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mrcube_ns
Joined: 10 Apr 2002
Posts: 416
Helped: 10
Location: Dark side of the Moon
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 13 Dec 2003 0:06 GPRS and PPP |
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I try to connect mcu to GPRS with MC35 (Siemens GSM terminal).
When I try it with my PC and hyper terminal, untill conection is established I use AT command, but after conection is establish PPP protocol starting.
Does someone can help me? Does someone has PPP code in C or something like that?
Thanks in advance.
Mr.Cube
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artem
Joined: 22 May 2003
Posts: 1638
Helped: 90
Location: Turan
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| 15 Dec 2003 10:04 |
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| There is book in ebooks section dedicated to PPP . For sure there are many free PPP implentations as well . Check sourceforge and FreeBSD or Linux projects .
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meshmesh
Joined: 09 Dec 2003
Posts: 29
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| 15 Dec 2003 13:21 Re: GPRS and PPP |
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Hi there,
I am welling to do the same thing but I can not establish the GPRS attach .. 
could you please help me with some guide .. ?
regards
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mrcube_ns
Joined: 10 Apr 2002
Posts: 416
Helped: 10
Location: Dark side of the Moon
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| 19 Dec 2003 15:20 Re: GPRS and PPP |
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MC35 SIEMENS
for connection to gprs you have to do this:
AT+CGDCONT=1,IP,156.090.123.076 (ENTER)
ATD*99#
After this connection is established, but PPP starting (that's problem).
If you have some problems I can sent you siemens manual for gprs connecting.
Mr.Cube
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artem
Joined: 22 May 2003
Posts: 1638
Helped: 90
Location: Turan
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| 19 Dec 2003 17:50 |
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If PPP has started that means your attach has already been done and PDCH has allocated to you on air interface .
For PPP implementation there are 2 ways :
- you have to write your own code
- or h(at)ck other's code
There are plenty of PPP implementation on Linux and FreeBSD . All of them have open source code . Why you do not like to use it ??? If there are other reasons preventing you from doing that - could you pleae be more detailed .
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meshmesh
Joined: 09 Dec 2003
Posts: 29
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| 21 Dec 2003 8:24 Re: GPRS and PPP |
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| mrcube_ns wrote: |
MC35 SIEMENS
for connection to gprs you have to do this:
AT+CGDCONT=1,IP,156.090.123.076 (ENTER)
ATD*99#
After this connection is established, but PPP starting (that's problem).
If you have some problems I can sent you siemens manual for gprs connecting.
Mr.Cube |
Yes sir, I need this manual ...
regards,
meshmesh ...
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meshmesh
Joined: 09 Dec 2003
Posts: 29
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| 21 Dec 2003 8:29 |
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| artem wrote: |
If PPP has started that means your attach has already been done and PDCH has allocated to you on air interface .
For PPP implementation there are 2 ways :
- you have to write your own code
- or h(at)ck other's code
There are plenty of PPP implementation on Linux and FreeBSD . All of them have open source code . Why you do not like to use it ??? If there are other reasons preventing you from doing that - could you pleae be more detailed . |
One a day, I succeeded to make a ppp connection but for normal GSM network ( not GPRS ) ... I used a ppp connection script on a Linux OS ( It was redhat 7.3 ) .. it was very simple on gsm .. i think that it will be harder with gprs .. i remember that there are a lot of parameters i couldn't understand for gprs connections ...
regards ...
meshmesh
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mrcube_ns
Joined: 10 Apr 2002
Posts: 416
Helped: 10
Location: Dark side of the Moon
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| 21 Dec 2003 22:05 Re: GPRS and PPP |
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artem wrote:
If PPP has started that means your attach has already been done and PDCH has allocated to you on air interface .
For PPP implementation there are 2 ways :
- you have to write your own code
- or h(at)ck other's code
There are plenty of PPP implementation on Linux and FreeBSD . All of them have open source code . Why you do not like to use it ??? If there are other reasons preventing you from doing that - could you pleae be more detailed .
Here is what I want to do.
