libmodbus 1.0.1

libmodbus bindings for Rust
Documentation 
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use clap::{App, Arg, ArgMatches};
use libmodbus::{Modbus, ModbusClient, ModbusRTU, ModbusTCP, ModbusTCPPI};

#[derive(Debug, Eq, PartialEq)]
enum Backend {
    TCP,
    TCPPI,
    RTU,
}

const CLIENT_ID: u8 = 247;

fn run(matches: &ArgMatches) -> Result<(), Box<dyn std::error::Error>> {
    let backend;
    let mut modbus: Modbus;

    match matches.value_of("backend").unwrap() {
        "tcp" => backend = Backend::TCP,
        "tcppi" => backend = Backend::TCPPI,
        "rtu" => backend = Backend::RTU,
        _ => unreachable!(), // because clap ensures that for us
    }

    match backend {
        Backend::RTU => {
            let serial_interface = matches
                .value_of("serial_interface")
                .unwrap_or("/dev/ttyUSB1");
            modbus = Modbus::new_rtu(&serial_interface, 9600, 'N', 8, 1)?;
            modbus.set_slave(CLIENT_ID)?;
        }
        Backend::TCP => {
            modbus = Modbus::new_tcp("127.0.0.1", 1502)?;
        }
        Backend::TCPPI => {
            modbus = Modbus::new_tcp_pi("::1", "1502")?;
        }
    }

    modbus.set_debug(true)?;
    modbus.connect()?;

    let mut dest = vec![0u8; 100];
    modbus.read_bits(0, 1, &mut dest)?;
    println!("{:?}", &dest);

    Ok(())
}

fn main() {
    let matches = App::new("simple-client")
        .version(env!("CARGO_PKG_VERSION"))
        .about("Simple Modbus Client with support for the different contextes (rtu, tcp, tcppi)!")
        .author("Stefan Müller (zzeroo) <s.mueller@it.kls-glt.de>")
        .arg(
            Arg::with_name("backend")
                .help("which backend shoud be used")
                .long("backend")
                .short("b")
                .possible_values(&["rtu", "tcp", "tcppi"])
                .takes_value(true)
                .required(true),
        )
        .arg(
            Arg::with_name("serial_interface")
                .help("which backend shoud be used")
                .long("serial_interface")
                .short("s")
                .takes_value(true)
                .required(false),
        )
        .get_matches();

    if let Err(ref err) = run(&matches) {
        println!("Error: {}", err);

        std::process::exit(1)
    }
}