Lisp Tlen [new] -

Lisp doesn't get in the way of that conversation. There's no async/await tax, no "must use a framework" pressure, no "serialize to JSON, then deserialize" boilerplate. It's just read-line and write-line .

(defun handle-client (stream) "Echo back whatever the client sends, but shout it in uppercase." (loop :for line = (read-line stream nil) :while line :do (write-line (string-upcase line) stream) (force-output stream))) lisp tlen

Let's build a toy Telnet server in Common Lisp. We'll call it tlen.lisp (see what I did there?). Lisp doesn't get in the way of that conversation

If "tlen" relates to string length:

(defun start-tlen-server (&optional (port 2323)) "Start a Telnet-like server on PORT." (let ((listener (usocket:socket-listen "0.0.0.0" port))) (format t "~&TLEN Server listening on port ~A~%" port) (loop (let ((client-stream (usocket:socket-stream (usocket:socket-accept listener)))) (format t "~&New connection from ~A~%" client-stream) ;; Handle one client, then close (simple for demo) (handler-case (handle-client client-stream) (error (e) (format t "Error: ~A~%" e))) (close client-stream))))) (defun handle-client (stream) "Echo back whatever the client