Keil Logo

Technical Support

On-Line Manuals

RL-ARM User's Guide (MDK v4)

RL-RTX RL-FlashFS RL-TCPnet TCP Socket Opening TCP Connection TCP Active Open TCP Passive Open Sending TCP Data Example for Sending Data Multiple TCP Connections UDP Socket Opening UDP Connection Sending UDP Data When DHCP Enabled When ARP Cache Empty Example for Sending Data IP Multicasting Multiple UDP Connections Configuring RL-TCPnet Static Configuration System Definitions Ethernet Network Interface PPP Network Interface SLIP Network Interface UDP Socket TCP Socket BSD Socket HTTP Server Telnet Server TFTP Server TFTP Client FTP Server FTP Client DNS Client SMTP Client SNMP Agent SNTP Client Error Function Runtime Configuration Library Files Using RL-TCPnet Stand Alone With RTX Kernel Event Driven Operation IP Address Assignment Ethernet Interface PPP Interface SLIP Interface Localhost Applications HTTP Server Script Language CGI Functions Ajax Support Using XML XML Example How it works SOAP Support SOAP Interface Large POST Messages Web Pages Default Page Error Pages Web on SD Card Web Update File System Interface Http Caching How it works Internal Web External Web Multi-user Authentication Using RAM File System FCARM File Converter PRINT Directive NOPRINT Directive PAGEWIDTH Directive PAGELENGTH Directive ROOT Directive Telnet Server Command Line Interface Multi-user Authentication Sending Reply Message Short Reply Long Reply Continuous Screen Update TFTP Server File System Interface TFTP Client File System Interface FTP Server File System Interface Multi-user Authentication Supported Commands FTP Client File System Interface SMTP Client SNMP Agent MIB Database MIB Interface MIB Entry MIB Table DNS Resolver Starting DNS Device Drivers Ethernet Driver Interrupt Mode Modem Driver Serial Driver Using Serial Link Cable Connection Modem Connection Windows Dial-up Add Direct Serial Link New Dial-up Connection Configure PPP Dial-up Configure SLIP Dial-up Debugging Enabling Debug Debug Level Redirecting Output Function Overview BSD Routines CGI Routines Ethernet Routines FTP Routines HTTP Routines IGMP Routines Miscellaneous Routines Modem Routines PPP Routines Serial Routines SLIP Routines SMTP Routines SNMP Routines System Functions TCP Routines Telnet Routines TFTP Routines UDP Routines RL-CAN RL-USB Example Programs Library Reference Appendix

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


  • 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.
  Arm logo
Important information

This site uses cookies to store information on your computer. By continuing to use our site, you consent to our cookies.

Change Settings

Privacy Policy Update

Arm’s Privacy Policy has been updated. By continuing to use our site, you consent to Arm’s Privacy Policy. Please review our Privacy Policy to learn more about our collection, use and transfers
of your data.