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    Modbus4J. ListenerTest (TCP). java.net.BindException

    Modbus4J general discussion
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    • ramonhlR
      ramonhl
      last edited by

      Hello.
      I am testing the ListenerTest.java in Linux computer and Eclipse 4.3.2
      The code is the next:

      package com.ramonahl.test;

import java.util.Random;

import com.serotonin.modbus4j.BasicProcessImage;
import com.serotonin.modbus4j.ModbusFactory;
import com.serotonin.modbus4j.ModbusSlaveSet;
import com.serotonin.modbus4j.ProcessImage;
import com.serotonin.modbus4j.ProcessImageListener;
import com.serotonin.modbus4j.code.DataType;
import com.serotonin.modbus4j.code.RegisterRange;
import com.serotonin.modbus4j.exception.IllegalDataAddressException;
import com.serotonin.modbus4j.exception.ModbusInitException;
import com.serotonin.modbus4j.ip.IpParameters;

public class ListenerTest {
    static Random random = new Random();
    static float ir1Value = -100;

    public static void main(String[] args) throws Exception {
        // SerialParameters params = new SerialParameters();
        // params.setCommPortId("COM1");
        // params.setPortOwnerName("dufus");
        // params.setBaudRate(9600);

        IpParameters params = new IpParameters();
        String host = "127.0.0.1";
		params.setHost(host );

        ModbusFactory modbusFactory = new ModbusFactory();
        // ModbusListener listener = modbusFactory.createRtuListener(processImage, 31, params, false);
        // ModbusListener listener = modbusFactory.createAsciiListener(processImage, 31, params);
        final ModbusSlaveSet listener = modbusFactory.createTcpSlave(false);
        // ModbusSlave listener = modbusFactory.createUdpSlave(processImage, 31);

        // Add a few slave process images to the listener.
        listener.addProcessImage(getModscanProcessImage(2));
        listener.addProcessImage(getModscanProcessImage(3));
        listener.addProcessImage(getModscanProcessImage(5));
        listener.addProcessImage(getModscanProcessImage(9));

        // When the "listener" is started it will use the current thread to run. So, if an exception is not thrown
        // (and we hope it won't be), the method call will not return. Therefore, we start the listener in a separate
        // thread so that we can use this thread to modify the values.
        new Thread(new Runnable() {
            public void run() {
                try {
                    listener.start();
                }
                catch (ModbusInitException e) {
                    e.printStackTrace();
                }
            }
        }).start();

        while (true) {
            synchronized (listener) {
                listener.wait(200);
            }

            for (ProcessImage processImage : listener.getProcessImages())
                updateProcessImage((BasicProcessImage) processImage);
        }
    }

    static void updateProcessImage(BasicProcessImage processImage) throws IllegalDataAddressException {
        processImage.setInput(10, !processImage.getInput(10));
        processImage.setInput(13, !processImage.getInput(13));

        processImage.setInputRegister(20, DataType.FOUR_BYTE_FLOAT, ir1Value += 0.01);

        short hr1Value = ((Number) processImage.getHoldingRegister(80, DataType.TWO_BYTE_BCD)).shortValue();
        processImage.setHoldingRegister(80, DataType.TWO_BYTE_BCD, hr1Value + 1);
    }

    static class BasicProcessImageListener implements ProcessImageListener {
        public void coilWrite(int offset, boolean oldValue, boolean newValue) {
            System.out.println("Coil at " + offset + " was set from " + oldValue + " to " + newValue);
        }

        public void holdingRegisterWrite(int offset, short oldValue, short newValue) {
            System.out.println("HR at " + offset + " was set from " + oldValue + " to " + newValue);
        }
    }

    static BasicProcessImage getModscanProcessImage(int slaveId) {
        BasicProcessImage processImage = new BasicProcessImage(slaveId);
        processImage.setAllowInvalidAddress(false);
        processImage.setInvalidAddressValue(Short.MIN_VALUE);

        processImage.setCoil(10, true);
        processImage.setCoil(11, false);
        processImage.setCoil(12, true);
        processImage.setCoil(13, true);
        processImage.setCoil(14, false);

        processImage.setInput(10, false);
        processImage.setInput(11, false);
        processImage.setInput(12, true);
        processImage.setInput(13, false);
        processImage.setInput(14, true);

        processImage.setBinary(16, true);
        processImage.setBinary(10016, true);

        processImage.setHoldingRegister(10, (short) 1);
        processImage.setHoldingRegister(11, (short) 10);
        processImage.setHoldingRegister(12, (short) 100);
        processImage.setHoldingRegister(13, (short) 1000);
        processImage.setHoldingRegister(14, (short) 10000);

        processImage.setInputRegister(10, (short) 10000);
        processImage.setInputRegister(11, (short) 1000);
        processImage.setInputRegister(12, (short) 100);
        processImage.setInputRegister(13, (short) 10);
        processImage.setInputRegister(14, (short) 1);

        processImage.setBit(RegisterRange.HOLDING_REGISTER, 15, 0, true);
        processImage.setBit(RegisterRange.HOLDING_REGISTER, 15, 3, true);
        processImage.setBit(RegisterRange.HOLDING_REGISTER, 15, 7, true);
        processImage.setBit(RegisterRange.HOLDING_REGISTER, 15, 8, true);
        processImage.setBit(RegisterRange.HOLDING_REGISTER, 15, 14, true);

