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Setting port numbers on SMS messages

Posted: Thu Aug 17, 2006 2:52 pm

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Joined: 11 Aug 2004

Posts: 237

Source and destination port numbers (similar to TCP/IP port numbers) can be set on SMS messages. The purpose of this is to direct an SMS message at a specific application on the phone.

The MIDP 2.0 API allows a Java Midlet running on a phone to listen on a configurable port number. When an SMS arrives in on that port number the application is started automatically and the SMS content passed to the application.

A sample Provato client is shown below setting the SMS port numbers (usually the source port number is ignored).

Code:

package ie.ncl.provato.examples;

import ie.ncl.vivato.client.soap.VivatoSoapClient;
import ie.ncl.vivato.client.VivatoClientException;
import ie.ncl.vivato.message.VivatoMessage;
import ie.ncl.vivato.message.SmsAttributes;

public class PortExample
{
public static void main(String args[]) throws VivatoClientException
{
VivatoSoapClient client = new VivatoSoapClient();

client.setServerUrl("http://localhost:8080/provato/soap");
client.setApplicationName("portExample");
client.connect();

VivatoMessage msg = new VivatoMessage();

msg.setContentType("text/plain");
msg.setContent("Hello world!");
msg.setDestination("+353871234567");

msg.setStringAttribute(SmsAttributes.SOURCE_PORT,"65535");
msg.setStringAttribute(SmsAttributes.DESTINATION_PORT,"65534");

client.sendMessage(msg);
client.close();
}
}

Note when a port number is set on a message a header called a User Data Header is placed at the beginning of the text/binary message and contains the source and destination port numbers as shown below in the actual hex dump of the message sent to the phone:

00 00 00 00 01 01 30 38 37 31 32 33 34 35 36 37
00 40 00 00 00 00 00 00 00 00 13 06 05 04 FF FF
FF FE 48 65 6c 6c 6f 20 77 6f 72 6c 64 21

Setting port numbers on SMS messages

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