The ECHO server simply echoes back to the user anything that
he sends. This is a useful tool for testing connections,
throughput etc.
The server is accessed by connecting to TCP port 7, or by
issuing the ECHO command at XRPi's normal command prompt.
An ECHO session can only be ended by disconnection.
The server is available by default, and requires no setting
up, other than the IP routing.
The server's TCP port may be changed, or the server disabled,
by using the ECHOPORT=n directive in XROUTER.CFG. See TCP-PORTS for details of how to change ports. Setting the
port to zero disables the server.