sub send_singlecast {
  my ($NetDeviceID, $Send) = @_;
  my $Response;

  # Check if already connected
  if (! defined $NetDevice[$NetDeviceID]{"Socket"}) { 
    if ($Debug eq "YES") { print "Try to reconnect to Server $NetDevice[$NetDeviceID]{'Name'} ($NetDevice[$NetDeviceID]{'IP'})..."} 
    $NetDevice[$NetDeviceID]{"Socket"} = new IO::Socket::INET (
      Broadcast => 0,
      PeerHost  => $NetDevice[$NetDeviceID]{"IP"},
      PeerPort  => '5000',
      Proto     => 'tcp',
      Timeout   => 2,
    );
    if (defined $NetDevice[$NetDeviceID]{"Socket"}) { 
      if ($Debug eq "YES") { print "success.\n"; }
      $NetDevice[$NetDeviceID]{"Socket"}->autoflush(1);

      if ($Debug eq "YES") { print "Enable timeouts.\n"; }
      IO::Socket::Timeout->enable_timeouts_on($NetDevice[$NetDeviceID]{"Socket"});
      $NetDevice[$NetDeviceID]{"Socket"}->read_timeout(2);
      $NetDevice[$NetDeviceID]{"Socket"}->write_timeout(2);
    }
  }


  if (defined $NetDevice[$NetDeviceID]{"Socket"}) {
    # Asking for status or sending command
    $NetDevice[$NetDeviceID]{"Socket"}->send($Send);
    if ($Debug eq "YES") { print "Command '$Send' send to $NetDevice[$NetDeviceID]{'Name'}, waiting for response..."; }
    # Read the socket data sent by server
 
    $Response=<$NetDevice[$NetDeviceID]{"Socket"}>;

    if (! $Response && ( 0+$! == ETIMEDOUT || 0+$! == EWOULDBLOCK )) {
      if ($Debug eq "YES") { print "Timeout by reading from socket!\n"; }
      write_errorlog("ERROR by reading from Socket : $NetDevice[$NetDeviceID]{'Name'} -> Timeout");
      return("ERROR by reading from Socket : $NetDevice[$NetDeviceID]{'Name'} -> Timeout");
    } else {
      if ($Debug eq "YES") { print "received from Server : $Response\n"; }
      return($Response);
    }
  } else { 
    if ($Debug eq "YES") { print "ERROR in Socket Creation : $!\n"; }
    # Write ErrorLog
    write_errorlog("ERROR in Socket Creation : <$NetDevice[$NetDeviceID]{'Name'} -> $!");
    return("ERROR in Socket Creation : <$NetDevice[$NetDeviceID]{'Name'} -> $!");
  }
}