PPP reconnection afrter a closing

Rabbit
1

Hi all,
i’m using a LP3500 with a GPRS Modem
For the setting of the modem and it’s cheking i use a buffering system home-maded.

If i use a cabled modem all works fine.

But when with GPRS Modem i close the PPP on GPRS link all works but after i restart no connection is maded. and i not have any error feed-back.

Anybody has an idea? How to reset communication buffers on PPPlibrary?
Now i’m working with a routine that poer-dow the GPRS Terminal to ensure to not have any problem with that side, after reboot i wait the modem registration succeded but communication problems with modem persist.

Tnx
Marco

2

PPP: sending LCP config req i/f 0
PPP: got packet 3723 on i/f:0 protocol:0xc021
PPP: LCP NAK on i/f 0
PPP: sending LCP config req i/f 0
PPP: got packet 3723 on i/f:0 protocol:0xc021
PPP: received LCP ACK i/f 0. local_acked = 1
PPP: got packet 3723 on i/f:0 protocol:0xc021
PPP: LCP config request i/f 0
PPP: accepting option 2
PPP: accepting option 7
PPP: accepting option 8
PPP: accepting option 5
PPP: NAKing option 3
PPP: sending LCP nak i/f 0
PPP: got packet 3723 on i/f:0 protocol:0xc021
PPP: LCP config request i/f 0
PPP: accepting option 2
PPP: accepting option 7
PPP: accepting option 8
PPP: accepting option 5
PPP: accepting option 3
PPP: sending LCP ack i/f 0
PPP: sending our credentials a/b
PPP: sending PAP auth i/f 0
PPP: got packet 3723 on i/f:0 protocol:0xc023
PPP: sending IPCP config i/f 0
PPP: got packet 3723 on i/f:0 protocol:0x8021
PPP: IPCP config request i/f 0
IPCP: peer wants IP addr C0A8FEFE
PPP: accepting option 3
PPP: sending IPCP ack i/f 0
PPP: got packet 3723 on i/f:0 protocol:0x8021
PPP: IPCP NAK on i/f 0
PPP: sending IPCP config i/f 0
PPP: got packet 3723 on i/f:0 protocol:0x8021
PPP: i/f 0 UP
AttivaPPP: Indirizzo IP: 217.201.201.126 in 11 s

THE DICONNECTION:
PPP: LCP terminating on i/f 0
PPP: sending LCP term i/f 0
PPP: got packet 3723 on i/f:0 protocol:0xc021
PPP: Got LCP term ACK, disconnecting
PPP: LCP terminated on i/f 0 (result=1)

3

PPP: sending LCP config req i/f 0
PPP: got packet 36EC on i/f:0 protocol:0xc021
PPP: received LCP ACK i/f 0. local_acked = 1
PPP: got packet 36EC on i/f:0 protocol:0xc021
PPP: LCP config request i/f 0
PPP: accepting option 2
PPP: accepting option 7
PPP: accepting option 8
PPP: accepting option 5
PPP: NAKing option 3
PPP: sending LCP nak i/f 0
PPP: got packet 36EC on i/f:0 protocol:0xc021
PPP: LCP config request i/f 0
PPP: accepting option 2
PPP: accepting option 7
PPP: accepting option 8
PPP: accepting option 5
PPP: accepting option 3
PPP: sending LCP ack i/f 0
PPP: sending our credentials a/b
PPP: sending PAP auth i/f 0
PPP: got packet 36EC on i/f:0 protocol:0xc023
PPP: sending IPCP config i/f 0
PPP: got packet 36EC on i/f:0 protocol:0xc021
PPP: sending LCP term ack i/f 0
PPP: link i/f 0 is down
PPP: sending LCP config req i/f 0
PPP: got packet 3723 on i/f:0 protocol:0xc021
PPP: received LCP ACK i/f 0. local_acked = 1
PPP: got packet 3723 on i/f:0 protocol:0xc021
PPP: LCP config request i/f 0
PPP: accepting option 2
PPP: accepting option 7
PPP: accepting option 8
PPP: accepting option 5
PPP: NAKing option 3
PPP: sending LCP nak i/f 0
PPP: got packet 3723 on i/f:0 protocol:0xc021
PPP: LCP config request i/f 0
PPP: accepting option 2
PPP: accepting option 7
PPP: accepting option 8
PPP: accepting option 5
PPP: accepting option 3
PPP: sending LCP ack i/f 0
PPP: sending our credentials a/b
PPP: sending PAP auth i/f 0
PPP: got packet 3723 on i/f:0 protocol:0xc023
PPP: sending IPCP config i/f 0
PPP: got packet 3723 on i/f:0 protocol:0xc021
PPP: sending LCP term ack i/f 0
PPP: link i/f 0 is down

