TFTP

Zephyr provides a simple TFTP client library that can enabled with CONFIG_MQTT_SN_LIB Kconfig option.

See TFTP client sample application for more information about the library usage.

API Reference

Related code samples

TFTP client

Use the TFTP client library to get/put files from/to a TFTP server.

group tftp_client

TFTP client error codes.

TFTPC_SUCCESS

Success.

TFTPC_DUPLICATE_DATA

Duplicate data received.

TFTPC_BUFFER_OVERFLOW

User buffer is too small.

TFTPC_UNKNOWN_FAILURE

Unknown failure.

TFTPC_REMOTE_ERROR

Remote server error.

TFTPC_RETRIES_EXHAUSTED

Retries exhausted.

Defines

TFTP_BLOCK_SIZE

RFC1350: the file is sent in fixed length blocks of 512 bytes.

Each data packet contains one block of data, and must be acknowledged by an acknowledgment packet before the next packet can be sent. A data packet of less than 512 bytes signals termination of a transfer.

TFTP_HEADER_SIZE

RFC1350: For non-request TFTP message, the header contains 2-byte operation code plus 2-byte block number or error code.

TFTPC_MAX_BUF_SIZE

Maximum amount of data that can be sent or received.

Typedefs

typedef void (*tftp_callback_t)(const struct tftp_evt *evt)

TFTP event notification callback registered by the application.

Param evt:

[in] Event description along with result and associated parameters (if any).

Enums

enum tftp_evt_type

TFTP Asynchronous Events notified to the application from the module through the callback registered by the application.

Values:

enumerator TFTP_EVT_DATA

DATA event when data is received from remote server.

Note

DATA event structure contains payload data and size.

enumerator TFTP_EVT_ERROR

ERROR event when error is received from remote server.

Note

ERROR event structure contains error code and message.

Functions

int tftp_get(struct tftpc *client, const char *remote_file, const char *mode)

This function gets data from a “file” on the remote server.

Note

This function blocks until the transfer is completed or network error happens. The integrity of the client structure must be ensured until the function returns.

Parameters:

  • client – Client information of type tftpc.

  • remote_file – Name of the remote file to get.

  • mode – TFTP Client “mode” setting.

Return values:

  • The – size of data being received if the operation completed successfully.

  • TFTPC_BUFFER_OVERFLOW – if the file is larger than the user buffer.

  • TFTPC_REMOTE_ERROR – if the server failed to process our request.

  • TFTPC_RETRIES_EXHAUSTED – if the client timed out waiting for server.

  • -EINVAL – if client is NULL.

int tftp_put(struct tftpc *client, const char *remote_file, const char *mode, const uint8_t *user_buf, uint32_t user_buf_size)

This function puts data to a “file” on the remote server.

Note

This function blocks until the transfer is completed or network error happens. The integrity of the client structure must be ensured until the function returns.

Parameters:

  • client – Client information of type tftpc.

  • remote_file – Name of the remote file to put.

  • mode – TFTP Client “mode” setting.

  • user_buf – Data buffer containing the data to put.

  • user_buf_size – Length of the data to put.

Return values:

  • The – size of data being sent if the operation completed successfully.

  • TFTPC_REMOTE_ERROR – if the server failed to process our request.

  • TFTPC_RETRIES_EXHAUSTED – if the client timed out waiting for server.

  • -EINVAL – if client or user_buf is NULL or if user_buf_size is zero.

struct tftp_data_param
#include <tftp.h>

Parameters for data event.

Public Members

uint8_t *data_ptr

Pointer to binary data.

uint32_t len

Length of binary data.

struct tftp_error_param
#include <tftp.h>

Parameters for error event.

Public Members

char *msg

Error message.

int code

Error code.

union tftp_evt_param
#include <tftp.h>

Defines event parameters notified along with asynchronous events to the application.

Public Members

struct tftp_data_param data

Parameters accompanying TFTP_EVT_DATA event.

struct tftp_error_param error

Parameters accompanying TFTP_EVT_ERROR event.

struct tftp_evt
#include <tftp.h>

Defines TFTP asynchronous event notified to the application.

Public Members

enum tftp_evt_type type

Identifies the event.

union tftp_evt_param param

Contains parameters (if any) accompanying the event.

struct tftpc
#include <tftp.h>

TFTP client definition to maintain information relevant to the client.

Note

Application must initialize server and callback before calling GET or PUT API with the tftpc structure.

Public Members

struct sockaddr server

Socket address pointing to the remote TFTP server.

tftp_callback_t callback

Event notification callback.

No notification if NULL

uint8_t tftp_buf[(512 + 4)]

Buffer for internal usage.