I have to connect two distant device (from one hand PC and the other mcu). I need to transmit some commands (serial RS232 protokol) to mcu. GPRS (with 2 MC35 one for PC and other for mcu) is just channel to have serial comunication on both side of connection. So, PC and mcu will think that they are conected with wire link, but they are not.
Any ideas?
Tnx.
Mr.Cube
PS. What is PDCH?
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mrcube_ns
Joined: 10 Apr 2002
Posts: 416
Helped: 10
Location: Dark side of the Moon
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| 22 Dec 2003 8:45 Re: GPRS and PPP |
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Here are GPRS documents for MC35
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artem
Joined: 22 May 2003
Posts: 1638
Helped: 90
Location: Turan
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| 22 Dec 2003 12:36 |
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Acctually GPRS is just GSM and 3G feature . In your case access is provided by GSM . DIfference between 3G and GSM is just 3G has more bandwidth than GSM .
For you problem there are 2 choices :
- use circuit switched call to GSM located modem pool which is not the GPRS . You can have both Internet connection (if call to access server within GSM or outside to normal ISP)PPP will be needed , or 2 way connection between your PC and destination mobile - no need for PPP .
- use packet switched calls GPRS . As far as everyting is TCP/IP , you have to have both TCP/IP server and clients on your mcu and PC .
To make connection you will need Internet IP addresses which will be dynamically assigned to mobiles when they attached (dhcp alike )- how are you going to exchnage those IP addreses before onnection will be done ? From other side , due to security consideration your operator can block most of the TCP/IP ports at the fireewall connected GSN nodes to Internet, so any connection request towards mobile will be blocked there (our local operator does that ).If you can achieve to have fixed Internet IP addres on your PC - this problem will be fixed . Or there could be 3 tier system implementation wehre both PC and mobile module have to be connected to server with fixed IP address on internet and signalling will flow through this server . May be some workaround could be done like
after GPRS attach (if you PC and modile module)
have GSM Modem - IP address will be known and it could be exchanged via SMS .
Regarding PPP there is a book
http://www.elektroda.pl/eboard/searchtopic59236-ppp.html
Let me know if you have more questions .
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xczms
Joined: 20 Feb 2004
Posts: 31
Location: hangzhou, china
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| 28 May 2004 10:21 GPRS and PPP |
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| do someone have experience in GPRS internet access with MCU ARM7TDMI?
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hifni_g
Joined: 17 Dec 2003
Posts: 7
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| 31 May 2004 5:13 Re: GPRS and PPP |
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| Please.. does anyone can give me an explanations or any resources about differences between GPRS and WAP?
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klchan
Joined: 25 Sep 2002
Posts: 19
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| 09 Jul 2004 18:27 Re: GPRS and PPP |
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I have worked with Ubicom's IP2022 with SonyEricsson's GM47, for the GPRS application.
Please note that when working with GPRS, you need not to handle the PPP.
PPP is basically a protocol for login a system for charging only. But in GPRS world, you are already billed with your SIM card information, just as you make a call with your mobile.
For the configuration of the GPRS, you need to consult with your mobile operation for the setting, as there maybe different on this.
Once your system has been connected with GPRS, it is connected with internet world, you can send all IP packet directly. Simplify speaking, the MCU or system should looking as the connected GPRS module as a ethernet card.
Hope this can help.
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mrcube_ns
Joined: 10 Apr 2002
Posts: 416
Helped: 10
Location: Dark side of the Moon
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| 12 Jul 2004 7:21 Re: GPRS and PPP |
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klchan basicly youre right, but not completly.
First, when you try to connect there are PPP for establish connection (login - PAP or CHAP and other things), but when you establish connection you have IP packets.
I resolve problem, I pick up Enfora insted of MC35. Enfora have PPP/IP to serial converter so everythingworks OK.
10x on your answer.
Best regards,
Mr.Cube[/quote]
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mitesh
Joined: 13 May 2002
Posts: 288
Helped: 6
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| 12 Jul 2004 17:59 Re: GPRS and PPP |
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HI,
Please any body help me for connecting CDMA terminal to internet by dailing it with PPP mode
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mrcube_ns
Joined: 10 Apr 2002
Posts: 416
Helped: 10
Location: Dark side of the Moon
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| 13 Jul 2004 7:19 Re: GPRS and PPP |
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| What is CDMA terminal?
