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my $port = Device::SerialPort->new("/dev/cu.usbserial");
my $port = Device::SerialPort->new("/dev/tty.usbserial");
my $port = Device::SerialPort->new("/dev/ttys0");
my $port = Device::SerialPort->new("/dev/ttys1");

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```
$port->write_settings || undef $port;
```