Trying to use a socket to monitor an Ethernet port


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Trying to use a socket to monitor an Ethernet port

by hohumbgdl2003 (Initiate)

on Aug 03, 2006 at 00:09 UTC ( #565354=perlquestion: print w/ replies, xml )

Need Help??

hohumbgdl2003 has asked for the wisdom of the Perl Monks concerning the following question:

Hi, I'm a first time perl user looking for some help. I'm trying to communicate from my PC to a PLC on an ethernet card. I run my script to open a socket (the PLC is constantly talking) and it sits there doing nothing. I'm running a program that monitors the Ethernet port to see if it is talking and there is nothing. I can do this using HyperTerminal and it works fine and I see the communication between the two. I'm sure there is something simple missing. :O(

use IO::Socket;
  
  $sock = new IO::Socket::INET (
                                   PeerAddr => '141.121.85.63',
                                   PeerPort => '64511',
                                   Proto => 'tcp',
                                  Listen => SOMAXCONN,
                                   Reuse => 1,
                                  );
  die "Could not create socket: $!\n" unless $sock;

print $sock

 $new_sock = $sock->accept();
 while(<$new_sock>) {
    print "!99200test@@";
 }
 close($sock);
    
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Comment on Trying to use a socket to monitor an Ethernet port
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Re: Trying to use a socket to monitor an Ethernet port
by ikegami (Pope) on Aug 03, 2006 at 00:25 UTC

The problem is that you're specifying a PeerAddr (client socket) and Listen (server socket). Drop Listen and accept.

use IO::Socket::INET ();

my $sock = IO::Socket::INET->new(
   Proto    => 'tcp',
   PeerAddr => '141.121.85.63',
   PeerPort => '64511',
)
   or die "Unable to create socket: $!\n";

print while <$sock>;
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By the way, when on PerlMonks, please put your code, messages, etc inside of <c>...</c> tags. Please edit your post to spare a janitor the task.

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