Event Handling

API for event delivery from lower-layer library functions. More...

Collaboration diagram for Event Handling:

Typedefs
typedef 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 function coap_set_event_handler().

Enumerations
enum	coap_event_t {   COAP_EVENT_DTLS_CLOSED = 0x0000 , COAP_EVENT_DTLS_CONNECTED = 0x01DE , COAP_EVENT_DTLS_RENEGOTIATE = 0x01DF , COAP_EVENT_DTLS_ERROR = 0x0200 ,   COAP_EVENT_TCP_CONNECTED = 0x1001 , COAP_EVENT_TCP_CLOSED = 0x1002 , COAP_EVENT_TCP_FAILED = 0x1003 , COAP_EVENT_SESSION_CONNECTED = 0x2001 ,   COAP_EVENT_SESSION_CLOSED = 0x2002 , COAP_EVENT_SESSION_FAILED = 0x2003 , COAP_EVENT_PARTIAL_BLOCK = 0x3001 , COAP_EVENT_XMIT_BLOCK_FAIL = 0x3002 ,   COAP_EVENT_SERVER_SESSION_NEW = 0x4001 , COAP_EVENT_SERVER_SESSION_DEL = 0x4002 , COAP_EVENT_BAD_PACKET = 0x5001 , COAP_EVENT_MSG_RETRANSMITTED = 0x5002 ,   COAP_EVENT_OSCORE_DECRYPTION_FAILURE = 0x6001 , COAP_EVENT_OSCORE_NOT_ENABLED , COAP_EVENT_OSCORE_NO_PROTECTED_PAYLOAD , COAP_EVENT_OSCORE_NO_SECURITY ,   COAP_EVENT_OSCORE_INTERNAL_ERROR , COAP_EVENT_OSCORE_DECODE_ERROR , COAP_EVENT_WS_PACKET_SIZE = 0x7001 , COAP_EVENT_WS_CONNECTED ,   COAP_EVENT_WS_CLOSED , COAP_EVENT_KEEPALIVE_FAILURE = 0x8001 }
	Scalar type to represent different events, e.g. More...

Functions
void	coap_register_event_handler (coap_context_t *context, coap_event_handler_t hnd)
	Registers the function hnd as callback for events from the given CoAP context context.

Detailed Description

API for event delivery from lower-layer library functions.

Typedef Documentation

coap_event_handler_t

typedef 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 function coap_set_event_handler().

Parameters

session	The current CoAP session.
event	The event type that has occurred.

Returns

0 No further action required by libcoap 1 Depending from where called, libcoap may take further action (reserved for future use)

Definition at line 146 of file coap_event.h.

Enumeration Type Documentation

coap_event_t

enum coap_event_t

Scalar type to represent different events, e.g.

DTLS events or retransmission timeouts.

Enumerator
COAP_EVENT_DTLS_CLOSED	Triggerred when (D)TLS session closed.
COAP_EVENT_DTLS_CONNECTED	Triggered when (D)TLS session connected.
COAP_EVENT_DTLS_RENEGOTIATE	Triggered when (D)TLS session renegotiated.
COAP_EVENT_DTLS_ERROR	Triggered when (D)TLS error occurs.
COAP_EVENT_TCP_CONNECTED	Triggered when TCP layer connects.
COAP_EVENT_TCP_CLOSED	Triggered when TCP layer is closed.
COAP_EVENT_TCP_FAILED	Triggered when TCP layer fails for some reason.
COAP_EVENT_SESSION_CONNECTED	Triggered when TCP layer completes exchange of CSM information.
COAP_EVENT_SESSION_CLOSED	Triggered when TCP layer closes following exchange of CSM information.
COAP_EVENT_SESSION_FAILED	Triggered when TCP layer fails following exchange of CSM information.
COAP_EVENT_PARTIAL_BLOCK	Triggered when not all of a large body has been received.
COAP_EVENT_XMIT_BLOCK_FAIL	Triggered when not all of a large body has been transmitted.
COAP_EVENT_SERVER_SESSION_NEW	Called in the CoAP IO loop if a new server-side session is created due to an incoming connection. Note that the session might not be a fully established connection yet, it might also refer to, e.g., a DTLS session in a handshake stage.
COAP_EVENT_SERVER_SESSION_DEL	Called in the CoAP IO loop if a server session is deleted (e.g., due to inactivity or because the maximum number of idle sessions was exceeded). The session will still contain valid data when the event handler is called.
COAP_EVENT_BAD_PACKET	Triggered when badly formatted packet received.
COAP_EVENT_MSG_RETRANSMITTED	Triggered when a message is retransmitted.
COAP_EVENT_OSCORE_DECRYPTION_FAILURE	Triggered when there is an OSCORE decryption failure.
COAP_EVENT_OSCORE_NOT_ENABLED	Triggered when trying to use OSCORE to decrypt, but it is not enabled.
COAP_EVENT_OSCORE_NO_PROTECTED_PAYLOAD	Triggered when there is no OSCORE encrypted payload provided.
COAP_EVENT_OSCORE_NO_SECURITY	Triggered when there is no OSCORE security definition found.
COAP_EVENT_OSCORE_INTERNAL_ERROR	Triggered when there is an OSCORE internal error i.e malloc failed.
COAP_EVENT_OSCORE_DECODE_ERROR	Triggered when there is an OSCORE decode of OSCORE option failure.
COAP_EVENT_WS_PACKET_SIZE	Triggered when there is an oversize WebSockets packet.
COAP_EVENT_WS_CONNECTED	Triggered when the WebSockets layer is up.
COAP_EVENT_WS_CLOSED	Triggered when the WebSockets layer is closed.
COAP_EVENT_KEEPALIVE_FAILURE	Triggered when no response to a keep alive (ping) packet.

Definition at line 34 of file coap_event.h.

Function Documentation

coap_register_event_handler()

void coap_register_event_handler	(	coap_context_t *	context,
		coap_event_handler_t	hnd
	)

Registers the function hnd as callback for events from the given CoAP context context.

Any event handler that has previously been registered with context will be overwritten by this operation.

Parameters

context	The CoAP context to register the event handler with.
hnd	The event handler to be registered. NULL if to be de-registered.

Definition at line 24 of file coap_event.c.