Glenn Maynard 849fd7a975 Simplify overlapped I/O handling, and add a command timeout.
If we don't get a response from a command in a while, resend it.  This doesn't
normally happen (it only happened during firmware development), but it makes
command sending more robust, so let's keep it.  This also uses a single OVERLAPPED
for a whole command, which is simpler.
2019-01-03 18:13:51 -06:00
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