(!!!Important)"AT"+"GPRS"==>"Internet" Only... [EMC, njabin, BigRAT, ...]

Dear BigRat.
Maybe, I made it a little bit confusing. I re-explain:

Before automating everything with the microcontroller, I'm testing the connection with Hyperterminal.
So, I'm doing two disjoint experiences:
1- PC + Hyperterminal +RS232 direct cable+ Modem
2- uC + TCP/IP stack + Modem.

Both of these solutions didn't work.

NB: I'm not using any negotiation sequence, nor RAS, ...
Plz, Tell me, what should I do? & if it's necessary to negotiate the PPP connection? & how?

Hi zicon5 ,
     You use the HyperTerminal to send the AT commands, if the AT commands is right, the GSM/GPRS modem will return "CONNECT". If you use the PC to connect with the modem, after the "connect", you can get the "NO CARRIER" .
This is right, you dont worry about it. If you want to use your TCP/IP stack, you must create a PPP link. As for the PPP source code, you you want to get it , give me your email, I can send it to you.
     If you have any question, PLZ contact with me.
   BR/njabin

hi njabin :
            i  meet some question about the ppp ,too. do you help me?  my email: zjh0910@sina.com . thank you!

Hi Njabin.
10x, for ur response.
U said I must create the PPP link, HOW? isn't it the jov of the TCP/IP & PPP Protocol STack S7600.
I don't think that I should negotiate myself for the connection as describe in MC AN724, otherwise, what is the S7600 for?

Thanks in advance for any illustration.
My email is n5pascal@hotmail.com.

Hi zicon5 ,
     Yes, you does not create a PPP link by yoursekf, because the S7600 has supportted it. So when you complete the AT commands, you can set the S7600 active.
     You can refer the documents:
http://www.thomtronics.com/pdf/ch/ieasy2_data_ch.pdf
http://www.nist.gov/pc2001/PC%202001%20Speaker%20Slides.pdf/PC%20%202001%20Svetlana%20Avramov.pdf

       If you have any question ,PLZ contact with me.
       Best Regards,
njabin

Dear Njabin,
I'm Ok, with you, concerning the no need of implementing manual negotiation, cos this is the work of S7600.
But, the problem is :
The uC enters the loop & doesn't get out...
I see the semicolon on the LCD & nothing else (Not the colons)
Also, the same for the second loop, the uC loops in it...
 
I'm spying the serial Data coming & going thru the modem, everything is OK.
That means, the serial port of the Seiko is 100% working...
 
I'm using the GPRS compatible modem Enabler-G from Enfora.
This is a code Snippet:
 
 
 lcd_putc(';');

 // (Register 0x60) wait for PPP to be Up
 while(!(ReadSeiko(PPP_Control_Status)&0x01))
      delay_ms(5);
 
 lcd_putc(':');
 
 while(ReadSeiko(Our_IP_Address_L) == 0); // detect when ready to proceed
 
  delay_ms(500); //I added it.
 
 
So, what do u you think? What does forbid the PPP to be up? & forbid allocating of an IP @??????????
 
10x

Hi zicon5 ,
     I want to ask what kinds of authorization you adopt?
 Because you have not seen the colon, so the problem will happen on the function of the ReadSeiko(PPP_Control_Status). I think it is not authorized because the password or username is wrong.
    As for the IP, because the funcrion of the  ReadSeiko(Our_IP_Address_L) does not work, so you did not get the IP.
    BR/njabin

Hello Njabin,
Actually, My operator is Swisscom,
I memorized the Context, APN in the SIM.
The user name & password are gprs, & gprs...

The code snippet I use:

WriteSeiko(PPP_Control_Status,0x01);      // reset PPP
WriteSeiko(PPP_Control_Status,0x00);
WriteSeiko(PPP_Control_Status,0x20);      // set PAP mode
delay_ms(5);


      strcpy(user,"gprs");
      i=4;
      WriteSeiko(PAP_String,i);      // Write string length to PAP register

      // Write "Username" to PAP register in S-7600A
      for(j=0; j < i; j++)
            WriteSeiko(PAP_String,user[j]);


      //Determine length of "Password" and write it to the PAP register

      WriteSeiko(PAP_String,i);      // Write string length to PAP register

      // Write "Password" to PAP register in S-7600A
                strcpy(pass,"gprs");
      for(j=0; j < i; j++)
            WriteSeiko(PAP_String,pass[j]);

      WriteSeiko(PAP_String,0x00);// Write final NULL character to PAP register


    strcpy(tampon,"ATD*99#");
    S_Putchaine(tampon,7);
    S_Putc('\r');            // end with CR      

I see while sniffing the serial output of the modem, the commands flowing right, & the response is OK.
I even see the negotiation sequence, that is several times from 1st side, & then  several times from second side. (Because Echo is on.)
BUT THE RESULT IS NO CARRIER.