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mitesh
Joined: 13 May 2002
Posts: 288
Helped: 6
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| 13 Jul 2004 16:55 Re: GPRS and PPP |
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Hi ,
CDMA Terminal is nothing but Fixed wireless Terminal. Which has CDMA module.
Can any body support me for connecting Modem to Microcontroller.
I want source code for communicating and installising modem drivers in microcontrller and dailling ISP provider (#777).
Please help me for it
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patacom
Joined: 22 Jul 2004
Posts: 3
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| 22 Jul 2004 23:24 Re: GPRS and PPP |
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| I worked whit AnyData iPort, you must set pwd an usr info and don't dial #777 just 111 (any 3 numbers but don't start whit 777)
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xczms
Joined: 20 Feb 2004
Posts: 31
Location: hangzhou, china
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| 03 Aug 2004 10:24 Re: GPRS and PPP |
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i try to connect MC35i to GPRS , i login as root in linuxOS,then excute the following command in shell:
# pppd /dev/ttyS0 debug 9600 connect 'chat -v -f /home/chat1'&
# cat /var/log/message
Aug 3 16:36:04 localhost pppd[3069]: pppd 2.4.1 started by root, uid 0
Aug 3 16:36:05 localhost chat[3070]: abort on (ERROR)
Aug 3 16:36:05 localhost chat[3070]: send (AT^M)
Aug 3 16:36:05 localhost chat[3070]: timeout set to 50 seconds
Aug 3 16:36:05 localhost chat[3070]: expect (OK)
Aug 3 16:36:05 localhost chat[3070]: AT^M^M
Aug 3 16:36:05 localhost chat[3070]: OK
Aug 3 16:36:05 localhost chat[3070]: -- got it
Aug 3 16:36:05 localhost chat[3070]: send (CONNECT^M)
Aug 3 16:36:05 localhost chat[3070]: send (ATD*99***1#^M)
Aug 3 16:36:06 localhost pppd[3069]: Serial connection established.
Aug 3 16:36:06 localhost pppd[3069]: Hangup (SIGHUP)
Aug 3 16:36:06 localhost pppd[3069]: Couldn't get channel number: Input/output error
Aug 3 16:36:07 localhost pppd[3069]: Exit.
why? how to solve this problem? could someone give some tips? thanks
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Boardstiff
Joined: 25 Aug 2001
Posts: 34
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| 03 Aug 2004 12:08 Re: GPRS and PPP |
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looks as if your not setting the ppp id & password or the access point for your gprs service
for example for vodaphone uk
id "web";
password "web";
"AT+CGDCONT=1,\"IP\",\"pp.vodafone.co.uk\"\n"; // vodaphones Access Point Name
"ATD*99***1#\n";
which service provider are you using ?
you may find this link useful
https://rip.psg.com/~randy/gprs-ppp.html
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xczms
Joined: 20 Feb 2004
Posts: 31
Location: hangzhou, china
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| 03 Aug 2004 15:14 Re: GPRS and PPP |
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i use china mobile communication.
i have excute the AT command as follows in the minicom:
AT+CGDCONT=1,"IP","CMNET"
OK
ATD*99***1#
CONNECT
~ }#?}!}#} }9}"}&} }*} } }'}"}(}"}%}&}>_}#}%?}%骡~~ }#?}!}#} }9}"}&} }*} }
}'}"}(}"}%}&}>_}#}%?}%骡~~ }#?}!}#} }9}"}&} }*} } }'}"}(}"}%}&}>_}#}%?}%骡
~~ }#?}!}#} }9}"}&} }*} } }'}"}(}"}%}&}>_}#}%?}%骡~~ }#?}!}#} }9}"}&} }*} }
}'}"}(}"}%}&}>_}#}%?}%骡~~ }#?}!}#} }9}"}&} }*} } }'}"}(}"}%}&}>_}#}%?}%
骡~~ }#?}!}#} }9}"}&} }*} } }'}"}(}"}%}&}>_}#}%?}%骡~~ }#?}!}#} }9}"}&} }*}
} }'}"}(}"}%}&}>_}#}%?}%骡~~ }#?}!}#} }9}"}&} }*} } }'}"}(}"}%}&}>_}#}%?
