SMP transport

MCUmgr SMP transport API. More...

Data Structures
struct	smp_transport_api_t
	Function pointers of SMP transport functions, if a handler is NULL then it is not supported/implemented. More...
struct	smp_transport
	SMP transport object for sending SMP responses. More...
struct	smp_client_transport_entry
	SMP Client transport structure. More...

Typedefs
typedef int(*	smp_transport_out_fn) (struct net_buf *nb)
	SMP transmit callback for transport.
typedef uint16_t(*	smp_transport_get_mtu_fn) (const struct net_buf *nb)
	SMP MTU query callback for transport.
typedef int(*	smp_transport_ud_copy_fn) (struct net_buf *dst, const struct net_buf *src)
	SMP copy user_data callback.
typedef void(*	smp_transport_ud_free_fn) (void *ud)
	SMP free user_data callback.
typedef bool(*	smp_transport_query_valid_check_fn) (struct net_buf *nb, void *arg)
	Function for checking if queued data is still valid.

Enumerations
enum	smp_transport_type {   SMP_SERIAL_TRANSPORT = 0 , SMP_BLUETOOTH_TRANSPORT , SMP_SHELL_TRANSPORT , SMP_UDP_IPV4_TRANSPORT ,   SMP_UDP_IPV6_TRANSPORT , SMP_LORAWAN_TRANSPORT , SMP_USER_DEFINED_TRANSPORT }
	SMP transport type for client registration. More...

Functions
int	smp_transport_init (struct smp_transport *smpt)
	Initializes a Zephyr SMP transport object.
void	smp_rx_remove_invalid (struct smp_transport *zst, void *arg)
	Used to remove queued requests for an SMP transport that are no longer valid.
void	smp_rx_clear (struct smp_transport *zst)
	Used to clear pending queued requests for an SMP transport.
void	smp_client_transport_register (struct smp_client_transport_entry *entry)
	Register a Zephyr SMP transport object for client.
struct smp_transport *	smp_client_transport_get (int smpt_type)
	Discover a registered SMP transport client object.

Detailed Description

MCUmgr SMP transport API.

Typedef Documentation

smp_transport_get_mtu_fn

typedef uint16_t(* smp_transport_get_mtu_fn) (const struct net_buf *nb)

#include <zephyr/mgmt/mcumgr/transport/smp.h>

SMP MTU query callback for transport.

The supplied net_buf should contain a request received from the peer whose MTU is being queried. This function takes a net_buf parameter because some transports store connection-specific information in the net_buf user header (e.g., the Bluetooth transport stores the peer address).

Parameters

nb	Contains a request from the relevant peer.

Returns

The transport's MTU; 0 if transmission is currently not possible.

smp_transport_out_fn

typedef int(* smp_transport_out_fn) (struct net_buf *nb)

#include <zephyr/mgmt/mcumgr/transport/smp.h>

SMP transmit callback for transport.

The supplied net_buf is always consumed, regardless of return code.

Parameters

nb	The net_buf to transmit.

Returns

0 on success, mcumgr_err_t code on failure.

smp_transport_query_valid_check_fn

typedef bool(* smp_transport_query_valid_check_fn) (struct net_buf *nb, void *arg)

#include <zephyr/mgmt/mcumgr/transport/smp.h>

Function for checking if queued data is still valid.

This function is used to check if queued SMP data is still valid e.g. on a remote device disconnecting, this is triggered when smp_rx_remove_invalid() is called.

Parameters

nb	net buf containing queued request.
arg	Argument provided when calling smp_rx_remove_invalid() function.

Returns

false if data is no longer valid/should be freed, true otherwise.

smp_transport_ud_copy_fn

typedef int(* smp_transport_ud_copy_fn) (struct net_buf *dst, const struct net_buf *src)

#include <zephyr/mgmt/mcumgr/transport/smp.h>

SMP copy user_data callback.

The supplied src net_buf should contain a user_data that cannot be copied using regular memcpy function (e.g., the Bluetooth transport net_buf user_data stores the connection reference that has to be incremented when is going to be used by another buffer).

Parameters

dst	Source buffer user_data pointer.
src	Destination buffer user_data pointer.

Returns

0 on success, mcumgr_err_t code on failure.

smp_transport_ud_free_fn

typedef void(* smp_transport_ud_free_fn) (void *ud)

#include <zephyr/mgmt/mcumgr/transport/smp.h>

SMP free user_data callback.

This function frees net_buf user data, because some transports store connection-specific information in the net_buf user data (e.g., the Bluetooth transport stores the connection reference that has to be decreased).

Parameters

ud	Contains a user_data pointer to be freed.

Enumeration Type Documentation

smp_transport_type

enum smp_transport_type

#include <zephyr/mgmt/mcumgr/transport/smp.h>

SMP transport type for client registration.

Enumerator
SMP_SERIAL_TRANSPORT	SMP serial.
SMP_BLUETOOTH_TRANSPORT	SMP bluetooth.
SMP_SHELL_TRANSPORT	SMP shell.
SMP_UDP_IPV4_TRANSPORT	SMP UDP IPv4.
SMP_UDP_IPV6_TRANSPORT	SMP UDP IPv6.
SMP_LORAWAN_TRANSPORT	SMP LoRaWAN.
SMP_USER_DEFINED_TRANSPORT	SMP user defined type.

Function Documentation

smp_client_transport_get()

struct smp_transport * smp_client_transport_get

(

int

smpt_type

)

#include <zephyr/mgmt/mcumgr/transport/smp.h>

Discover a registered SMP transport client object.

Parameters

smpt_type

Type of transport

Returns

Pointer to registered object. Unknown type return NULL.

smp_client_transport_register()

void smp_client_transport_register

(

struct smp_client_transport_entry *

entry

)

#include <zephyr/mgmt/mcumgr/transport/smp.h>

Register a Zephyr SMP transport object for client.

Parameters

entry

The transport to construct.

smp_rx_clear()

void smp_rx_clear

(

struct smp_transport *

zst

)

#include <zephyr/mgmt/mcumgr/transport/smp.h>

Used to clear pending queued requests for an SMP transport.

Parameters

zst	The transport to use.

smp_rx_remove_invalid()

void smp_rx_remove_invalid	(	struct smp_transport *	zst,
		void *	arg )

#include <zephyr/mgmt/mcumgr/transport/smp.h>

Used to remove queued requests for an SMP transport that are no longer valid.

A smp_transport_query_valid_check_fn() function must be registered for this to function. If the smp_transport_query_valid_check_fn() function returns false during a callback, the queried command will classed as invalid and dropped.

Parameters

zst	The transport to use.
arg	Argument provided to callback smp_transport_query_valid_check_fn() function.

smp_transport_init()

int smp_transport_init

(

struct smp_transport *

smpt

)

#include <zephyr/mgmt/mcumgr/transport/smp.h>

Initializes a Zephyr SMP transport object.

Parameters

smpt	The transport to construct.

Returns

0 If successful

Negative errno code if failure.