>I also know that the $status value returned by both
>Read() and Write() is empty (I think that means success).
If you only think that, I really think you should check the documentation before you go any further.
Everything that you call, check its return. Everything you do, print a line to see if it worked or died there.
There's stuff you say you "know from debugging" -- why don't you post that stuff here?
Every bit of code is either naturally related to the problem at hand, or else it's an accidental side effect of the fact that you happened to solve the problem using a digital computer.
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