}%骡~~ }#?}!}#} }9}"}&} }*} } }'}"}(}"}%}&}>_}#}%?}%骡~
NO CARRIER
NO CARRIER why?
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pisoiu
Joined: 31 Dec 2002
Posts: 889
Helped: 24
Location: Romania
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| 23 Aug 2004 8:58 Re: GPRS and PPP |
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| xczms wrote: |
i use china mobile communication.
i have excute the AT command as follows in the minicom:
AT+CGDCONT=1,"IP","CMNET"
OK
ATD*99***1#
CONNECT
~ }#?}!}#} }9}"}&} }*} } }'}"}(}"}%}&}>_}#}%?}%骡~~ }#?}!}#} }9}"}&} }*} }
}'}"}(}"}%}&}>_}#}%?}%骡~~ }#?}!}#} }9}"}&} }*} } }'}"}(}"}%}&}>_}#}%?}%骡
~~ }#?}!}#} }9}"}&} }*} } }'}"}(}"}%}&}>_}#}%?}%骡~~ }#?}!}#} }9}"}&} }*} }
}'}"}(}"}%}&}>_}#}%?}%骡~~ }#?}!}#} }9}"}&} }*} } }'}"}(}"}%}&}>_}#}%?}%
骡~~ }#?}!}#} }9}"}&} }*} } }'}"}(}"}%}&}>_}#}%?}%骡~~ }#?}!}#} }9}"}&} }*}
} }'}"}(}"}%}&}>_}#}%?}%骡~~ }#?}!}#} }9}"}&} }*} } }'}"}(}"}%}&}>_}#}%?
}%骡~~ }#?}!}#} }9}"}&} }*} } }'}"}(}"}%}&}>_}#}%?}%骡~
NO CARRIER
NO CARRIER why? |
This worm is the PPP initalisation sequence for LCP phase. If you do not respond to it within the PPP timeout constraints, the modem will detach and close the connection, this is why you have "NO CARRIER". You need to respond to it with proper LCP closing sequences, after that you need to perform authentication by one of several available protocols (PAP, CHAP, etc...), then IPCP phase to establish an IP transport layer, and only after this you can transfer TCP or UDP packets.
The TELIT GM862 GPRS modules have a custom subset of AT commands, called EASY GPRS, which allow to perform data transfer without taking care about PPP layer. You just have to setup GPRS with AT+CGDCONT, after this define the desired connection parameters (protocol type TCP or UDP, remote port, peer IP or peer name), and request socket opening. After this you transfer the data, and the module takes care about all network protocols without user intervention.
