API functions for handling PDUs using CoAP BLOCK options. More...

Data Structures
struct	coap_block_t
	Structure of Block options. More...

Macros
#define	COAP_MAX_BLOCK_SZX 6
	The largest value for the SZX component in a Block option. More...

#define	COAP_OPT_BLOCK_LAST(opt) (coap_opt_length(opt) ? (coap_opt_value(opt) + (coap_opt_length(opt)-1)) : 0)
	Returns the value of the least significant byte of a Block option `opt`. More...

#define	COAP_OPT_BLOCK_MORE(opt) (coap_opt_length(opt) ? (*COAP_OPT_BLOCK_LAST(opt) & 0x08) : 0)
	Returns the value of the More-bit of a Block option `opt`. More...

#define	COAP_OPT_BLOCK_SZX(opt) (coap_opt_length(opt) ? (*COAP_OPT_BLOCK_LAST(opt) & 0x07) : 0)
	Returns the value of the SZX-field of a Block option `opt`. More...

Functions
unsigned int	coap_opt_block_num (const coap_opt_t *block_opt)
	Returns the value of field `num` in the given block option `block_opt`. More...

COAP_STATIC_INLINE int	coap_more_blocks (size_t data_len, unsigned int num, uint16_t szx)
	Checks if more than `num` blocks are required to deliver `data_len` bytes of data for a block size of 1 << (`szx` + 4). More...

int	coap_get_block (coap_pdu_t pdu, uint16_t type, coap_block_t block)
	Initializes `block` from `pdu`. More...

int	coap_write_block_opt (coap_block_t block, uint16_t type, coap_pdu_t pdu, size_t data_length)
	Writes a block option of type `type` to message `pdu`. More...

int	coap_add_block (coap_pdu_t pdu, unsigned int len, const uint8_t data, unsigned int block_num, unsigned char block_szx)
	Adds the `block_num` block of size 1 << (`block_szx` + 4) from source `data` to `pdu`. More...

void	coap_add_data_blocked_response (struct coap_resource_t resource, struct coap_session_t session, coap_pdu_t request, coap_pdu_t response, const coap_binary_t token, uint16_t media_type, int maxage, size_t length, const uint8_t data)
	Adds the appropriate part of `data` to the `response` pdu. More...

Detailed Description

API functions for handling PDUs using CoAP BLOCK options.

Macro Definition Documentation

◆ COAP_MAX_BLOCK_SZX

#define COAP_MAX_BLOCK_SZX 6

The largest value for the SZX component in a Block option.

Definition at line 30 of file block.h.

◆ COAP_OPT_BLOCK_LAST

#define COAP_OPT_BLOCK_LAST ( opt ) (coap_opt_length(opt) ? (coap_opt_value(opt) + (coap_opt_length(opt)-1)) : 0)

Returns the value of the least significant byte of a Block option opt.

For zero-length options (i.e. num == m == szx == 0), COAP_OPT_BLOCK_LAST returns NULL.

Definition at line 47 of file block.h.

◆ COAP_OPT_BLOCK_MORE

#define COAP_OPT_BLOCK_MORE ( opt ) (coap_opt_length(opt) ? (*COAP_OPT_BLOCK_LAST(opt) & 0x08) : 0)

Returns the value of the More-bit of a Block option opt.

Definition at line 51 of file block.h.

◆ COAP_OPT_BLOCK_SZX

#define COAP_OPT_BLOCK_SZX ( opt ) (coap_opt_length(opt) ? (*COAP_OPT_BLOCK_LAST(opt) & 0x07) : 0)

Returns the value of the SZX-field of a Block option opt.

Definition at line 55 of file block.h.

Function Documentation

◆ coap_add_block()

int coap_add_block	(	coap_pdu_t *	pdu,
		unsigned int	len,
		const uint8_t *	data,
		unsigned int	block_num,
		unsigned char	block_szx
	)

Adds the block_num block of size 1 << (block_szx + 4) from source data to pdu.

