Try to syswrite to socket instead of printing to it, or at least do
$socket->autoflush(1). That way you'll know you're not suffering from buffering.
And just for the first test, snoop what the java client is
sending, construct a string that matches that exactly (using
the \xhh notation), and send that. Yes, it's not maintainable,
but it will limit the number of things you're trying to debug at the same time.
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