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_SINGLE to 1 at the top of
the project's main.c source file to include the example in the
The example creates two RTOS tasks that send TCP echo requests to an external
using the standard echo port (port 7), then wait to receive the echo
reply within the same RTOS task. A
separate TCP echo example
uses the same TCP socket from two different RTOS tasks - one RTOS task sends
the echo request and another RTOS tasks receives the echo reply.
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.