lwm2m_ctx Struct Reference

LwM2M context structure to maintain information for a single LwM2M connection. More...

#include <lwm2m.h>

Data Fields
struct sockaddr	remote_addr
	Destination address storage.
void *	processed_req
	A pointer to currently processed request, for internal LwM2M engine use.
lwm2m_set_sockopt_cb_t	set_socketoptions
	Custom socket options.
bool	use_dtls
	Flag to indicate if context should use DTLS.
bool	connection_suspended
	Flag to indicate that the socket connection is suspended.
bool	buffer_client_messages
	Flag to indicate that the client is buffering Notifications and Send messages.
int	sec_obj_inst
	Current index of Security Object used for server credentials.
int	srv_obj_inst
	Current index of Server Object used in this context.
bool	bootstrap_mode
	Flag to enable BOOTSTRAP interface.
int	sock_fd
	Socket File Descriptor.
lwm2m_socket_fault_cb_t	fault_cb
	Socket fault callback.
lwm2m_observe_cb_t	observe_cb
	Callback for new or cancelled observations, and acknowledged or timed out notifications.
lwm2m_ctx_event_cb_t	event_cb
	Callback for client events.
uint8_t	validate_buf [CONFIG_LWM2M_ENGINE_VALIDATION_BUFFER_SIZE]
	Validation buffer.
void(*	set_socket_state )(int fd, enum lwm2m_socket_states state)
	Callback to indicate transmission states.
DTLS related information
Available only when CONFIG_LWM2M_DTLS_SUPPORT is enabled and lwm2m_ctx::use_dtls is set to true.
int	tls_tag
	TLS tag is set by client as a reference used when the LwM2M engine calls tls_credential_(add|delete)
char *	desthostname
	Destination hostname.
uint16_t	desthostnamelen
	Destination hostname length.
int(*	load_credentials )(struct lwm2m_ctx *client_ctx)
	Custom load_credentials function.

Detailed Description

LwM2M context structure to maintain information for a single LwM2M connection.

Field Documentation

bootstrap_mode

bool lwm2m_ctx::bootstrap_mode

Flag to enable BOOTSTRAP interface.

See Section "Bootstrap Interface" of LwM2M Technical Specification for more information.

buffer_client_messages

bool lwm2m_ctx::buffer_client_messages

Flag to indicate that the client is buffering Notifications and Send messages.

True value buffer Notifications and Send messages.

connection_suspended

bool lwm2m_ctx::connection_suspended

Flag to indicate that the socket connection is suspended.

With queue mode, this will tell if there is a need to reconnect.

desthostname

char* lwm2m_ctx::desthostname

Destination hostname.

When MBEDTLS SNI is enabled socket must be set with destination server hostname.

desthostnamelen

uint16_t lwm2m_ctx::desthostnamelen

Destination hostname length.

event_cb

lwm2m_ctx_event_cb_t lwm2m_ctx::event_cb

Callback for client events.

fault_cb

lwm2m_socket_fault_cb_t lwm2m_ctx::fault_cb

Socket fault callback.

LwM2M processing thread will call this callback in case of socket errors on receive.

load_credentials

int(* lwm2m_ctx::load_credentials) (struct lwm2m_ctx *client_ctx)

Custom load_credentials function.

Client can set load_credentials function as a way of overriding the default behavior of load_tls_credential() in lwm2m_engine.c

observe_cb

lwm2m_observe_cb_t lwm2m_ctx::observe_cb

Callback for new or cancelled observations, and acknowledged or timed out notifications.

processed_req

void* lwm2m_ctx::processed_req

A pointer to currently processed request, for internal LwM2M engine use.

The underlying type is struct lwm2m_message, but since it's declared in a private header and not exposed to the application, it's stored as a void pointer.

remote_addr

struct sockaddr lwm2m_ctx::remote_addr

Destination address storage.

sec_obj_inst

int lwm2m_ctx::sec_obj_inst

Current index of Security Object used for server credentials.

set_socket_state

void(* lwm2m_ctx::set_socket_state) (int fd, enum lwm2m_socket_states state)

Callback to indicate transmission states.

Client application may request LwM2M engine to indicate hints about transmission states and use that information to control various power saving modes.

set_socketoptions

lwm2m_set_sockopt_cb_t lwm2m_ctx::set_socketoptions

Custom socket options.

Client can override default socket options by providing a callback that is called after a socket is created and before connect.

sock_fd

int lwm2m_ctx::sock_fd

Socket File Descriptor.

srv_obj_inst

int lwm2m_ctx::srv_obj_inst

Current index of Server Object used in this context.

tls_tag

int lwm2m_ctx::tls_tag

TLS tag is set by client as a reference used when the LwM2M engine calls tls_credential_(add|delete)

use_dtls

bool lwm2m_ctx::use_dtls

Flag to indicate if context should use DTLS.

Enabled via the use of coaps:// protocol prefix in connection information. NOTE: requires CONFIG_LWM2M_DTLS_SUPPORT

validate_buf

uint8_t lwm2m_ctx::validate_buf[CONFIG_LWM2M_ENGINE_VALIDATION_BUFFER_SIZE]

Validation buffer.

Used as a temporary buffer to decode the resource value before validation. On successful validation, its content is copied into the actual resource buffer.

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The documentation for this struct was generated from the following file:

• zephyr/net/lwm2m.h