4

WHEN THE SCRIPT AND PPP WORKS:
CHAT: sending ‘ATZ’
CHAT: expecting ‘ok’
CHAT: found it!
CHAT: sending ‘AT+CGDCONT=1,“IP”,“ibox.tim.it”,0,0’
CHAT: expecting ‘ok’
CHAT: found it!
CHAT: sending ‘ATD99**1#’
CHAT: expecting ‘CONNECT’
CHAT: found it!
CHAT: not sending anything
CHAT: expecting ‘~’
CHAT: found it!
CHAT: end of script
AttivaPPP: Indirizzo IP: 217.202.9.18 in 11 s

WHEN DOES’NT:
CHAT: sending ‘ATZ’
CHAT: expecting ‘ok’
CHAT: found it!
CHAT: sending ‘AT+CGDCONT=1,“IP”,“ibox.tim.it”,0,0’
CHAT: expecting ‘ok’
CHAT: found it!
CHAT: sending ‘ATD991#’
CHAT: expecting ‘CONNECT’
CHAT: found it!
CHAT: not sending anything
CHAT: expecting ‘~’
CHAT: found it!
CHAT: end of script
CHAT: sending ‘ATZ’
CHAT: expecting ‘ok’
CHAT: found it!
CHAT: sending ‘AT+CGDCONT=1,“IP”,“ibox.tim.it”,0,0’
CHAT: expecting ‘ok’
CHAT: found it!
CHAT: sending 'ATD991#’
CHAT: expecting ‘CONNECT’
CHAT: timed out
CHAT: sending ‘ATH0’
CHAT: expecting ‘ok’
CHAT: found it!
CHAT: end of script
CHAT: sending ‘ATZ’
CHAT: expecting ‘ok’
CHAT: found it!
CHAT: sending ‘AT+CGDCONT=1,“IP”,“ibox.tim.it”,0,0’
CHAT: expecting ‘ok’
CHAT: found it!
CHAT: sending 'ATD99**1#’
CHAT: expecting ‘CONNECT’
CHAT: found it!
CHAT: not sending anything
CHAT: expecting ‘~’
CHAT: found it!
CHAT: end of script
AttivaPPP: errore di connessione

wHE CAN FIND THE CHAT END BUT DOES’NT STARTS THE LCP AND IP HANDSHAKE.

I use these commands:
for(count = 0; count < 3; count++)
{
#ifdef CONNMSG
printf( "AttivaPPP: tentativo n. %d
", count+1);
#endif
//configure PPP for dialing in to ISP and bring it up
ifconfig(IF_DEFAULT, IFS_PPP_INIT, IFS_END);
ifconfig(IF_DEFAULT,
IFS_PPP_SPEED, VELMODEM,
IFS_PPP_USEMODEM, 1,
IFS_PPP_RTSPIN, PBDR, NULL, 7, // Note: the NULL is for the shadow register. From DC9.0,
// this is computed automatically - the value passed here
// for the shadow register is ignored.
IFS_PPP_CTSPIN, PBDR, 0,
IFS_PPP_FLOWCONTROL, 0,
IFS_PPP_SENDEXPECT, DIALUP_SENDEXPECT,
#ifdef GPRSEN
IFS_PPP_HANGUP, “ATH0 #ok”,
#else
IFS_PPP_HANGUP, “ATH #ok”,
#endif
IFS_PPP_MODEMESCAPE, 1,
IFS_PPP_ACCEPTIP, 1,
IFS_PPP_ACCEPTDNS, 1,
IFS_PPP_REMOTEAUTH, DIALUP_NAME, DIALUP_PASSWORD,
IFS_UP,
IFS_END);

while(ifpending(IF_DEFAULT) & 1) {
tcp_tick(NULL);
}
if (ifstatus(IF_DEFAULT)) break;
}

5

First and working connection ( i can reconnect without turning off/on) the gprs modem only resetting the board with the command in dc5.92)

