.c.

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◆ coap_pdu_parse_header_size()

size_t coap_pdu_parse_header_size	(	coap_proto_t	proto,
		const uint8_t *	data
	)

Interprets data to determine the number of bytes in the header.

This function returns 0 on error or a number greater than zero on success.

Parameters

proto	Session's protocol
data	The first byte of raw data to parse as CoAP PDU.

Returns: A value greater than zero on success or 0 on error.

Definition at line 829 of file pdu.c.

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◆ coap_pdu_parse_opt()

int coap_pdu_parse_opt ( coap_pdu_t * pdu )

Verify consistency in the given CoAP PDU structure and locate the data.

This function returns 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.

Parameters

pdu	The PDU structure to check.

Returns: 1 on success or 0 on error.

Definition at line 1038 of file pdu.c.

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◆ coap_pdu_parse_size()

size_t coap_pdu_parse_size	(	coap_proto_t	proto,
		const uint8_t *	data,
		size_t	length
	)

Parses data to extract the message size.

length must be at least coap_pdu_parse_header_size(proto, data). This function returns 0 on error or a number greater than zero on success.

Parameters

proto	Session's protocol
data	The raw data to parse as CoAP PDU.
length	The actual size of `data`.

Returns: A value greater than zero on success or 0 on error.

Definition at line 852 of file pdu.c.

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◆ coap_pdu_resize()

int coap_pdu_resize	(	coap_pdu_t *	pdu,
		size_t	new_size
	)

Dynamically grows the size of pdu to new_size.

The new size must not exceed the PDU's configure maximum size. On success, this function returns 1, otherwise 0.

Parameters

pdu	The PDU to resize.
new_size	The new size in bytes.

Returns: 1 if the operation succeeded, 0 otherwise.

Definition at line 223 of file pdu.c.

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◆ coap_remove_option()

int coap_remove_option	(	coap_pdu_t *	pdu,
		coap_option_num_t	number
	)

Removes (first) option of given number from the pdu.

Parameters

pdu	The PDU to remove the option from.
number	The number of the CoAP option to remove (first only removed).

Returns: 1 if success else 0 if error.

Definition at line 333 of file pdu.c.

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◆ coap_update_option()

size_t coap_update_option	(	coap_pdu_t *	pdu,
		coap_option_num_t	number,
		size_t	len,
		const uint8_t *	data
	)

Updates existing first option of given number in the pdu with the new data.

Parameters

pdu	The PDU where the option is to be updated.
number	The number of the option to update (first only updated).
len	The length of the updated option.
data	The data of the updated option.

Returns: The overall length of the updated option or 0 on failure.

Definition at line 565 of file pdu.c.

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◆ coap_update_token()

int coap_update_token	(	coap_pdu_t *	pdu,
		size_t	len,
		const uint8_t *	data
	)

Updates token in pdu with length len and data.

This function returns 0 on error or a value greater than zero on success.

Parameters

pdu	The PDU where the token is to be updated.
len	The length of the new token.
data	The token to add.

Returns: A value greater than zero on success, or 0 on error.

Definition at line 299 of file pdu.c.

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Data Structures

Macros

Functions

Detailed Description

Macro Definition Documentation

◆ COAP_DEFAULT_VERSION

◆ COAP_DROPPED_RESPONSE

◆ COAP_MAX_MESSAGE_SIZE_TCP0

◆ COAP_MAX_MESSAGE_SIZE_TCP16

◆ COAP_MAX_MESSAGE_SIZE_TCP32

◆ COAP_MAX_MESSAGE_SIZE_TCP8

◆ COAP_MESSAGE_SIZE_OFFSET_TCP16

◆ COAP_MESSAGE_SIZE_OFFSET_TCP32

◆ COAP_MESSAGE_SIZE_OFFSET_TCP8

◆ COAP_PAYLOAD_START

◆ COAP_PDU_DELAYED

◆ COAP_PDU_IS_EMPTY

◆ COAP_PDU_IS_REQUEST

◆ COAP_PDU_IS_RESPONSE

◆ COAP_PDU_IS_SIGNALING

◆ COAP_PDU_MAX_TCP_HEADER_SIZE

◆ COAP_PDU_MAX_UDP_HEADER_SIZE

Function Documentation

◆ coap_add_option_internal()

◆ coap_insert_option()

◆ coap_pdu_check_resize()

◆ coap_pdu_clear()

◆ coap_pdu_encode_header()

◆ coap_pdu_parse_header()

◆ coap_pdu_parse_header_size()

◆ coap_pdu_parse_opt()

◆ coap_pdu_parse_size()

◆ coap_pdu_resize()

◆ coap_remove_option()

◆ coap_update_option()

◆ coap_update_token()