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Library for Decode/Encode SMS PDU

Eduard Gomolyako

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18 Oct 2012CPOL

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Library for decoding and encoding mobile short messages to/from SMS protocol data unit

Last Updates

You can find some community fixes mentioned on comments section on Project Home at Google Code[^].

Introduction

The smspdulib library is intended for more transparent interaction with SMS PDU. This thought over hierarchy of classes will allow you to create new classes for other types of short messages using the realized base functionality.

At present, the following types of short messages are supported: status report, SMS (with long (large) SMS parts support).

Hierarchy of Classes

Classes hierarchy

Sample Code

This example shows you how to decode PDU.

C#

SMSType smsType = SMSBase.GetSMSType(pduSource);
switch (smsType) {
    case SMSType.SMS:
        SMS sms = new SMS();
        SMS.Fetch(sms, ref pduSource);
        //Use instance of SMS class here
        break;
    case SMSType.StatusReport:
        SMSStatusReport statusReport = new SMSStatusReport();
        SMSStatusReport.Fetch(statusReport, ref pduSource);
        //Use instance of SMSStatusReport class here
        break;
}

This example show you how to encode SMS to PDU.

C#

SMS sms = new SMS();
sms.Direction = SMSDirection.Submited;
sms.PhoneNumber = &quot;+74951234567&quot;;
sms.ValidityPeriod = new TimeSpan(4, 0, 0, 0);
sms.Message = &quot;Me message here!&quot;;
string pduSource = sms.Compose(SMS.SMSEncoding.UCS2);

Useful Links

Updated

Updated Decode7bit method: Fixed some bugs (see comments)
PopDate method now doesn't recognize time zone because some phones send strange stuff

Please help me find more detailed specification of PDU format and TP-SCTS format.

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Written By

Eduard Gomolyako

Chief Technology Officer

Russian Federation

This member has not yet provided a Biography. Assume it's interesting and varied, and probably something to do with programming.

Comments and Discussions

Re: Could I use this library in C/C++ environment

Eduard Gomolyako3-Sep-08 19:30

Eduard Gomolyako

3-Sep-08 19:30

.net environment only.

Best, Ed.

banuponni7-Aug-08 4:50

7-Aug-08 4:50

I'm doing project in SMS sending with PDU mode. now i'm checking manually using hyper terminal. here is my pdu code. when i pass this code in hyper terminal its not working it display "ERROR". here i'm using motorola mobile for sending msg. Rather than i need to send msg more than 160 character so plz check it and reply me soon its urgent.

AT
k
AT+CMGF=0
k
AT+CMGS=154
079119891440446451000C811989567198550000FFA00608044A210201E8329BFD4697D9EC37BACC66BFD16536FB8D2EB3D96F7499CD7EA3CB6CF61B5D66B3DFE8329BFD4697D9EC37BACC66BFD16536FB8D2EB3D96F7499CD66BFD16536FB8D2EB3D96F7499CD7EA3CB6CF61B5D66B3DFE8329BFD4697D9EC37BACC66BFD16536FB8D2EB3D96F7

so many sites i refer it and check that too but no result. can any one tell me y itis?. actually what problem isit in AT commands or PDU code. Reply me soon its very urgent to finish it. plz check it and reply me plz.

banuponni7-Aug-08 4:49

7-Aug-08 4:49

I'm doing project in SMS sending with PDU mode. now i'm checking manually using hyper terminal. here is my pdu code. when i pass this code in hyper terminal its not working it display "ERROR". here i'm using motorola mobile for sending msg.

AT
k
AT+CMGF=0
k
AT+CMGS=154
079119891440446451000C811989567198550000FFA00608044A210201E8329BFD4697D9EC37BACC66BFD16536FB8D2EB3D96F7499CD7EA3CB6CF61B5D66B3DFE8329BFD4697D9EC37BACC66BFD16536FB8D2EB3D96F7499CD66BFD16536FB8D2EB3D96F7499CD7EA3CB6CF61B5D66B3DFE8329BFD4697D9EC37BACC66BFD16536FB8D2EB3D96F7

so many sites i refer it and check that too but no result. can any one tell me y itis?. actually what problem isit in AT commands or PDU code. Reply me soon its very urgent to finish it. plz check it and reply me plz.

