Thanks for every ones help. I got it working here's the working code. I had to remove from the original code the line with print <$cl>; I also had to alter each line to have a leading [ and a trailing ], it's now working. Working code:

#!/usr/bin/perl
use strict;
use IO::Socket::SSL; #qw(debug3);  
use JSON::SL;
use Data::Dumper;

print "JSON Stream parser test\r\n";

my $p = JSON::SL->new;

#Look for everything past the first JSON pointer
$p->set_jsonpointer(["/^"]); 

   # simple client
    my $cl = IO::Socket::SSL->new(
        PeerAddr     => 'example.com',
        PeerService     => 'https',
        PeerPort     => 443,
        Proto         => 'tcp',
        Reuse        => 1
        ); 
        die "no connection" unless $cl -> connected();
        
    print $cl "GET /stream/report?token=IMNOTAREALTOKEN HTTP/1.0\r\n\r
+\n";
     #print <$cl>; 
    
    #local $/ = \5; #read only 5 bytes at a time

    while (my $line = <$cl>) {
        chomp($line);        #Remove new line characters
        $line = "[$line],\n";     # Add leading [ and trailing ], so i
+t will parse correctly
        
        if ($line =~ m/{"\w{14}/) {
           print "Received:\n$line";       
           $p->feed($line); #parse what you can fetch anything that co
+mpleted the parse and matches the JSON Pointer
            while (my $obj = $p->fetch) {
                print Dumper($obj);
                print "$obj->{Value}{flowStartSeconds}: $obj->{Value}{
+senderCallsign}\n";
            }
        }
    }
    
    close $cl;
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