A simple TFTP server built with the TFTPServer library¶

In this example a FAT formatted SD card is connected to the MBED board to provide a storage place for a TFTP server. This will allow us to upload files to or download files from the TFTP server (SD card) over an Ethernet connection as well as to use the files uploaded to the TFTP server in a program running on the MBED board.

Schematic¶

We can use for example the SD Formatter utility to format an SD card for the FAT file system .

NOTE: In the commands below substitute 192.168.1.185 with the actual IP address of your TFTP server. It's printed to the serial terminal of the connected PC during the server start up.

To upload or download files from a MS Windows PC we can use the TFTP client utility as follows:

• To upload for example the test.txt file to the TFTP server:
  
  • Open a command prompt in the folder the file is located in.
    
  • Type tftp 192.168.1.185 put test.txt /fs/test.txt and hit ENTER
• To download for example the test.txt file from the TFTP server:
  
  • Open a command prompt in the destination folder.
    
  • Type tftp 192.168.1.185 get /fs/test.txt test.txt and hit ENTER

A similar built-in TFTP client is available also on MAC and Linux operating systems.

References:¶

• The Trivial File Transfer Protocol (TFTP)
  
• RFC 1350 - The TFT Protocol
• LaOS (The Laser Open Source) project