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In testing on real hardware (Fomu), I was missing a lot of "tail end" packets... like, a *lot* of them. This prevented clients from getting the full body, hanging up, etc etc. This seems to be related to the 64B packet size of the USB ACM CDC TLA WTF protocol we're using under the hood. I haven't checked the gateware, but it's *acting like* it doesn't send the packet until there's >64B in the buffer. (Or maybe 64 exactly, and I was doing my math wrong before.) Luckily, we haven't been using "Stream ID zero", so we can redefine Not TCP such that every packet begins with a nonzero byte (stream ID), and zero bytes between packets are ignored. Then, pad on the device side, and *wham*, working. (Mostly. The LED endpoint doesn't always want to finish its job; needs more investigation.)
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The Real Deal. Add the serial proxy program and padding.
Link to #5