Trait for objects that can configure a serial port.
The simplest option is to pass a
u32, which is used to set the baud rate of the port.
That will also configure a character size of 8 bits with 1 stop bit,
and it disables paritity checks and flow control.
For more control, it is possible to pass a
Fn(Settings) -> std::io::Result<Settings>.
To open a serial port without modifying any settings, pass