PPPLINK: baud rate 19200: setting divisor to 11
PPPLINK: bringing up serial PPP interface 0
PPPLINK: baud rate 19200: setting divisor to 11
PPPLINK: Opened PPP serial on iface 0 at 19200 baud
PPPLINK: starting modem escape sequence
PPPLINK: sendpacket totlen=1 i/f 0
PPPLINK: sendpacket totlen=1 i/f 0
PPPLINK: sendpacket totlen=1 i/f 0
PPPLINK: sendpacket totlen=5 i/f 0
PPPLINK: sendpacket totlen=38 i/f 0
PPPLINK: sendpacket totlen=13 i/f 0
PPPLINK: sendpacket totlen=24 i/f 0
PPPLINK: sendpacket totlen=24 i/f 0
PPPLINK: sendpacket totlen=13 i/f 0
PPPLINK: sendpacket totlen=28 i/f 0
PPPLINK: sendpacket totlen=12 i/f 0
PPPLINK: sendpacket totlen=26 i/f 0
PPPLINK: sendpacket totlen=14 i/f 0
PPPLINK: sendpacket totlen=26 i/f 0
AttivaPPP: Indirizzo IP: 217.201.67.76 in 10 s

SECOND AND ABOVE NOT WORKING CONNECTIONS:

PPPLINK: baud rate 19200: setting divisor to 11
PPPLINK: bringing up serial PPP interface 0
PPPLINK: baud rate 19200: setting divisor to 11
PPPLINK: Opened PPP serial on iface 0 at 19200 baud
PPPLINK: starting modem escape sequence
PPPLINK: sendpacket totlen=1 i/f 0
PPPLINK: sendpacket totlen=1 i/f 0
PPPLINK: sendpacket totlen=1 i/f 0
PPPLINK: sendpacket totlen=5 i/f 0
PPPLINK: sendpacket totlen=38 i/f 0
PPPLINK: sendpacket totlen=13 i/f 0
PPPLINK: sendpacket totlen=24 i/f 0
PPPLINK: sendpacket totlen=13 i/f 0
PPPLINK: sendpacket totlen=28 i/f 0
PPPLINK: sendpacket totlen=12 i/f 0
PPPLINK: sendpacket totlen=26 i/f 0
PPPLINK: sendpacket totlen=8 i/f 0
PPPLINK: baud rate 19200: setting divisor to 11
PPPLINK: bringing up serial PPP interface 0
PPPLINK: baud rate 19200: setting divisor to 11
PPPLINK: Opened PPP serial on iface 0 at 19200 baud
PPPLINK: starting modem escape sequence
PPPLINK: sendpacket totlen=1 i/f 0
PPPLINK: sendpacket totlen=1 i/f 0
PPPLINK: sendpacket totlen=1 i/f 0
PPPLINK: sendpacket totlen=5 i/f 0
PPPLINK: sendpacket totlen=38 i/f 0
PPPLINK: sendpacket totlen=13 i/f 0
PPPLINK: starting modem escape sequence
PPPLINK: sendpacket totlen=1 i/f 0
PPPLINK: sendpacket totlen=1 i/f 0
PPPLINK: sendpacket totlen=1 i/f 0
PPPLINK: sendpacket totlen=6 i/f 0
PPPLINK: Closed PPP serial on iface 0
PPPLINK: baud rate 19200: setting divisor to 11
PPPLINK: bringing up serial PPP interface 0
PPPLINK: baud rate 19200: setting divisor to 11
PPPLINK: Opened PPP serial on iface 0 at 19200 baud
PPPLINK: starting modem escape sequence
PPPLINK: sendpacket totlen=1 i/f 0
PPPLINK: sendpacket totlen=1 i/f 0
PPPLINK: sendpacket totlen=1 i/f 0
PPPLINK: sendpacket totlen=5 i/f 0
PPPLINK: sendpacket totlen=38 i/f 0
PPPLINK: sendpacket totlen=13 i/f 0
PPPLINK: sendpacket totlen=24 i/f 0
PPPLINK: sendpacket totlen=13 i/f 0
PPPLINK: sendpacket totlen=28 i/f 0
PPPLINK: sendpacket totlen=12 i/f 0
PPPLINK: sendpacket totlen=26 i/f 0
PPPLINK: sendpacket totlen=8 i/f 0
AttivaPPP: errore di connessione

