Lantronix ETS Reference Manual - page 117
TCP/IP Host Setup
Reverse Telnet (RTEL)
7-15
The command line parameters will be verified when the RTELPD daemon is started. The daemon process
will then wait for input to arrive on the pipe device. When input data is detected, a connection attempt will
be made to the target terminal server port, and if it is successful, data will start moving through the path.
If the specified service or port is currently busy, the daemon process will wait until the service or port is
available and then try again to connect. To the process dumping data into the pipe device, this waiting looks
like flow control. Eventually, the connection attempt should succeed, and the user data will flow through
the path. When the user process closes the pipe device, the RTELPD daemon will detect the end-of-file,
close the network connection, then restart the job cycle by waiting for input to arrive on the pipe.
It is important to remember that data will only move in one direction through a pipe. That is, data will flow
from the host to the printer, but not from the printer back to the host. Host application packages like
NewsPrint should be configured as if they were talking to parallel attached devices to ensure that the
software is not expecting a response from the printer.
To install the RTELPD daemon process and create a named pipe,
1
Create the named pipe and set up the server_hosts file using the mkpipe script. The process is shown
in Figure 7-17.
This example does not actually set up a print queue. It simply creates the named pipe and puts an entry
in the server_hosts file that says how to start up the RTELPD daemon process.