Asynchronous Messaging

API functions for Async "separate" messages. More...

Functions
int	coap_async_is_supported (void)
	Returns 1 if libcoap was built with separate messages enabled, 0 otherwise. More...
coap_async_t *	coap_register_async (coap_session_t *session, const coap_pdu_t *request, coap_tick_t delay)
	Allocates a new coap_async_t object and fills its fields according to the given request. More...
void	coap_async_set_delay (coap_async_t *async, coap_tick_t delay)
	Update the delay timeout, so changing when the registered async triggers. More...
void	coap_free_async (coap_session_t *session, coap_async_t *async)
	Releases the memory that was allocated by coap_register_async() for the object async. More...
coap_async_t *	coap_find_async (coap_session_t *session, coap_bin_const_t token)
	Retrieves the object identified by token from the list of asynchronous transactions that are registered with context. More...
void	coap_async_set_app_data (coap_async_t *async, void *app_data)
	Set the application data pointer held in async. More...
void *	coap_async_get_app_data (const coap_async_t *async)
	Gets the application data pointer held in async. More...

Detailed Description

API functions for Async "separate" messages.

A coap_context_t object holds a list of coap_async_t objects that can be used to generate a separate response in the case a result of a request cannot be delivered immediately.

Function Documentation

coap_async_get_app_data()

void* coap_async_get_app_data

(

const coap_async_t *

async

)

Gets the application data pointer held in async.

Parameters

async

The async state object.

Returns

The applicaton data pointer.

Definition at line 154 of file async.c.

coap_async_is_supported()

int coap_async_is_supported

(

void

)

Returns 1 if libcoap was built with separate messages enabled, 0 otherwise.

Definition at line 33 of file async.c.

coap_async_set_app_data()

void coap_async_set_app_data	(	coap_async_t *	async,
		void *	app_data
	)

Set the application data pointer held in async.

This overwrites any existing data pointer.

Parameters

async	The async state object.
app_data	The pointer to the data.

Definition at line 149 of file async.c.

coap_async_set_delay()

void coap_async_set_delay	(	coap_async_t *	async,
		coap_tick_t	delay
	)

Update the delay timeout, so changing when the registered async triggers.

When the new delay expires, a copy of the original request will get sent to the appropriate request handler.

Parameters

async	The object to update.
delay	The amount of time to delay before sending response, 0 means wait forever.

Definition at line 91 of file async.c.

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coap_find_async()

coap_async_t* coap_find_async	(	coap_session_t *	session,
		coap_bin_const_t	token
	)

Retrieves the object identified by token from the list of asynchronous transactions that are registered with context.

This function returns a pointer to that object or NULL if not found.

Parameters

session	The session that is used for asynchronous transmissions.
token	The PDU's token of the object to retrieve.

Returns

A pointer to the object identified by token or NULL if not found.

Definition at line 109 of file async.c.

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coap_free_async()

void coap_free_async	(	coap_session_t *	session,
		coap_async_t *	async
	)

Releases the memory that was allocated by coap_register_async() for the object async.

Parameters

session	The session to use.
async	The object to delete.

Definition at line 134 of file async.c.

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coap_register_async()

coap_async_t* coap_register_async	(	coap_session_t *	session,
		const coap_pdu_t *	request,
		coap_tick_t	delay
	)

Allocates a new coap_async_t object and fills its fields according to the given request.

This function returns a pointer to the registered coap_async_t object or NULL on error. Note that this function will return NULL in case that an object with the same identifier is already registered.

When the delay expires, a copy of the request will get sent to the appropriate request handler.

Parameters

session	The session that is used for asynchronous transmissions.
request	The request that is handled asynchronously.
delay	The amount of time to delay before sending response, 0 means wait forever.

Returns

A pointer to the registered coap_async_t object or NULL in case of an error.

Definition at line 38 of file async.c.

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