How i close the woring connection:
PPPLINK: sendpacket totlen=41 i/f 0
PPPLINK: sendpacket totlen=41 i/f 0
PPPLINK: sendpacket totlen=41 i/f 0
PPPLINK: sendpacket totlen=41 i/f 0
PPPLINK: sendpacket totlen=41 i/f 0
PPPLINK: sendpacket totlen=41 i/f 0
PPPLINK: sendpacket totlen=41 i/f 0
PPPLINK: bringing down serial PPP interface 0
PPPLINK: sendpacket totlen=8 i/f 0
PPPLINK: starting modem escape sequence
PPPLINK: sendpacket totlen=1 i/f 0
PPPLINK: sendpacket totlen=1 i/f 0
PPPLINK: sendpacket totlen=1 i/f 0
PPPLINK: sendpacket totlen=6 i/f 0
PPPLINK: Closed PPP serial on iface 0

6

i’ve similar problem here. I’m using the RCM3360 to connect to Simens GPRS Modem.

I used ifconfig(…IFS_UP…) and ifconfig(…IFS_DOWN…) to bring up and close the interface. First run everything works fine, but if i put the program into a loop, all the subsequence PPP connection will fail…

Guess i need to reset/init the PPP struct… anybody have any idea how to do this?

7

Hi, i think is necessary to reset PPP buffers or TCP/ip STACKS.

I posted a question to technical support to have more help.

What kind of provider you are using? I’m using Italian Telecom Italia Mobile

Tomorow i’ll try whit another Cellular line provider

Bye

8

i’m using Siemens MC35i Modem to connect to Malaysian ‘Celcom’ ISP.

I dont really think there was a problem with the cellular line provider, instead it is the PPP/TCPIP stack we were using…

When i first run the program, the PPP connection established. If i run again it still running fine. The problem happen when i tried to put the whole program in a loop. In this case, only the first run will the PPP be connected, the subsequence run will fail completely.

So i believe when the program start/restart, something init the PPP/TCPIP stack… Did you find anyting to re-init the stacks? I will be looking into this matter later. If not i will try to dig into the library to see what’s actually happen…

9

Below is the PPP conn verbose:

CHAT: sending ‘ATZ’
CHAT: expecting ‘OK’
CHAT: found it!
CHAT: sending ‘ATH’
CHAT: expecting ‘OK’
CHAT: found it!
CHAT: sending ‘AT+CGDCONT=1,IP,celcom.net.my’
CHAT: expecting ‘OK’
CHAT: found it!
CHAT: sending ‘ATD99**1#’
CHAT: expecting ‘CONNECT’
CHAT: found it!
CHAT: not sending anything
CHAT: expecting ‘~’
CHAT: found it!
CHAT: end of script
PPP: sending LCP config req i/f 0
PPP: got packet B3CA on i/f:0 protocol:0xc021
PPP: LCP NAK on i/f 0
PPP: sending LCP config req i/f 0
PPP: got packet B3CA on i/f:0 protocol:0xc021
PPP: received LCP ACK i/f 0. local_acked = 1
PPP: got packet B3CA on i/f:0 protocol:0xc021
PPP: LCP config request i/f 0
PPP: accepting option 2
PPP: accepting option 7
PPP: accepting option 8
PPP: accepting option 5
PPP: peer requesting authentication, but no credentials
PPP: rejecting option 3
PPP: sending LCP reject i/f 0
PPP: got packet B3CA on i/f:0 protocol:0xc021
PPP: LCP config request i/f 0
PPP: accepting option 2
PPP: accepting option 7
PPP: accepting option 8
PPP: accepting option 5
PPP: peer requesting authentication, but no credentials
PPP: rejecting option 3
PPP: sending LCP reject i/f 0
PPP: got packet B3CA on i/f:0 protocol:0xc021
PPP: LCP config request i/f 0
PPP: accepting option 2
PPP: accepting option 7
PPP: accepting option 8
PPP: accepting option 5
PPP: sending LCP ack i/f 0
PPP: sending IPCP config i/f 0
PPP: got packet B3CA on i/f:0 protocol:0x8021
PPP: IPCP config request i/f 0
IPCP: peer wants IP addr C0A8FEFE
PPP: accepting option 3
PPP: sending IPCP ack i/f 0
PPP: got packet B3CA on i/f:0 protocol:0x8021
PPP: IPCP NAK on i/f 0
PPP: sending IPCP config i/f 0
PPP: got packet B3CA on i/f:0 protocol:0x8021
PPP: i/f 0 UP
INFO PPP connection established. IP address = 10.131.117.156

