TFTP Server

The Trivial File Transfer Protocol (TFTP) is a very simple protocol used to transfer files. Using this protocol, you can send files to the System or read files from it. This protocol can be used, for example, for Firmware Upgrade.

The following TFTP Server options are configurable from the Net_Config.c configuration file:

• TFTP Server switch enables or disables the TFTP Server service in your application. It is enabled when this value is set to 1. It should be set to 0 when TFTP server is not used in your application.

  #define TFTP_ENABLE    1
  

• Number of TFTP Sessions specifies the number of available TFTP sessions. The default value is one, and this enables only one concurrent client connection. You should increase this number if multiple TFTP clients must connect to the TFTP server at the same time.

  #define TFTP_NUMSESS   1
  

• Port Number specifies the listening UDP port number. The default TFTP server listening port is 69.

  #define TFTP_PORTNUM   69
  

• Enable Firewall Support switch enables or disables the TFTP Server operation mode. It is enabled when this value is set to 1. If this value is set to 0, the TFTP server runs in RFC1350 compliant mode. If this value is set to 1, TFTP server runs in Firewall Support mode and uses the listening UDP port not only to receive requests, but also to send the answers to the clients. The default TFTP server mode is Firewall Support not enabled.

  #define TFTP_ENFWALL   0
  

• Inactive Session Timeout in seconds is an inactive session timeout. The TFTP session closes if the TFTP file transfer is interrupted for some reason and the timeout timer expires.

  #define TFTP_DEFTOUT   15
  

• Number of Retries specifies how many times the TFTP Server tries to retransmit the data before giving up.

  #define TFTP_MAXRETRY  4
  

Note

• You also need to add the TFTP_uif.c user interface module to your project and customize it. This file is in the \Keil\ARM\RL\TCPnet\User folder.
• When the TFTP server is not enabled, the ARM linker does not link the TFTP support modules to your application and thus reduces the code size and memory usage.