If you or BrowserUk, need, I can route my gprs device to some other IP address

No thanks....sounds like work. :-)

You seem to be isolating the problem, what you need to do now is simplify your example for testing/debugging. Always try to start with the simplest setup, get it working, then add complexity. In your case, just try testing 2 GPS devices, and simplify your thread code (or even remove it and just go with IO::Select), until you see disconnects. Try removing all those If statements, and just have super simple code, like: 

 if($lclient->connected){
           print "1\n";   
         } else{
         print "not connected\n"
   }

[download]
Then start building from there. You should be able to turn off your device, and see what happens. Play with simple code until it's working under your control.

I have a feeling that your GPS devices may not be acting like a regular computer would, and you may need to put some IO::Select code into your thread code, so you can use it's can_read, can_write, and has_exception methods to detect problems in the GPS device. You can setup IO::Select to run on just the single client in each thread, like this untested pseudocode: 

my $sel = new IO::Select(); 
$sel->add($lclient);              
if($lclient->connected){
          print "connected\n";   
          print "can read\n"  if  ($sel->can_read);
          print "can write\n"  if  ($sel->can_write);
          print "has exception\n"  if  ($sel->has_exception);
} else{
    print "not connected\n"
}

[download]
I'm not really a human, but I play one on earth Remember How Lucky You Are

In reply to Re^3: Non closing sockets - threads by zentara
in thread Non closing sockets - threads by igor1212

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.