Solved

Decoding SMS PDU-messages

Posted on 2001-08-29
5
4,954 Views
Last Modified: 2007-11-27
I use Nokia Datasuite and AT-commands to retrieve sms-messages from mobile phone. It returns them in PDU mode like this:

0791534850020200040C915348707795140000108092327123800DD4F29C0E6A97E7F3F0B91C02

That PDU data contains message "Test message!" from number +358407775941

This site has detailed description of that format:
http://www.gsm-gps.de/sms-pdu-mode.html

Now i need somebody to code Delphi prosedure that decodes PDU message into plain text and return message part and senders phone number..

I don't handle bit-shifting etc. very well.. :(

It would help my project VERY VERY much, and i can guarantee that the inventor of that Delphi procedure will be mentioned in my programs credits and manuals..

-Lazyjeff-
email: seppo@sormunen.com

0
Comment
Question by:LazyJeff
  • 2
  • 2
5 Comments
 
LVL 4

Accepted Solution

by:
jeurk earned 300 total points
ID: 6438786
Hi,
Maybe this is what you need...
See you,
John.

it's written by Barna Szternak
mail: barna.szternak@vodafone.hu
the archive can be found here:
http://delphi.planetmirror.com/ftp/d20free/Text2pdu.rar

------------------------------
Dear user!

With this pas file u can converting texts into PDU format easily, and vica versa.

2 functions were developed:

function texttosms(smscenter: string; targetms: string; text: string): Tpdu;
function smstotext(pdu: string): Tsms;

WARNING! The SMSCenter parameter was currently removed from the function due to the ETSI standards...

Eg. if you want to create an sms in pdu format:

pdu:=texttosms('','36309304401','Test message');

Where pdu is a Tpdu variable, pdu[1] is the sms in pdu format, and pdu[2] is the length of the sms.
Eg. you can send the sms via a nokia phone like this:

'AT+CMGS='+pdu[2]+#13+pdu[1]+s, where s is the CTRL+Z character

Reverse way (processing a received sms):

sms:=smstotext(pdu formatted text);

Where sms is a Tsms variable, sms[1] is the smscenter number, sms[2] is the sender, sms[3] is the timestamp, sms[4] is the sms body.


Included 2 types:

Tpdu = array [1..2] of string;
Tsms = array [1..4] of string;


If you have any more problems, or found a bug, please send me a mail: barna.szternak@vodafone.hu

Best regards: Barna Szternak
-------------------------------------

the unit
----------------------
unit Text2pdu;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls,
  Forms, Dialogs, Math;

type
  Tpdu = array [1..2] of string;
  Tsms = array [1..4] of string;
  TText2pdu = class(TComponent)
  private
    { Private declarations }
    prKillEvent: THandle;
  protected
    { Protected declarations }
    procedure Execute;
  public
    { Public declarations }
    constructor Create(aOwner: TComponent);
    destructor Destroy; override;

  published
    { Published declarations }
    function texttosms(smscenter: string; targetms: string; text: string): Tpdu;
    function smstotext(pdu: string): Tsms;
  end;

procedure Register;

implementation

procedure Register;
begin
  RegisterComponents('SMS', [TText2pdu]);
end;

constructor TText2pdu.Create(aOwner: TComponent);
begin
  //inherited Create(True);
  prKillEvent := CreateEvent(nil, false, false, nil);
end;

destructor TText2pdu.Destroy;
begin
  SetEvent(prKillEvent);
  CloseHandle(prKillEvent);
  inherited;
end;

procedure TText2pdu.Execute;
begin
  //inherited Create(True);
end;

function TText2pdu.texttosms(smscenter: string; targetms: string; text: string): Tpdu;
var
  smsc,targ,leng,data : string;
  ses1 : string;
  i,d,e,j,k,n : integer;
  a,b,c : array [1..8] of byte;
  smsh : integer;
  jump : boolean;
  res : Tpdu;

begin
  ses1:=smscenter;
  smsc:=ses1[2]+ses1[1]+ses1[4]+ses1[3]+ses1[6]+ses1[5]+ses1[8]+ses1[7]+ses1[10]+ses1[9]+'F'+ses1[11];
  ses1:=targetms;
  targ:=ses1[2]+ses1[1]+ses1[4]+ses1[3]+ses1[6]+ses1[5]+ses1[8]+ses1[7]+ses1[10]+ses1[9]+'F'+ses1[11];
  ses1:=text;

  j:=0;
  d:=ord(ses1[1]);

  c[8]:=round((d and 128)/128);
  c[7]:=round((d and 64)/64);
  c[6]:=round((d and 32)/32);
  c[5]:=round((d and 16)/16);
  c[4]:=round((d and 8)/8);
  c[3]:=round((d and 4)/4);
  c[2]:=round((d and 2)/2);
  c[1]:=round((d and 1));
  jump:=false;
  for i:=2 to length(ses1) do
  begin
    j:=j+1;
    if j=8 then
    begin
      j:=0;
      jump:=true;
    end;

    d:=ord(ses1[i]);

    a[8]:=round((d and 128)/128);
    a[7]:=round((d and 64)/64);
    a[6]:=round((d and 32)/32);
    a[5]:=round((d and 16)/16);
    a[4]:=round((d and 8)/8);
    a[3]:=round((d and 4)/4);
    a[2]:=round((d and 2)/2);
    a[1]:=round((d and 1));

    if jump=false then
    begin
      for e:=1 to 8-j do
      begin
        b[e]:=c[e];
      end;

      k:=0;

      for e:=8-j+1 to 8 do
      begin
        k:=k+1;
        b[e]:=a[k];
      end;

      n:=128*b[8]+64*b[7]+32*b[6]+16*b[5]+8*b[4]+4*b[3]+2*b[2]+b[1];
      if n>0 then data:=data+inttohex(n,2);

