Don't flush the TX buffer right before transmit #143
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This causes random trucated writes, where only 1 or 2 bytes of the packet are transmitted by the USB serial chip. I'm not exactly sure why; perhaps there is some kind of buffering that causes the flush command and write command to make it to the USB device out-of-order. In any case, I cannot see any reason why a flush should be necessary, especially on the TX buffer, so it's easy to remove
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Addresses Issue #142