// …other SMTP program within here…//

PPP: LCP terminating on i/f 0
PPP: sending LCP term i/f 0
PPP: sending LCP term i/f 0
PPP: sending LCP term i/f 0
PPP: sending LCP term i/f 0
PPP: sending LCP term i/f 0
PPP: sending LCP term i/f 0
PPP: sending LCP term i/f 0
PPP: LCP too many retries during shutdown i/f 0 // -----> problem not terminating properly
PPP: LCP terminated on i/f 0 (result=-20)
CHAT: sending ‘ATH’
CHAT: expecting ‘OK’
CHAT: found it!
CHAT: end of script

// ------------second & subsequence loops-----------//

CHAT: sending ‘ATZ’
CHAT: expecting ‘OK’
CHAT: found it!
CHAT: sending ‘ATH’
CHAT: expecting ‘OK’
CHAT: found it!
CHAT: sending ‘AT+CGDCONT=1,IP,celcom.net.my’
CHAT: expecting ‘OK’
CHAT: found it!
CHAT: sending ‘ATD99**1#’
CHAT: expecting ‘CONNECT’
CHAT: found it!
CHAT: not sending anything
CHAT: expecting ‘~’
CHAT: found it!
CHAT: end of script
PPP: sending LCP config req i/f 0
PPP: got packet B401 on i/f:0 protocol:0xc021
PPP: received LCP ACK i/f 0. local_acked = 1
PPP: got packet B401 on i/f:0 protocol:0xc021
PPP: LCP config request i/f 0
PPP: accepting option 2
PPP: accepting option 7
PPP: accepting option 8
PPP: accepting option 5
PPP: peer requesting authentication, but no credentials
PPP: rejecting option 3
PPP: sending LCP reject i/f 0
PPP: got packet B401 on i/f:0 protocol:0xc021
PPP: LCP config request i/f 0
PPP: accepting option 2
PPP: accepting option 7
PPP: accepting option 8
PPP: accepting option 5
PPP: peer requesting authentication, but no credentials
PPP: rejecting option 3
PPP: sending LCP reject i/f 0
PPP: got packet B401 on i/f:0 protocol:0xc021
PPP: LCP config request i/f 0
PPP: accepting option 2
PPP: accepting option 7
PPP: accepting option 8
PPP: accepting option 5
PPP: sending LCP ack i/f 0
PPP: sending IPCP config i/f 0
PPP: got packet B401 on i/f:0 protocol:0xc021
PPP: sending LCP term ack i/f 0
PPP: link i/f 0 is down
ERR PPP connection failed
GPRS Connection Failed

10

These is the working modem ( same procedures different hardware and ISP )

