Send At Command to gsm modem with Java

Question

I am trying to make a program to send a sms. I wrote the program but doesn't successfully send the message. My program send an At command to the Port COM in my computer but I do not get a response from my gsm modem. I am using COM terminal (Temp pro...) to send sms with the at command and I am able to send sms. Therefore I don't know why the program can't send a sms.

import java.io.*;
import java.util.*;
import gnu.io.*;

public class prawiefinal {
    static Enumeration portList;
    static CommPortIdentifier portId;
    static String messageString = "AT+CMGF=1 \r";
    static String messageString2 = "AT+CMGS=\"+4866467xxxx\"\r";
    static String messageString3 = "TESting \u001A\r\n";
    static SerialPort serialPort;
    static OutputStream outputStream;


    public static void main(String[] args) throws InterruptedException {
        portList = CommPortIdentifier.getPortIdentifiers();

        while (portList.hasMoreElements()) {

            portId = (CommPortIdentifier) portList.nextElement();
            if (portId.getPortType() == CommPortIdentifier.PORT_SERIAL) {

                if (portId.getName().equals("COM3")) {

                    try {
                        serialPort = (SerialPort)
                            portId.open("COM3", 2000);
                    } catch (PortInUseException e) {System.out.println("err");}
                    try {
                        outputStream = serialPort.getOutputStream();
                    } catch (IOException e) {e.printStackTrace();}
                    try {
                        serialPort.setSerialPortParams(9600,
                                SerialPort.DATABITS_8,
                                SerialPort.STOPBITS_1,
                                SerialPort.PARITY_NONE);
                    } catch (UnsupportedCommOperationException e) {e.printStackTrace();}
                    try {
                        outputStream.write(messageString.getBytes());
                        Thread.sleep(3000); 
                        outputStream.flush();

                        outputStream.write(messageString2.getBytes());  
                        Thread.sleep(3000);  
                        outputStream.flush();

                        outputStream.write(messageString3.getBytes()); 
                        Thread.sleep(3000);  
                        outputStream.write(26);
                        outputStream.flush();
                        System.out.println(messageString);  
                        Thread.sleep(3000);






                        outputStream.close();
                        serialPort.close();

                    } catch (IOException e) {e.printStackTrace());}
                }
            }
        }
    }
}

Instead of using println("err3") put an e.printStackTrace() in your catch clause. It may explain better what the exception is. Do that in all catch clauses, edit your question and add the stack trace to it. Remember to properly format it (not using backticks, but using the {} button). — RealSkeptic

przemo199980 przemo199980 · Accepted Answer · 2016-09-14T13:29:07

Ok I make the program and I can send a SMS. I use CTRL+Z and Enter that was a problem. :D

import java.io.*; 
import java.util.*; 
import gnu.io.*; 

public class SMSsender { 
static Enumeration portList; 
static CommPortIdentifier portId; 
static String messageString1 = "AT";
static String messageString2 = "AT+CPIN=\"7078\"";
static String messageString3 = "AT+CMGF=1"; 
static String messageString4 = "AT+CMGS=\"+4866467xxxx\"";


static String messageString5 = "TESTY2";
static SerialPort serialPort;
static OutputStream outputStream;
static InputStream inputStream;
static char enter = 13;

static char CTRLZ = 26;
public static void main(String[] args) throws InterruptedException {
 portList = CommPortIdentifier.getPortIdentifiers();



while (portList.hasMoreElements()) {

    portId = (CommPortIdentifier) portList.nextElement();
    if (portId.getPortType() == CommPortIdentifier.PORT_SERIAL) {

         if (portId.getName().equals("COM3")) {

            try {
                serialPort = (SerialPort)
                    portId.open("COM3", 2000);
            } catch (PortInUseException e) {System.out.println("err");}
            try {
                outputStream = serialPort.getOutputStream();
                inputStream = serialPort.getInputStream();
            } catch (IOException e) {e.printStackTrace();}
            try {
                serialPort.setSerialPortParams(9600,
                    SerialPort.DATABITS_8,
                    SerialPort.STOPBITS_1,
                    SerialPort.PARITY_NONE); 
            } catch (UnsupportedCommOperationException e) {e.printStackTrace();}
            try { 

                outputStream.write((messageString1 + enter).getBytes());


                Thread.sleep(100); 
                outputStream.flush();

                outputStream.write((messageString2 + enter).getBytes()); 

                 Thread.sleep(100); 
                 outputStream.flush();

                outputStream.write((messageString3 + enter).getBytes());

                Thread.sleep(100); 
                outputStream.flush(); 




                outputStream.write((messageString4 + enter).getBytes()); 

                Thread.sleep(100);  
                outputStream.flush();

               outputStream.write((messageString5 + CTRLZ).getBytes());  

                outputStream.flush(); 
                Thread.sleep(100); 


    System.out.println("Wyslano wiadomosc");  
    Thread.sleep(3000);


    outputStream.close();
    serialPort.close();
    System.out.println("Port COM zamkniety"); 

            } catch (IOException e) {e.printStackTrace();}
        }
    }
}

} }

Send At Command to gsm modem with Java

1 Answers