        processImage.setBit(RegisterRange.INPUT_REGISTER, 15, 0, true);
        processImage.setBit(RegisterRange.INPUT_REGISTER, 15, 7, true);
        processImage.setBit(RegisterRange.INPUT_REGISTER, 15, 8, true);
        processImage.setBit(RegisterRange.INPUT_REGISTER, 15, 15, true);

        processImage.setRegister(RegisterRange.HOLDING_REGISTER, 16, DataType.TWO_BYTE_INT_SIGNED, new Integer(-1968));
        processImage.setRegister(RegisterRange.HOLDING_REGISTER, 17, DataType.FOUR_BYTE_INT_SIGNED,
                new Long(-123456789));
        processImage.setRegister(RegisterRange.HOLDING_REGISTER, 19, DataType.FOUR_BYTE_INT_SIGNED_SWAPPED, new Long(
                -123456789));
        processImage.setRegister(RegisterRange.HOLDING_REGISTER, 21, DataType.FOUR_BYTE_FLOAT, new Float(1968.1968));
        processImage.setRegister(RegisterRange.HOLDING_REGISTER, 23, DataType.EIGHT_BYTE_INT_SIGNED, new Long(
                -123456789));
        processImage.setRegister(RegisterRange.HOLDING_REGISTER, 27, DataType.EIGHT_BYTE_INT_SIGNED_SWAPPED, new Long(
                -123456789));
        processImage.setRegister(RegisterRange.HOLDING_REGISTER, 31, DataType.EIGHT_BYTE_FLOAT, new Double(1968.1968));

        processImage.setRegister(RegisterRange.HOLDING_REGISTER, 80, DataType.TWO_BYTE_BCD, new Short((short) 1234));
        processImage.setRegister(RegisterRange.HOLDING_REGISTER, 81, DataType.FOUR_BYTE_BCD, new Integer(12345678));

        processImage.setRegister(RegisterRange.HOLDING_REGISTER, 12288, DataType.FOUR_BYTE_FLOAT_SWAPPED, new Float(
                1968.1968));
        processImage.setRegister(RegisterRange.HOLDING_REGISTER, 12290, DataType.FOUR_BYTE_FLOAT_SWAPPED, new Float(
                -1968.1968));

        processImage.setRegister(RegisterRange.INPUT_REGISTER, 16, DataType.TWO_BYTE_INT_UNSIGNED, new Integer(0xfff0));
        processImage.setRegister(RegisterRange.INPUT_REGISTER, 17, DataType.FOUR_BYTE_INT_UNSIGNED,
                new Long(-123456789));
        processImage.setRegister(RegisterRange.INPUT_REGISTER, 19, DataType.FOUR_BYTE_INT_UNSIGNED_SWAPPED, new Long(
                -123456789));
        processImage.setRegister(RegisterRange.INPUT_REGISTER, 21, DataType.FOUR_BYTE_FLOAT_SWAPPED, new Float(
                1968.1968));
        processImage.setRegister(RegisterRange.INPUT_REGISTER, 23, DataType.EIGHT_BYTE_INT_UNSIGNED, new Long(
                -123456789));
        processImage.setRegister(RegisterRange.INPUT_REGISTER, 27, DataType.EIGHT_BYTE_INT_UNSIGNED_SWAPPED, new Long(
                -123456789));
        processImage.setRegister(RegisterRange.INPUT_REGISTER, 31, DataType.EIGHT_BYTE_FLOAT_SWAPPED, new Double(
                1968.1968));

        processImage.setRegister(RegisterRange.HOLDING_REGISTER, 50, DataType.EIGHT_BYTE_INT_UNSIGNED, 0);
        processImage.setExceptionStatus((byte) 151);

        // Add an image listener.
        processImage.addListener(new BasicProcessImageListener());

        return processImage;
    }
}

      But when I run the code I can see the next error:

      com.serotonin.modbus4j.exception.ModbusInitException: java.net.BindException: Permiso denegado
      at com.serotonin.modbus4j.ip.tcp.TcpSlave.start(TcpSlave.java:57)
      at com.ramonahl.test.ListenerTest$1.run(ListenerTest.java:48)
      at java.lang.Thread.run(Thread.java:744)
      Caused by: java.net.BindException: Permiso denegado
      at java.net.PlainSocketImpl.socketBind(Native Method)
      at java.net.AbstractPlainSocketImpl.bind(AbstractPlainSocketImpl.java:376)
      at java.net.ServerSocket.bind(ServerSocket.java:376)
      at java.net.ServerSocket.<init>(ServerSocket.java:237)
      at java.net.ServerSocket.<init>(ServerSocket.java:128)
      at com.serotonin.modbus4j.ip.tcp.TcpSlave.start(TcpSlave.java:47)
      ... 2 more

      Do you know How Can I solve this error?

      Thanks in advance.

      1 Reply Last reply Reply Quote 0
      • terrypackerT
        terrypacker
        last edited by

        On linux operating systems you must have the proper privileges to access ports below 1024. Modbus defaults to port 502.

        1 Reply Last reply Reply Quote 0
        • ramonhlR
          ramonhl
          last edited by

          Thanks for the information.
          If I execute Eclipse using the sudo command (administrator) I can run the ListenerTest.

          See you

          1 Reply Last reply Reply Quote 0
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