Not all demo projects will include this example. If this example is
included in a demo project then it may be necessary to set
mainCREATE_TCP_ECHO_TASKS_SEPARATE to 1 at the top of
the project's main.c source file to include the example in the
FreeRTOS+TCP is still in the lab
FreeRTOS+TCP is already used in
commercial products and we encourage
you to try it yourself.
Be aware however that we are
still refining its design, and the
source code and documentation do not
yet meet Real Time Engineers Ltd's strict quality standards.
Please use the forum for support,
feedback and ideas,
or contact us directly if you have a specific business interest.
The example creates two RTOS tasks that use the same TCP socket. One
RTOS task sends TCP echo requests to an external
using the standard echo port (port 7), the other RTOS task listens for
the echo replies. A separate example
uses the same RTOS task to both send echo requests and listen for echo
The IP address of the echo server must be configured using the
configECHO_SERVER_ADDR0 to configECHO_SERVER_ADDR3 constants in FreeRTOSConfig.h,
and the echo server must (stating the obvious) be enabled and not blocked by a
firewall. Windows ships with an echo server
but it is not enabled by default. Third party echo servers
are also available.