#!/usr/bin/perl

# http://perlmonks.org/?node_id=1183721

use strict;
use warnings;
use IO::Socket;
use IO::Select;
use Time::HiRes 'time';

@ARGV and $ARGV[0] eq 'tester' and do_test_routine();

my $from;
my $PORTNO = 7090;
my $timerinterval = 5;
my $timedresponse = "default timed response\n";
my $MAXLEN = 512;

my $sock = IO::Socket::INET->new(LocalPort => $PORTNO, Proto => 'udp')
  or die $@;
my $sel = IO::Select->new($sock);
my $nexttimer = time + $timerinterval;

for(;;)
  {
  my $timeout = $nexttimer - time;
  if( $timeout <= 0 )
    {
    warn "timed out @{[int time - $^T]}\n";
    if( defined $from ) #send time-triggered status
      {
      $sock->send($timedresponse, 0, $from);
      }
    $nexttimer = $timerinterval + time;
    }
  else
    {
    for my $fh ( $sel->can_read($timeout) )
      {
      $from = $fh->recv(my $request, $MAXLEN);
      my $response = parseRequest($request);
      $fh->send($response, 0, $from);
      }
    }
  }

sub parseRequest
  {
  warn "got @_";
  return "canned response\n";
  }

sub do_test_routine # for testing purposes only
  {
  my $sock = IO::Socket::INET->new(LocalPort => 7091, Proto => 'udp',
    PeerPort => 7090, PeerHost => 'localhost',
    ) or die $@;
  $sock->send("a test message\n");
  for(;;)
    {
    $sock->recv(my $buf, 512);
    warn "tester got: $buf";
    }
  }

[download]

semi-tested :)

In reply to Re: UDP Client and Server in one by tybalt89
in thread UDP Client and Server in one by mhirschb

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