<dependency>
    <groupId>io.netty</groupId>
    <artifactId>netty-all</artifactId>
    <version>4.1.77.Final</version>
</dependency>

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;

public static ByteBuf strToBytoBuf(String strData)
{
    return Unpooled.wrappedBuffer(strData.getBytes(StandardCharsets.UTF_8));
}
public static String ByteBufToStr(ByteBuf byteBuf)
{
    return byteBuf.toString(CharsetUtil.UTF_8);
}

ModbusClient modbusClient = null;

modbusClient = new ModbusClient(threadArgument.IP,
        Constant.MODUBUS_SERVER_PORT);
threadArgument.modbusClient.setConnectionTimeout(180000);
threadArgument.modbusClient.Connect();

int[] soc = modbusClient.ReadInputRegisters(Constant.POS_1, Constant.POS_1_1);

System.out.println(soc[0]);
System.out.println(Arrays.toString(soc));

<dependency>
    <groupId>commons-cli</groupId>
    <artifactId>commons-cli</artifactId>
    <version>1.4</version>
</dependency>

import org.apache.commons.cli.*;

Options options = new Options();
Option input = new Option("t", "type", true, "running type");
input.setRequired(true);
options.addOption(input);

CommandLineParser parser = new DefaultParser();
HelpFormatter formatter = new HelpFormatter();
CommandLine cmd = null;

try {
    cmd = parser.parse(options, args);
} catch (ParseException e) {
    System.out.println(e.getMessage());
    formatter.printHelp("utility-name", options);

    System.exit(1);
}

String runtype = cmd.getOptionValue("type");

if (runtype.equals("1")) {