PPPLINK: bringing up serial PPP interface 0
PPPLINK: baud rate 19200: setting divisor to 11
PPPLINK: Opened PPP serial on iface 0 at 19200 baud
PPPLINK: starting modem escape sequence
PPPLINK: sendpacket totlen=1 i/f 0
PPPLINK: sendpacket totlen=1 i/f 0
PPPLINK: sendpacket totlen=1 i/f 0
PPPLINK: sendpacket totlen=5 i/f 0
PPPLINK: sendpacket totlen=9 i/f 0
PPP: sending LCP config req i/f 0
PPPLINK: sendpacket totlen=24 i/f 0
PPP: got packet 36D6 on i/f:0 protocol:0xc021
PPP: received LCP ACK i/f 0. local_acked = 1
PPP: sending LCP config req i/f 0
PPPLINK: sendpacket totlen=24 i/f 0
PPP: got packet 36D6 on i/f:0 protocol:0xc021
PPP: received LCP ACK i/f 0. local_acked = 1
PPP: got packet 36D6 on i/f:0 protocol:0xc021
PPP: LCP config request i/f 0
PPP: accepting option 2
PPP: accepting option 5
PPP: accepting option 7
PPP: accepting option 8
PPP: sending LCP ack i/f 0
PPPLINK: sendpacket totlen=24 i/f 0
PPP: sending IPCP config i/f 0
PPPLINK: sendpacket totlen=26 i/f 0
PPP: got packet 36D6 on i/f:0 protocol:0xc021
PPP: got packet 370D on i/f:0 protocol:0x8021
PPP: IPCP config request i/f 0
PPP: rejecting option 2
IPCP: peer wants IP addr 0A990101
PPP: sending IPCP reject i/f 0
PPPLINK: sendpacket totlen=14 i/f 0
PPP: got packet 370D on i/f:0 protocol:0x8021
PPP: IPCP NAK on i/f 0
PPP: sending IPCP config i/f 0
PPPLINK: sendpacket totlen=26 i/f 0
PPP: got packet 370D on i/f:0 protocol:0x8021
PPP: IPCP config request i/f 0
IPCP: peer wants IP addr 0A990101
PPP: accepting option 3
PPP: sending IPCP ack i/f 0
PPPLINK: sendpacket totlen=14 i/f 0
PPP: got packet 370D on i/f:0 protocol:0x8021
PPP: i/f 0 UP
AttivaPPP: Indirizzo IP: 10.171.49.125 in 16 s
richiedo invio stato sbas 18/11/2007 23:06:24
PPPLINK: sendpacket totlen=45 i/f 0
PPP: got packet 370D on i/f:0 protocol:0x21
PPPLINK: sendpacket totlen=41 i/f 0
PPPLINK: sendpacket totlen=70 i/f 0
BatteriaALM: 12.585107V
PPPLINK: sendpacket totlen=409 i/f 0
PPPLINK: sendpacket totlen=81 i/f 0
PPP: got packet 370D on i/f:0 protocol:0x21
richiedo invio stato sbas 18/11/2007 23:06:37
PPPLINK: sendpacket totlen=449 i/f 0
richiedo invio stato sbas 18/11/2007 23:06:49
PPPLINK: sendpacket totlen=41 i/f 0
PPP: got packet 370D on i/f:0 protocol:0xc021
PPP: got packet 370D on i/f:0 protocol:0x21
PPPLINK: sendpacket totlen=41 i/f 0
PPPLINK: bringing down serial PPP interface 0
PPP: LCP terminating on i/f 0
PPP: sending LCP term i/f 0
PPPLINK: sendpacket totlen=8 i/f 0
PPP: got packet 370D on i/f:0 protocol:0x21
PPPLINK: sendpacket totlen=41 i/f 0
PPP: sending LCP term i/f 0
PPPLINK: sendpacket totlen=8 i/f 0
PPP: got packet 370D on i/f:0 protocol:0xc021
PPP: Got LCP term ACK, disconnecting
PPP: LCP terminated on i/f 0 (result=1)
PPPLINK: starting modem escape sequence
PPPLINK: sendpacket totlen=1 i/f 0
PPPLINK: sendpacket totlen=1 i/f 0
PPPLINK: sendpacket totlen=1 i/f 0
PPPLINK: sendpacket totlen=5 i/f 0
PPPLINK: Closed PPP serial on iface 0

11

i’m using Siemens MC35i Modem to connect to Malaysian ‘Celcom’ ISP.
I dont really think there was a problem with the cellular line provider, instead it is the PPP/TCPIP stack we were using.

12

i still can’t find a way to solve my problem… i dont have any other modem to test with. So i still have to find a way to get around the PPP re-connection problem… below are the program trace for my PPP re-connection which failed:

CHAT: sending ‘ATZ’
CHAT: expecting ‘OK’
CHAT: found it!
CHAT: sending ‘ATH’
CHAT: expecting ‘OK’
CHAT: found it!
CHAT: sending ‘AT+CGDCONT=1,IP,celcom.net.my’
CHAT: expecting ‘OK’
CHAT: found it!
CHAT: sending ‘ATD99**1#’
CHAT: expecting ‘CONNECT’
CHAT: found it!
CHAT: not sending anything
CHAT: expecting ‘~’
CHAT: found it!
CHAT: end of script
PPP: sending LCP config req i/f 0
PPP: got packet B393 on i/f:0 protocol:0xc021
PPP: LCP NAK on i/f 0
PPP: sending LCP config req i/f 0
PPP: got packet B393 on i/f:0 protocol:0xc021
PPP: received LCP ACK i/f 0. local_acked = 1
PPP: got packet B393 on i/f:0 protocol:0xc021
PPP: LCP config request i/f 0
PPP: accepting option 2
PPP: accepting option 7
PPP: accepting option 8
PPP: accepting option 5
PPP: peer requesting authentication, but no credentials
PPP: rejecting option 3
PPP: sending LCP reject i/f 0
PPP: got packet B393 on i/f:0 protocol:0xc021
PPP: LCP config request i/f 0
PPP: accepting option 2
PPP: accepting option 7
PPP: accepting option 8
PPP: accepting option 5
PPP: peer requesting authentication, but no credentials
PPP: rejecting option 3
PPP: sending LCP reject i/f 0
PPP: got packet B393 on i/f:0 protocol:0xc021
PPP: LCP config request i/f 0
PPP: accepting option 2
PPP: accepting option 7
PPP: accepting option 8
PPP: accepting option 5
PPP: sending LCP ack i/f 0
PPP: sending IPCP config i/f 0
//-----------------here it successfully received the ICPC protocol (0x8021) packet-------------//
PPP: got packet B393 on i/f:0 protocol:0x8021
PPP: IPCP config request i/f 0
IPCP: peer wants IP addr C0A8FEFE
PPP: accepting option 3
PPP: sending IPCP ack i/f 0
PPP: got packet B393 on i/f:0 protocol:0x8021
PPP: IPCP NAK on i/f 0
PPP: sending IPCP config i/f 0
PPP: got packet B393 on i/f:0 protocol:0x8021
PPP: i/f 0 UP
INFO PPP connection established. IP address = 10.131.209.168
PPP: LCP terminating on i/f 0
PPP: sending LCP term i/f 0
PPP: got packet B393 on i/f:0 protocol:0xc021
PPP: Got LCP term ACK, disconnecting
PPP: LCP terminated on i/f 0 (result=1)
CHAT: sending ‘ATH’
CHAT: expecting ‘OK’
CHAT: found it!
CHAT: end of script
GPRS Interface disconnected

