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Fix "txpacket() randomly gets stuck on Linux" #621

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Fix "txpacket() randomly gets stuck on Linux" #621

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Commits on Mar 21, 2024

  1. Fix "txpacket() randomly gets stuck on Linux" 

    It turned out that Python SDK calls termios.tcdrain() to clear remaining data
in the serial port. Since tcdrain() is a blocking operation, it can paralyze
the Python interpreter execution for a few seconds.

On the other hand, C/C++ SDK uses `tcflush()` for the same purpose, so simply
dicards the data not transmitted yet. Fix Python SDK to do the same.

Signed-off-by: Fujimoto Seiji <[email protected]>
    @fujimotos
    fujimotos committed Mar 21, 2024
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