Destinition Port

Baxtiyor17-Jul-08 20:29

17-Jul-08 20:29

Здравствуйте,
Пожалуйста помогите, я не могу поставить порт отправление, можно ли это реализовать,
наверно порт определяется внутри UDH. если знаете помогите пожалуйста!!!

i'm student beginner c#

Re: Destinition Port

Eduard Gomolyako17-Jul-08 20:35

Eduard Gomolyako

17-Jul-08 20:35

Порт действительно опрделяется в user data header'е, но я не знаю какие еще данные должны быть в этом заголовке, кроме самого порта.

если Вы отправляете SMS через соединение с сотовым телефоном, то рекомендую вам написать приложение на j2me, где с помощью j2me api сформировать sms запрос на какой-нибудь порт и отправить его себе же. затем найти это сообщение во входящих и разобрать user data header там должно быть не больше двух int'ов.

Альтернативный вариант — почитать документацию по user data header и sms port.

Удачи.

Best, Ed.

Re: Destinition Port

Baxtiyor17-Jul-08 20:42

17-Jul-08 20:42

Большое Вам спасибо, я написал софт для мобильник на j2me принимающий смс с определенного порта, теперь я должен написать отправляющий софт из компьютера с определенного порта.
еще раз спасибо Вам...

i'm student beginner c#

Re: Destinition Port

Eduard Gomolyako17-Jul-08 20:37

Eduard Gomolyako

17-Jul-08 20:37

http://adywicaksono.wordpress.com/2008/02/10/sending-sms-to-j2me-application/[^]

Best, Ed.

Re: Destinition Port [modified]

Baxtiyor17-Jul-08 22:01

17-Jul-08 22:01

Спасибо, я почти разобрался,
а Вы не знаете порт на всех телефонах одинаковый (т.е. все поддерживает)?.

i'm student beginner c#

modified on Friday, July 18, 2008 4:18 AM

Re: Destinition Port

Eduard Gomolyako17-Jul-08 22:58

Eduard Gomolyako

17-Jul-08 22:58

Нет, не знаю. Точнее, я не понимаю о чем Вы, попробуйте выразиться яснее.

Best, Ed.

Re: Destinition Port

Baxtiyor17-Jul-08 23:10

17-Jul-08 23:10

Спасибо разобрался, на всех работает окажутся.

i'm student beginner c#

Muthuganesh10-Jul-08 18:39

10-Jul-08 18:39

how can i sent the concatenated message using this library will u explain me???

thanks

sakthif129-Nov-08 18:47

29-Nov-08 18:47

Hey nice work friend.
It allows only 70 characters to send.
Kindly tell us what to do when a msg with morethan 70 characters to send? Smile | :)

Smile | :)

sdfsd

Re: long message??

Eduard Gomolyako1-Dec-08 1:43

Eduard Gomolyako

1-Dec-08 1:43

As I remeber, you've need to split message on parts with 70 characters, set InParts property to true and specifiy the same InPartsID for all your message parts.

Best, Ed.

How to set Sender

yarns7-Jul-08 0:20

7-Jul-08 0:20

Hi,

any chance to set "sender" field?

Greetings

Re: How to set Sender

Eduard Gomolyako7-Jul-08 0:28

Eduard Gomolyako

7-Jul-08 0:28

Hi,

i use this library for sending messages from cellphone via COM-port (bluetooth connection) and phone needs PDU without sender number, phone sets it itself. You can modify library code to achive desired result. See Useful Links at the bottom of the article.

Best whishes.

Best, Ed.

Encode PDU Fail

jamesng7423-Jun-08 20:09

23-Jun-08 20:09

Hi Eduard,

I found bug, while encoding & decoding PDU, using your smspdulibrary.
below is my code:

Firstly: Encode PDU

<br />
     SMS sms = new SMS();<br />
     sms.Direction = SMSDirection.Submited;<br />
     sms.PhoneNumber = "+628121234567";<br />
     sms.ServiceCenterNumber = "+6281100000";<br />
     sms.ValidityPeriod = new TimeSpan(2, 0, 0);<br />
     sms.StatusReportIndication = true;<br />
     sms.Message = "Hello world";<br />
     string strPDU = sms.Compose(SMS.SMSEncoding._7bit);<br />
<br />
     //strPDU is now: 0031000C9126181232547600001700<br />

Secondly decode this strPDU :

<br />
                SMS sms2 = new SMS();<br />
                SMS.Fetch(sms2, ref strPDU );<br />
                string strDecode = sms2.Message;<br />

i found, the value of strDecode == null...

