libmodbus-rs 0.4.3

Binding to libmodbus. Libmodbus is a free software library to send/receive data with a device which respects the Modbus protocol. This library can use a serial port or an Ethernet connection. http://libmodbus.org/ 
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extern crate clap;
extern crate libmodbus_rs;

use libmodbus_rs::{Modbus, ModbusClient, ModbusRTU, ModbusTCP, ModbusTCPPI};
use libmodbus_rs::{MODBUS_RTU_MAX_ADU_LENGTH, MODBUS_TCP_MAX_ADU_LENGTH};
use libmodbus_rs::errors::*; // for the `Result<T>` type
use std::env;
use clap::{App, Arg, ArgMatches};

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

const SERVER_ID: u8 = 247;

fn run(matches: &ArgMatches) -> Result<()> {
    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(SERVER_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 response_register = vec![0u16; MODBUS_RTU_MAX_ADU_LENGTH as usize];
    modbus.read_registers(0, 30, &mut response_register)?;

    println!(">> Registers: \n{:?}", &response_register);

    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)
    }
}