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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

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Comments and Discussions

Re: SMS to e-mail

speaderDA25-Nov-08 13:47

25-Nov-08 13:47

Looking at the library you have put together, I can see that I can send an SMS message to a phone number. What I would like to know is does your library support sending an SMS message to an email address?

Re: SMS to e-mail

Eduard Gomolyako25-Nov-08 19:24

Eduard Gomolyako

25-Nov-08 19:24

I understand, but I don't know how to decode email address in sms PDU. See links at the end of the article, may be you can find answer there.

Best, Ed.

Alphanumeric address decoding

benetnash8-Sep-08 3:31

8-Sep-08 3:31

Hi!
Could you update your code, to recognize alphanumerical addresses and decode it?
I used youd modified code for that:

public static string PopAddress(ref string source, int length)
       {
           string address = source.Substring(0, length);

           source = source.Substring(address.Length);

           byte addressType = PopByte(ref address);

           if (0x09 == addressType >> 4) {
               address = "+" + ReverseBits(address).Trim('F');
           } else if (0x0D == addressType >> 4) {
               /* alphanumeric address */
               address = Decode7bit(address, (int)Math.Truncate(address.Length * 4.0 / 7.0));
           } else {
               address = ReverseBits(address).Trim('F');
           }

           return address;
       }

Best regards
benetnash

Re: Alphanumeric address decoding

Eduard Gomolyako8-Sep-08 3:51

Eduard Gomolyako

8-Sep-08 3:51

Hi! Thank you for advice!

I think I will create an open source project on codeplex or google code and you will be able make changes by yourself.

Best, Ed.

Re: Alphanumeric address decoding

Audi Nugraha1-Dec-10 2:51

1-Dec-10 2:51

How do you get

(int)Math.Truncate(address.Length * 4.0 / 7.0)

?

Thanks in advance Big Grin | :-D

Big Grin | :-D

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

John Yueh3-Sep-08 17:39

3-Sep-08 17:39

Hi there,

Can this library be use in C/C++ environment or could anyone suggest library/open source of this kind? Thanks!

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.

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