/pisoiu
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xczms
Joined: 20 Feb 2004
Posts: 31
Location: hangzhou, china
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| 24 Aug 2004 7:49 Re: GPRS and PPP |
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/home/chat1:
ABORT "BUSY"
ABORT "NO CARRIER"
ABORT "NO DIALTONE"
ABORT "ERROR"
'' AT
OK AT+CGDCONT=1,"IP","CMNET"
OK ATD*99***1#
CONNECT ""
/etc/ppp/option:
lock
nocrtscts
noauth
local
defaultroute
i execute the following command in shell
#pppd /dev/ttyS0 9600 debug connect '/usr/sbin/chat -v -f /home/chat1'
^[[AAug 24 14:37:21 localhost pppd[3193]: pppd 2.4.1 started by root
, uid 0
Aug 24 14:37:22 localhost chat[3194]: abort on (BUSY)
Aug 24 14:37:22 localhost chat[3194]: abort on (NO CARRIER)
Aug 24 14:37:22 localhost chat[3194]: abort on (NO DIALTONE)
Aug 24 14:37:22 localhost chat[3194]: abort on (ERROR)
Aug 24 14:37:22 localhost chat[3194]: send (AT^M)
Aug 24 14:37:22 localhost chat[3194]: expect (OK)
Aug 24 14:37:22 localhost chat[3194]: AT^M^M
Aug 24 14:37:22 localhost chat[3194]: OK
Aug 24 14:37:22 localhost chat[3194]: -- got it
Aug 24 14:37:22 localhost chat[3194]: send (AT+CGDCONT=1,"IP","CMNET
"^M)
Aug 24 14:37:22 localhost chat[3194]: expect (OK)
Aug 24 14:37:22 localhost chat[3194]: ^M
Aug 24 14:37:22 localhost chat[3194]: AT+CGDCONT=1,"IP","CMNET"^M^M
Aug 24 14:37:22 localhost chat[3194]: OK
Aug 24 14:37:22 localhost chat[3194]: -- got it
Aug 24 14:37:22 localhost chat[3194]: send (ATD*99***1#^M)
Aug 24 14:37:23 localhost chat[3194]: expect (CONNECT)
Aug 24 14:37:23 localhost chat[3194]: ^M
Aug 24 14:37:23 localhost chat[3194]: ATD*99***1#^M^M
Aug 24 14:37:23 localhost chat[3194]: CONNECT
Aug 24 14:37:23 localhost chat[3194]: -- got it
Aug 24 14:37:23 localhost chat[3194]: send (^M)
Aug 24 14:37:23 localhost chat[3194]: expect (^M)
Aug 24 14:37:23 localhost chat[3194]: ^M
Aug 24 14:37:23 localhost chat[3194]: -- got it
Aug 24 14:37:23 localhost chat[3194]: send (^M^M)
Aug 24 14:37:23 localhost chat[3194]: expect (^M)
Aug 24 14:37:23 localhost chat[3194]:
Aug 24 14:37:26 localhost chat[3194]: ~^?}#@!}!}#} }9}"}&} }*} } }'}
"}(}"}%}&''7-}#}%B#}%}>A~~^?}#@!}!}#} }9}"}&} }*} }
Aug 24 14:37:29 localhost chat[3194]: }'}"}(}"}%}&''7-}#}%B#}%}>A~~^
?}#@!}!}#} }9}"}&} }*} } }'}"}(}"}%}&''7-}#}%B#}%}>
Aug 24 14:37:35 localhost chat[3194]: A~~^?}#@!}!}#} }9}"}&} }*} } }
'}"}(}"}%}&''7-}#}%B#}%}>A~~^?}#@!}!}#} }9}"}&} }*}
Aug 24 14:37:38 localhost chat[3194]: } }'}"}(}"}%}&''7-}#}%B#}%}>A~
~^?}#@!}!}#} }9}"}&} }*} } }'}"}(}"}%}&''7-}#}%B#}%
Aug 24 14:37:44 localhost chat[3194]: }>A~~^?}#@!}!}#} }9}"}&} }*} }
}'}"}(}"}%}&''7-}#}%B#}%}>A~~^?}#@!}!}#} }9}"}&} }*
Aug 24 14:37:47 localhost chat[3194]: } } }'}"}(}"}%}&''7-}#}%B#}%}>
A~~^?}#@!}!}#} }9}"}&} }*} } }'}"}(}"}%}&''7-}#}%B#
Aug 24 14:37:53 localhost chat[3194]: }%}>A~~^?}#@!}!}#} }9}"}&} }*}
} }'}"}(}"}%}&''7-}#}%B#}%}>A~^M
Aug 24 14:37:53 localhost chat[3194]: -- got it
Aug 24 14:37:53 localhost pppd[3193]: Serial connection established.