Parameters

pdu	The message to add the block.
len	The length of `data`.
data	The source data to fill the block with.
block_num	The actual block number.
block_szx	Encoded size of block `block_number`.

Returns: 1 on success, 0 otherwise.

Definition at line 125 of file block.c.

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◆ coap_add_data_blocked_response()

void coap_add_data_blocked_response	(	struct coap_resource_t *	resource,
		struct coap_session_t *	session,
		coap_pdu_t *	request,
		coap_pdu_t *	response,
		const coap_binary_t *	token,
		uint16_t	media_type,
		int	maxage,
		size_t	length,
		const uint8_t *	data
	)

Adds the appropriate part of data to the response pdu.

If blocks are required, then the appropriate block will be added to the PDU and sent. Adds a ETAG option that is the hash of the entire data if the data is to be split into blocks Used by a GET request handler.

Parameters

resource	The resource the data is associated with.
session	The coap session.
request	The requesting pdu.
response	The response pdu.
token	The token taken from the (original) requesting pdu.
media_type	The format of the data.
maxage	The maxmimum life of the data. If `-1`, then there is no maxage.
length	The total length of the data.
data	The entire data block to transmit.

Definition at line 142 of file block.c.

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◆ coap_get_block()

int coap_get_block	(	coap_pdu_t *	pdu,
		uint16_t	type,
		coap_block_t *	block
	)

Initializes block from pdu.

type must be either COAP_OPTION_BLOCK1 or COAP_OPTION_BLOCK2. When option type was found in pdu, block is initialized with values from this option and the function returns the value 1. Otherwise, 0 is returned.

Parameters

pdu	The pdu to search for option `type`.
type	The option to search for (must be COAP_OPTION_BLOCK1 or COAP_OPTION_BLOCK2).
block	The block structure to initilize.

Returns: 1 on success, 0 otherwise.

Definition at line 36 of file block.c.

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◆ coap_more_blocks()

COAP_STATIC_INLINE int coap_more_blocks	(	size_t	data_len,
		unsigned int	num,
		uint16_t	szx
	)

Checks if more than num blocks are required to deliver data_len bytes of data for a block size of 1 << (szx + 4).

Definition at line 68 of file block.h.

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◆ coap_opt_block_num()

unsigned int coap_opt_block_num ( const coap_opt_t * block_opt )

Returns the value of field num in the given block option block_opt.

Definition at line 17 of file block.c.

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◆ coap_write_block_opt()

int coap_write_block_opt	(	coap_block_t *	block,
		uint16_t	type,
		coap_pdu_t *	pdu,
		size_t	data_length
	)

Writes a block option of type type to message pdu.

If the requested block size is too large to fit in pdu, it is reduced accordingly. An exception is made for the final block when less space is required. The actual length of the resource is specified in data_length.

This function may change *block to reflect the values written to pdu. As the function takes into consideration the remaining space pdu, no more options should be added after coap_write_block_opt() has returned.

Parameters

block	The block structure to use. On return, this object is updated according to the values that have been written to `pdu`.
type	COAP_OPTION_BLOCK1 or COAP_OPTION_BLOCK2.
pdu	The message where the block option should be written.
data_length	The length of the actual data that will be added the `pdu` by calling coap_add_block().

Returns: 1 on success, or a negative value on error.

Definition at line 64 of file block.c.

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Data Structures

Macros

Functions

Detailed Description

Macro Definition Documentation

◆ COAP_MAX_BLOCK_SZX

◆ COAP_OPT_BLOCK_LAST

◆ COAP_OPT_BLOCK_MORE

◆ COAP_OPT_BLOCK_SZX

Function Documentation

◆ coap_add_block()

◆ coap_add_data_blocked_response()

◆ coap_get_block()

◆ coap_more_blocks()

◆ coap_opt_block_num()

◆ coap_write_block_opt()