Trying to use a socket to monitor an Ethernet port

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);
[download]

Comment on Trying to use a socket to monitor an Ethernet port Download Code

Replies are listed 'Best First'.
Re: Trying to use a socket to monitor an Ethernet port by ikegami (Patriarch) 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>;` [download] 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.	[reply] [d/l] [select]

Replies are listed 'Best First'.

Re: Trying to use a socket to monitor an Ethernet port
by ikegami (Patriarch) 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>;
[download]

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.

[reply]
[d/l]
[select]