Ignore error when closing an already closed serial connection #47
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An OSError would be raised when reader and writer threads were concurrently closing the serial connection. One of them would close an already closed connection.
Ideally this would be synchronized so we'd be able to detect an issue closing the connection. In this case a global resource in the system may be broken rendering the system un-usable.
For now we just ignore any issues while closing, not taking a potential later use of the device into account.