I want a Tkx application that shows the messages coming in via TCP ("real time", single-line messages). The Tkx part does not have any controls for the user (except "exit"), and there is only one client sending messages. I thought this would be easy but not so. The Cookbook does not have a working example, and my Tk book does not even start the subject. After a hint I made this (not working)
It seems to me that the fileevent in Tk is very different from Tkx

#!/opt/ActivePerl-5.12/bin/perl
use strict;
use warnings;

use Tkx;
Tkx::package_require('tile');
my $mw = Tkx::widget->new(".");

use IO::Socket;
my $server = IO::Socket::INET->new(
    LocalPort => 7777,
    Type      => SOCK_STREAM,
    Reuse     => 1,
    Listen    => 3
);

my $log = $mw->new_tk__text(
    -height => 10,
    -width  => 60,
    -wrap   => 'none'
);
$log->g_grid( -column => 0, -row => 0 );

Tkx::fconfigure($server, -blocking => 0);
Tkx::fileevent( $server, readable => [\&new_connection, \$server]  );
Tkx::MainLoop();

sub new_connection {
    my $listen = shift;
    my $client = $listen->accept() or warn "Can't accept connection";
    Tkx::fconfigure($client, -blocking => 0);
    Tkx::fileevent( $client, readable =>[\&handle_connection, \$client
+]  );
    $log->insert( 'end', "connected\n" );
    $log->see('end');
    Tkx::update();
}

sub handle_connection {
    my ($client) = shift;
    my $message = <$client>;
    if ( defined $message and $message !~ /^quit/ ) {
        $message =~ s/[\r\n]+$//;
        $log->insert( 'end', "$message\n" );
        $log->see('end');
        Tkx::update();
    }
    else {
        print "connection closed\n";
        $log->insert( 'end', "connection closed\n" );
        $log->see('end');
        Tkx::update();
        $client->close();
    }
}
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It generates an error: 
can not find channel named "IO::Socket::INET=GLOB(0xa119ed0)" at ./sps
+how_simple.pl line 24.
A client (not tested either because of failing server...)
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#!/usr/bin/perl
use IO::Socket;

my $machine_addr = 'localhost';
$sock = new IO::Socket::INET(PeerAddr=>$machine_addr,
      PeerPort=>7777,
      Proto=>'tcp',
      );
die "Could not connect: $!" unless $sock;
foreach my $count(1..100){
  print $sock "$count\n";
  print "$count\n";
}
close ($sock);
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