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How to test `serialport-rs` for development.
Without hardware:
1. Compilation
2. `cargo test`
With a single unconnected device:
`cargo run --example hardware_check <DEVICE>`
And when wired in a physical loopback mode:
`cargo run --example hardware_check <DEVICE> --loopback`
With two devices connected to each other:
* `cargo run --example hardware_check <DEVICE1> --loopback-port <DEVICE2>`
* Also `cargo run --example heartbeat <DEVICE1> <BAUD>` in one terminal and
`cargo run --example receive_data <DEVICE2> <BAUD>` in another
* Running tests with test cases requiring hardware devices enabled:
```
$ export SERIALPORT_TEST_PORT_1=$(realpath /dev/ttyX)
$ export SERIALPORT_TEST_PORT_2=$(realpath /dev/ttyY)
$ cargo test --features hardware-tests
```
Can also verify trickier settings (like non-standard baud rates) using serial terminal programs
like:
* `screen` (POSIX)
* [CoolTerm](http://freeware.the-meiers.org/) (macOS)
* [RealTerm](https://sourceforge.net/projects/realterm/) (Windows)
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