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Provides the TCP echo service on port 7.
To use SMTECHO, call smtecho init(). This initialises the echo service on TCP port 7. If you set the global variable ip_portbase to some value before initialising SMTECHO, the echo port is moved by that value. For instance, if you set ip_portbase to 8000, the echo port is 8007. This lets you run the service in 'user space': on most systems you need root access to use ports below 1000.
The hypertext view of SMTECHO's dialog and source code may help to understand how SMTECHO works.
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