Aug 24 14:37:53 localhost pppd[3193]: using channel 1
Aug 24 14:37:53 localhost pppd[3193]: Using interface ppp0
Aug 24 14:37:53 localhost pppd[3193]: Connect: ppp0 <--> /dev/ttyS0
Aug 24 14:37:53 localhost /etc/hotplug/net.agent: assuming ppp0 is a
lready up
Aug 24 14:37:54 localhost pppd[3193]: sent [LCP ConfReq id=0x1 <asyn
cmap 0x0> <magic 0xdba7262e> <pcomp> <accomp>]
Aug 24 14:37:54 localhost pppd[3193]: Hangup (SIGHUP)
Aug 24 14:37:54 localhost pppd[3193]: Modem hangup
Aug 24 14:37:54 localhost pppd[3193]: Connection terminated.
Aug 24 14:37:54 localhost /etc/hotplug/net.agent: NET unregister eve
nt not supported
Aug 24 14:37:55 localhost pppd[3193]: Exit.
what the Hangup(SIGHUP) mean? which cause it? what should i do? thanks
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eduardorrodrigues
Joined: 16 Feb 2005
Posts: 1
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| 16 Feb 2005 18:25 GPRS and PPP |
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Hi friends. I usinge the siemens MC35i for one application that use one microcontroler, therefore I use serial comands. As I already saw other peaple that problems like me. Dont connect (NO CARRIER). Need send some specifc command?
This Is PPP?
How can I make that?
Where do I find as setting up strings PPP?
Help me please...
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kimo
Joined: 17 Apr 2005
Posts: 1
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| 17 Apr 2005 22:40 Re: GPRS and PPP |
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THIS IS VERY URGENT .... Please help me...
My service provider has set-up a special connection (A sort of VPN) where I dial through GPRS and establish a PPP link. He did this so that the IP address I have setup on the local machine can be kept once I connect to the server on the other end.
The Service provider tells me that the PDP context for this is set-up with the command :
at+cgdcont=1,"PPP","BAM"
where BAM is the name of the server on his side...
The problem is that I am using a Siemens MC35i Terminal and it doesn't accept this command....
The MC35i doesn't seem to accept "PPP" in the PDP context definition.. but it does accept "IP" when I try to connect to the Internet server of my provider !
Has anyone had to deal with an issue like this ?
This whole process actually works when using a GPRS mobile phone SL55 as a modem ! But I don't know what I am doing wrong !
THANKS very much
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Marlos88
Joined: 03 Feb 2006
Posts: 1
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| 03 Feb 2006 0:45 Re: GPRS and PPP |
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I had the same problem, when the PPP start I stop.
This topic is old, so i want to know if somebody did it, or can help me with that.
I want to use mcu with the MC35 for my college work, but i donīt know anything about PPP. Did somebody implemented it in a mcu? Or have some documentation?
Thanks
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techie
Joined: 05 Feb 2002
Posts: 834
Helped: 42
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| 05 Feb 2006 16:32 GPRS and PPP |
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| If you search this forum, you will find that much has been written on this topic. TO start with, there are 2 excellent application notes that implement PPP on a mcu. One is from microchip and the other from motorola.
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Unomano
Joined: 31 Aug 2005
Posts: 43
Location: Minsk, Belarus
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| 15 May 2006 10:44 GPRS and PPP |
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| Does anybody know how to terminate Voice call but not terminating active GPRS connection? Is there any difference between ATH (ATH0) and AT+CHUP comands?
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Linnea
Joined: 29 Jun 2006
Posts: 1
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| 21 Jul 2006 9:39 Re: GPRS and PPP |
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old thread but the same problem:
I try to connect internet with Siemens MC35i modem and WinXP. The connection starts but I can't change/use the PPP to send data. What can I do?
Btw, it's no problem to connect in general, but I need the modem with a data logger without every OS like Win or Linux. So, the logger only send the AT command to the modem and when connection is established the data have to send to a PHP script on a special server. (e.g.: GET /scripts/test.php?A=1&B=2)
How can I solve this?
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techie
Joined: 05 Feb 2002
Posts: 834
Helped: 42
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| 21 Jul 2006 13:03 GPRS and PPP |
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| To be connected to internet, you need TCP/IP stack. You can either use the TCP/IP stack of the OS like winsock of windows or you can write your own stack. Most modules also come with a stack built-in. But I dont think MC35 is one of those.
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