//----------------- 2nd & subsequence reconnection in a loop ---------//

CHAT: sending ‘ATZ’
CHAT: expecting ‘OK’
CHAT: found it!
CHAT: sending ‘ATH’
CHAT: expecting ‘OK’
CHAT: found it!
CHAT: sending ‘AT+CGDCONT=1,IP,celcom.net.my’
CHAT: expecting ‘OK’
CHAT: found it!
CHAT: sending ‘ATD99**1#’
CHAT: expecting ‘CONNECT’
CHAT: found it!
CHAT: not sending anything
CHAT: expecting ‘~’
CHAT: found it!
CHAT: end of script
PPP: sending LCP config req i/f 0
PPP: got packet B401 on i/f:0 protocol:0xc021
PPP: received LCP ACK i/f 0. local_acked = 1
PPP: got packet B401 on i/f:0 protocol:0xc021
PPP: LCP config request i/f 0
PPP: accepting option 2
PPP: accepting option 7
PPP: accepting option 8
PPP: accepting option 5
PPP: peer requesting authentication, but no credentials
PPP: rejecting option 3
PPP: sending LCP reject i/f 0
PPP: got packet B401 on i/f:0 protocol:0xc021
PPP: LCP config request i/f 0
PPP: accepting option 2
PPP: accepting option 7
PPP: accepting option 8
PPP: accepting option 5
PPP: peer requesting authentication, but no credentials
PPP: rejecting option 3
PPP: sending LCP reject i/f 0
PPP: got packet B401 on i/f:0 protocol:0xc021
PPP: LCP config request i/f 0
PPP: accepting option 2
PPP: accepting option 7
PPP: accepting option 8
PPP: accepting option 5
PPP: sending LCP ack i/f 0
PPP: sending IPCP config i/f 0
//---------------- but here it received the LCP protocol (0x8021) packet----------------------//
//---------------- instead of ICPC protocol packet -------------//
PPP: got packet B401 on i/f:0 protocol:0xc021
PPP: sending LCP term ack i/f 0
PPP: link i/f 0 is down
GPRS Connection Failed

13

anybody have any experience on this situation?
should i re-init the PPP stack or PPP interface before re-connecting it? I’d tried the ifconfig(… IFS_PPP_INIT…); but it didn’t solve my problem…

another problem i’m having is ifpending() will not give an updated status of the interface if i manually unplugged the physical cable from the modem. It would only reads the status from the stack which might be the previous status, unless i use the ifconfig(…IFS_DOWN…) to properly bring down the interface. But i want to take into consideration in case of modem failure, power loss, etc… So is there any other way of checking the status of the PPP link manually?

14

[QUOTE=jordan;1121]i’m using Siemens MC35i Modem to connect to Malaysian ‘Celcom’ ISP.
I dont really think there was a problem with the cellular line provider, instead it is the PPP/TCPIP stack we were using.[/quote]

friend, what are you talking about? Why were you quoting back the sentences i wrote earlier on? what is your point?

15

You’ve already solved the problem ?

I Have the same problem.

Thanks