You don't want to compare the characters with hex(0x00), because this is just a 0. Comparing arbitrary strings with 0 won't work, since non-numeric ones will evaluate to 0. You want to say something like
$response == "\x00"
Beyond that little problem, you're not checking the status in the recv call.
You might try instead letting the getline call work and get your data a record at a time, by setting the input record separator $/ to NUL:
local $/ = "\x00";
$response = $socket->getline;
if ($socket->eof) { ... }
update: you may have been thinking about chr(0) which returns "\x00".
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