Pub-Sub envelope publisher in CL

;;; -*- Mode:Lisp; Syntax:ANSI-Common-Lisp; -*-
;;; Pubsub envelope publisher in Common Lisp
;;; Note that the zhelpers package also provides send-text and send-more-text
;;; Kamil Shakirov <moc.liamg|08slimak#moc.liamg|08slimak>

(defpackage #:zguide.psenvpub
(:nicknames #:psenvpub)
(:use #:cl #:zhelpers)
(:export #:main))

(in-package :zguide.psenvpub)

(defun main ()
;; Prepare our context and publisher
(zmq:with-context (context 1)
(zmq:with-socket (publisher context zmq:pub)
(zmq:bind publisher "tcp://*:5563")

;; Write two messages, each with an envelope and content
(send-more-text publisher "A")
(send-text publisher "We don't want to see this")
(send-more-text publisher "B")
(send-text publisher "We would like to see this")
(sleep 1))))