I even tried to connect thru GSM & not GPRS, the result was CONNECT & NOT NO CARRIER, but, Also, the IP is null...

If you have a solution, maybe using the GSM, say it plz...
10x for u response.

I didn't mention, all the code, but, of course before the Dial (ATD*99#), I only make activation of Context, with AT+CGACT=1,1...

All other AT commands were entered & saved (memorized into the SIM), like +CGATT=1, CGAATT=1, %CGPPP=3 or 1 (tried both), %CGPCO=1,"IP","gprs.swisscom.ch", +CBST=7,0,1, +COPS=0

Hi zicon5,
      Here you said "I even tried to connect thru GSM & not GPRS", I assertain that the ways to the GSM and GPRS are different.
If you adopt the GSM to dial out, you use the CSD methods, But the GPRS will be support the CSD and PSD, usually adopt PSD.From you give the code, you adopt the CSD method to the dial out. You should config the PDP, usually you should adopt: AT+CGCONT="cid","IP","APN",here the cid is the number for your GPRS modem,the APN will be provied by your SP. Then you will send the commands of the "ATD*99#".Then will start the PPP procedure,here you will set the username and password for the authorization method.
     From your said, I think the problem is the authorization did not pass, so the PPP is low. If you can capture the PPP packets, you would find the problem for the PPP low.
     If you can give me the information for the errors, I would help you to analyse them.
    BR/njabin

Hello Njabin.
10x 4 answer.
See a format version of the output in your email.

While sniffing the Output of the modem, after having all the commands, & the result is OK  I see on the screen:
 
#0ACONNECT (len=8)

#0A~}# !}!}!} }2}"}&} } } } }#}$#}'}"}(}" ~~}# !}"}!} }*}"}&} } } } 1}/~~}# !}"}"} }*}"}&} } } } 6~~ }#!}"}#} }*}"}&} } } }  ~~}# !}!}!} }2}"}&} } } } }#}$#}'}"}(}" ~~#03 ##02#04#00#05#00U~~ #03!#01#01#00#04#00~~#03!#03#05#00#0A#03#06#0Av#1E@~~ #03!#01#02#00#04dX~~#03!#02#06#00#0A#03#06#0Av#1E@r~~ #03!#01#02#00#04dX~~#03!#01#02#00#04dX~~ #03!#01#02#00#04dX~~#03!#01#02#00#04dX~~ #03!#01#02#00#04dX~~#03!#01#02#00#04dX~~ #03!#01#02#00#04dX~~#03!#01#02#00#04dX~~ #03!#01#02#00#04dX~~}# !}%}!} }%}#1~~}# !}%}!} }%}#1~ (len=394)

#0ANO CARRIER (len=11)

#0A

As you see:

It's LCP, & then PAP, & then IPCP, & Then LCP!!!!

or in Hexa

 
 
#0A#43#4F#4E#4E#45#43#54 (len=8)