Why? is it bug of smspdu library?

Re: Encode PDU Fail

Eduard Gomolyako23-Jun-08 20:17

Eduard Gomolyako

23-Jun-08 20:17

Hi James,

I think this is a bug, but i have no time to figure out problem. I (and all other library users i think) will be very much appreciated for help.

Best, Ed.

Re: Encode PDU Fail

jamesng7424-Jun-08 15:39

24-Jun-08 15:39

Eduard, I think you forgot something
you defined a method only for SMSEncoding.UCS2.
you did not define a method for 7bits encoding.

public virtual string Compose(SMSEncoding messageEncoding)
        {
            .....
            .....

            byte[] messageBytes = null;

            switch (messageEncoding)
            {
                case SMSEncoding.UCS2:
                    messageBytes = EncodeUCS2(_message);
                    break;
                default:
                    messageBytes = new byte[0];
                    break;
            }

            ......
            ......            

            return encodedData.ToUpper();
        }

for SMSEncoding.UCS2 you used: Encoding.BigEndianUnicode.GetBytes

public static byte[] EncodeUCS2(string s)
{
    return Encoding.BigEndianUnicode.GetBytes(s);
}

I wanna help, but i dont know what Encoding should be used for SMSEncoding._7bit

Sorry,..

Re: Encode PDU Fail

Eduard Gomolyako24-Jun-08 20:57

Eduard Gomolyako

24-Jun-08 20:57

Oh yeap. Try to implement 7 bit encoding using an articles from "Useful links" section or find ready solution.

Sorry, but i have no time. Good luck.

Best, Ed.

Member 339753130-May-08 16:43

30-May-08 16:43

Hi Ed,

Now, i can encode sms to pdu

SMS mysms = new SMS();
mysms.Direction = SMSDirection.Submited;
mysms.PhoneNumber = "+6281212345678";
mysms.ValidityPeriod = new TimeSpan(5, 0, 0, 0);
mysms.Message = "Hello";
string pduTxt = mysms.Compose(SMS.SMSEncoding.UCS2);

How do i send sms ?

Eduard Gomolyako1-Jun-08 19:57

Eduard Gomolyako

1-Jun-08 19:57

Hi.

This library doesn't respond to sending or receiving requirements, only encode/decode functionality.
So, you can use SerialPort class to send and receive AT commands from your cell phone or use special sms protocol to sen messages via sms provider. For both methods you need encoding and decoding message to/from PDU format.

My best wishes.

Best, Ed.

how to handle USSD?

jamesng7416-Apr-08 18:42

16-Apr-08 18:42

i'm sorry,
i dont know this is a correct place to ask about USSD or not.
Does anyone know, how to handle USSD (Unstructured Supplementary Service Data)?

Re: how to handle USSD?

Eduard Gomolyako16-Apr-08 20:57

Eduard Gomolyako

16-Apr-08 20:57

I have not appropriate hardware for testing, but have some knowledges. Please, try to describe what is your problem.

You plan to work with USSD through cell phone or network SMS protocol?

Best, Ed.

Re: how to handle USSD?

jamesng7417-Apr-08 22:03

17-Apr-08 22:03

i plan to create an application to work with USSD through cell phone (siemens c55).

For example,
My GSM provider, provide a USSD tools to transfer voucher between customers. than, i want to transfer a voucher to my friend.

below is current process (manually):
1. from my cell phone, i dial a USSD number such as: *123#
2. then my phone display a USSD message. i.e "input phone number"
3. i click button "answer"
4. my cell phone display a text box:
5. input my number: +1233453455
6. then click OK
... etc

How to create a program like that?

Thanks for reply.

Re: how to handle USSD?

Eduard Gomolyako18-Apr-08 1:09

Eduard Gomolyako

18-Apr-08 1:09

Okay. First of all you need to establish connection between application and phone. In my case, i pair phone with computer via bluetooth service and setup serial port connection. In "phone and modem options" in control panel I've see port COM21. When I connect phone via usb cable I've see COM6 port at "phone and modem options".

I wrote simple program that send "AT" command to phone and phone replies "AT" to me using SerialPort .net 2.0 class. With default settings: bit-rate and so on.

When you'll achieve same result, I'll continue my tutorial.

Best, Ed.

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