Send EMS messages using smsj api

I am new to Java programming. I used smsj api to send messages from PC to mobile via gsm modem. I have successfully sent text messages using SmsSender.sendTextSms(msg, reciever, sender), as well as unicode messages using SmsSender.sendUnicodeTextSms("smsj हिन्दी मेसेज", reciever);.

They say they support EMS messages too. I am trying to send images (black and white) and audio clips through this. But I can’t figure out how to do this.

the documentation shows that there is a classEmsMessagethat implementsSmsMessageBut I could not find information on how to use it. I also went through my forum, but again did not find a solution.

Hoping someone could direct me to this.

this is my code for sending text messages.

public class SendMessage  {

    public void send() {
    try{
        SmsSender smsSender = SmsSender.getGsmSender("COM14");
            String msg ="smsj test message";        
            String reciever = "919790968633"; 
            String sender ="919176968289";      
            smsSender.connect();

            smsSender.sendTextSms(msg, reciever, sender);  //simple text message

                   smsSender.sendUnicodeTextSms("smsj हिन्दी मेसेज", reciever); //unicode message

            smsSender.disconnect();

    } catch(IOException i){
        i.printStackTrace();
        System.out.println("i");
    } catch(SmsException s){
        s.printStackTrace();
        System.out.println("s");
    }
    }

    public static void main(String args[]){
        SendMessage app = new SendMessage();
        app.send();
    }


}

ems.. .

     EmsMessage ems = new EmsMessage();
     ems.addText(msg);
     SmsMessage sms ;
     sms=ems;
     smsSender.sendSms(sms, reciever, sender);

:

60 [main] INFO org.marre.sms.transport.gsm.SerialComm - >> AT+CMGF=0    
261 [main] INFO org.marre.sms.transport.gsm.SerialComm - << 
261 [main] INFO org.marre.sms.transport.gsm.SerialComm - << OK
Exception in thread "main" java.lang.NullPointerException
    at org.marre.sms.transport.gsm.GsmTransport.send(GsmTransport.java:175)
    at org.marre.SmsSender.sendSms(SmsSender.java:551)
    at org.marre.SendMessage.send(SendMessage.java:44)
    at org.marre.SendMessage.main(SendMessage.java:58)

- EmsMessage SmsMessage?