#0A#7E#FF#7D#23#C0#21#7D#21#7D#21#7D#20#7D#32#7D#22#7D#26#7D#20#7D#20#7D#20#7D#20#7D#23#7D#24#C0#23#7D#27#7D#22#7D#28#7D#22#DD#94#7E#7E#FF#7D#23#C0#21#7D#22#7D#21#7D#20#7D#2A#7D#22#7D#26#7D#20#7D#20#7D#20#7D#20#31#7D#2F#7E#7E#FF#7D#23#C0#21#7D#22#7D#22#7D#20#7D#2A#7D#22#7D#26#7D#20#7D#20#7D#20#7D#20#36#D9#7E#7E#FF#7D#23#C0#21#7D#22#7D#23#7D#20#7D#2A#7D#22#7D#26#7D#20#7D#20#7D#20#7D#20#CB#94#7E#7E#FF#7D#23#C0#21#7D#21#7D#21#7D#20#7D#32#7D#22#7D#26#7D#20#7D#20#7D#20#7D#20#7D#23#7D#24#C0#23#7D#27#7D#22#7D#28#7D#22#DD#94#7E#7E#FF#03#C0#23#02#04#00#05#00#DC#55#7E#7E#FF#03#80#21#01#01#00#04#00#B7#7E#7E#FF#03#80#21#03#05#00#0A#03#06#0A#76#14#6F#17#AC#7E#7E#FF#03#80#21#01#02#00#04#64#58#7E#7E#FF#03#80#21#02#06#00#0A#03#06#0A#76#14#6F#37#56#7E#7E#FF#03#80#21#01#02#00#04#64#58#7E#7E#FF#03#80#21#01#02#00#04#64#58#7E#7E#FF#03#80#21#01#02#00#04#64#58#7E#7E#FF#03#80#21#01#02#00#04#64#58#7E#7E#FF#03#80#21#01#02#00#04#64#58#7E#7E#FF#03#80#21#01#02#00#04#64#58#7E#7E#FF#03#80#21#01#02#00#04#64#58#7E#7E#FF#03#80#21#01#02#00#04#64#58#7E#7E#FF#03#80#21#01#02#00#04#64#58#7E#7E#FF#7D#23#C0#21#7D#25#7D#21#7D#20#7D#25#7D#23#9A#31#7E#7E#FF#7D#23#C0#21#7D#25#7D#21#7D#20#7D#25#7D#23#9A#31#7E (len=394)

#0A#4E#4F#20#43#41#52#52#49#45#52 (len=11)

#0A

Hello,
 
Yes, I solved the problem, it was an error in the PAP_String, who was not getting the correct password.
Now, the uC trespass the 2 loops of PPP & IP.

<b>BUT</b>, the new problem, is the uC loops indefinitely inside the loop waiting for socket establishment.
for(temp=0;temp<3;temp++)
      {
            WriteSeiko(Socket_Index,0x00);      // Use Socket 0
            
            
            WriteSeiko(Socket_Status_H,0x00);             //Ensure that Snd_Busy bit is not busy
            
            
            WriteSeiko(Socket_Config_Status_L,0x10);// Reset socket
            delay_ms(5);
            WriteSeiko(Our_Port_L,PORT_L);// Write the port address
      WriteSeiko(Their_Port_L,PORT_L);      // for both the server
            WriteSeiko(Our_Port_H,PORT_H);// and the client
            WriteSeiko(Their_Port_H,PORT_H);

      WriteSeiko(Socket_Config_Status_L,0x02);// Use TCP client mode
            
            WriteSeiko(Socket_Activate,0x01);// Activate socket

                                 lcd_putc('.');            
                        
            // Loop to wait for socket to be connected with the server
            while(1)
            {
                  delay_ms(5);
                   
                   j = ReadSeiko(Socket_Status_M);

                  if(j&0x10)
                  {
                        i = 0;
                        break;
                  }
//                  else if(j&0xe0)
//                        break;
            }
      }
      CONNECTED = 1;
lcd_putc('U');



I see the point ONE TIME, but not the U.
What do you think, forbidding from getting the socket.
<u>I'm using the IP @of google as server: 216.239.33.100 & 80 as port number</u>

Hi zicon5,
    I think you should better to get the web site from the DNS firstly.
    How do you get the IP(216.239.33.100 )? For the DNS server, the web site usually is dynamic IP-address.

   " j = ReadSeiko(Socket_Status_M);"
    Here , what does stand for the return value ?

    BR/njabin

Hi Njabin,
Actually, I used ping google.com in order to translate that domain name to an IP address, using the internet DNS.
I use to verifiy:
in my web browser: http://216.239.33.100:80
80 is the port number.

Maybe, there's some security on that server, that's why it's not responding...
Do you a permanent IP address, that's fix, without security...??????????

The j is the Socket_Status_M which should be 0x10 that means the bit four is 1 ==> the socket establishes a
connection to a host machine....
I wait until the establishment of the connection.

HI NJABIN

I have the following same problem. Please send me PPP source code, my mail id rammuru@hotmail.com, million thanks in advance

"Hi zicon5 ,
     You use the HyperTerminal to send the AT commands, if the AT commands is right, the GSM/GPRS modem will return "CONNECT". If you use the PC to connect with the modem, after the "connect", you can get the "NO CARRIER" .
This is right, you dont worry about it. If you want to use your TCP/IP stack, you must create a PPP link. As for the PPP source code, you you want to get it , give me your email, I can send it to you.
     If you have any question, PLZ contact with me.
   BR/njabin "