    end;

    jump:=false;

    for e:=1 to 8-j do
    begin
      c[e]:=a[e+j]
    end;

    for e:=8-j to 8 do
    begin
      c[e]:=0;
    end;
  end;
  n:=128*c[8]+64*c[7]+32*c[6]+16*c[5]+8*c[4]+4*c[3]+2*c[2]+c[1];
  if n>0 then data:=data+inttohex(n,2);
  leng:=inttohex(length(text),2);
  res[1]:='0011000B91'+targ+'0000A7'+leng+data;
  smsh:=round(length(res[1])/2-1);
  res[2]:=inttostr(smsh);
  result:=res;
end;

function TText2pdu.smstotext(pdu: string): Tsms;

var
  res : Tsms;
  ins : string;
  smsc,sendr,dt,body : string;
  binb,s,ss,t : string;
  i,j,k,chv : integer;
  smsbody : string;

begin
  ins:=pdu;
  if copy(ins,1,4)='0791' then
  begin
    smsc:=copy(ins,5,12);
    smsc:=smsc[2]+smsc[1]+smsc[4]+smsc[3]+smsc[6]+smsc[5]+smsc[8]+smsc[7]+smsc[10]+smsc[9]+smsc[12];
    res[1]:=smsc;
    sendr:=copy(ins,23,12);
    sendr:=sendr[2]+sendr[1]+sendr[4]+sendr[3]+sendr[6]+sendr[5]+sendr[8]+sendr[7]+sendr[10]+sendr[9]+sendr[12];
    res[2]:=sendr;
    dt:=copy(ins,39,14);
    dt:=dt[2]+dt[1]+'/'+dt[4]+dt[3]+'/'+dt[6]+dt[5]+' '+dt[8]+dt[7]+':'+dt[10]+dt[9]+':'+dt[12]+dt[11]+'.'+dt[14]+dt[13];
    res[3]:=dt;
    body:=copy(ins,55,length(ins)-54);
    for i:=1 to length(body) do
    begin
      case body[i] of
        '0': binb:=binb+'0000';
        '1': binb:=binb+'0001';
        '2': binb:=binb+'0010';
        '3': binb:=binb+'0011';
        '4': binb:=binb+'0100';
        '5': binb:=binb+'0101';
        '6': binb:=binb+'0110';
        '7': binb:=binb+'0111';
        '8': binb:=binb+'1000';
        '9': binb:=binb+'1001';
        'A': binb:=binb+'1010';
        'B': binb:=binb+'1011';
        'C': binb:=binb+'1100';
        'D': binb:=binb+'1101';
        'E': binb:=binb+'1110';
        'F': binb:=binb+'1111';
      end;
    end;
    j:=8;
    t:='';
    for i:=0 to round(length(binb)/8)-1 do
    begin
      s:=copy(binb,i*8+1,8);
      j:=j-1;
      if j=0 then j:=7;
      ss:=copy(s,9-j,j)+t;
      ss:='0'+ss;
      t:=copy(s,1,8-j);
      chv:=0;
      for k:=1 to 8 do
      begin
        chv:=chv+strtoint(ss[k])*round(power(2,8-k));
      end;
      smsbody:=smsbody+chr(chv);
      if length(t)=7 then
      begin
        ss:='0'+t;
        chv:=0;
        for k:=1 to 8 do
        begin
          chv:=chv+strtoint(ss[k])*round(power(2,8-k));
        end;
        t:='';
        smsbody:=smsbody+chr(chv);
      end;
    end;
    res[4]:=smsbody;
  end;
  result:=res;
end;

end.
0
 

Author Comment

by:LazyJeff
ID: 6442050
Functions are fine, but they cannot decode 160 long messages ! Short messages work just fine, but end of longer massages is messed up..

Any ideas what could cause this ? And what if senders phone number is different lenght ?

- Lj -
0
 
LVL 4

Expert Comment

by:jeurk
ID: 6443867
honnestly I don't know...
You might want to write to the author of the functions ?
0
 

Author Comment

by:LazyJeff
ID: 6444055
I'm doing some research with my friend.. I will email the author about these features. If we find the problem i let u know.. The points are reserved to you Jeurk anyway.. so when we solve this problem i send the points..

This is very intresting problem and i'm going to solve it !

Those routines helped A LOT !

- Lj -
0
 
LVL 17

Expert Comment

by:geobul
ID: 9289344
No comment has been added lately, so it's time to clean up this TA.
I will leave a recommendation in the Cleanup topic area that this question is:

accept jeurk's comment as answer

Please leave any comments here within the next seven days.

PLEASE DO NOT ACCEPT THIS COMMENT AS AN ANSWER!

Thanks,

geobul
EE Cleanup Volunteer
0

Featured Post

Active Directory Webinar

We all know we need to protect and secure our privileges, but where to start? Join Experts Exchange and ManageEngine on Tuesday, April 11, 2017 10:00 AM PDT to learn how to track and secure privileged users in Active Directory.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

The uses clause is one of those things that just tends to grow and grow. Most of the time this is in the main form, as it's from this form that all others are called. If you have a big application (including many forms), the uses clause in the in…
Objective: - This article will help user in how to convert their numeric value become words. How to use 1. You can copy this code in your Unit as function 2. than you can perform your function by type this code The Code   (CODE) The Im…
This video shows how to quickly and easily add an email signature for all users on Exchange 2016. The resulting signature is applied on a server level by Exchange Online. The email signature template has been downloaded from: www.mail-signatures…
Nobody understands Phishing better than an anti-spam company. That’s why we are providing Phishing Awareness Training to our customers. According to a report by Verizon, only 3% of targeted users report malicious emails to management. With compan…

828 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question