CODEWITHSUNDEEP
at-command3gmodem3g-networkdial-up
Mircea Iftimie
Mircea Iftimie

Reputation: 73

Data Call with AT commands failed

I'm using at commands to connect with a 3g modem to internet. All messages show that all is OK but there no internet acces and modem status in windows 7 is disconected. The led from the modem in on like it is connected to internet. The commands that i`m using are(in this order):

COM5 115200 4000

CODE INTRODUCED: AT+CGREG? +CGREG: 0,1 OK

CODE INTRODUCED: AT+CGREG=? +CGREG: (0-2) OK

CODE INTRODUCED: AT+CGREG? +CGREG: 0,1 OK

CODE INTRODUCED: AT+COPS? +COPS: 0,2,"22603",0 OK

CODE INTRODUCED: AT+CSQ +CSQ: 21,99 OK

CODE INTRODUCED: AT+CGATT=1 OK

CODE INTRODUCED: AT+CGDCONT=1,"IP","broadband" OK

CODE INTRODUCED: AT+CGACT=1,1 OK

CODE INTRODUCED: AT+CEER +CEER: No cause information available OK

CODE INTRODUCED: AT+CGACT? +CGACT: 1,1 OK

CODE INTRODUCED: AT+CGATT? +CGATT: 1 OK

CODE INTRODUCED: AT+CGREG? +CGREG: 0,1 OK

CODE INTRODUCED: AT+CGDCONT? +CGDCONT: 1,"IP","broadband","0.0.0.0",0,0 OK

CODE INTRODUCED: AT+CGACT=0,1 OK

CODE INTRODUCED: AT+CEER +CEER: No cause information available OK

CODE INTRODUCED: AT+COPS? +COPS: 0,2,"22603",0 OK

CODE INTRODUCED: AT+CSQ +CSQ: 21,99 OK

CODE INTRODUCED: AT+CGATT=1 OK

CODE INTRODUCED: AT+CGDCONT=1,"IP","broadband" OK

CODE INTRODUCED: AT+CGACT=1,1 OK

CODE INTRODUCED: AT+CEER +CEER: No cause information available OK

CODE INTRODUCED: AT+CGACT? +CGACT: 1,1 OK

CODE INTRODUCED: AT+CGATT? +CGATT: 1 OK

CODE INTRODUCED: AT+CGREG? +CGREG: 0,1 OK

CODE INTRODUCED: AT+CGDCONT? +CGDCONT: 1,"IP","broadband","0.0.0.0",0,0 OK

CODE INTRODUCED: AT+CGACT=0,1 OK

CODE INTRODUCED: AT+CEER +CEER: No cause information available OK

What am I missing?

Upvotes: 1

Views: 1192

Answers (2)

Mircea Iftimie
Mircea Iftimie

Reputation: 73

I`ve found the answer to my question. To connect to internet through a 3g modem you need to create a dial-up sesion or to use one existing. The easiest way in visual C# is to use DotRas library and create de dial-up. Example

private void connectbtn_Click(object sender, EventArgs e)

{
            string path = RasPhoneBook.GetPhoneBookPath(RasPhoneBookType.User);
            RasPhoneBook pbk = new RasPhoneBook();
            pbk.Open(path);
            RasDevice modem = RasDevice.GetDeviceByName("HUAWEI Mobile Connect - 3G Modem",RasDeviceType.Modem);
           //get the exact device name from windows
            RasEntry entry = RasEntry.CreateDialUpEntry("Broadband", "*99#", modem);
            entry.Options.RemoteDefaultGateway = true;
            if (RasEntry.Exists("Broadband", path) == false)
            { pbk.Entries.Add(entry); }
            RasDialer dialer = new RasDialer();
            dialer.EntryName = "Broadband";
            dialer.PhoneBookPath = path;
            dialer.Credentials = new NetworkCredential();

            dialer.Credentials.Domain = "broadband";
            dialer.PhoneNumber="*99#";
            dialer.Dial();

        }

Take care the setting you have for your connection to work and ghet internet acces.

Upvotes: 1

AlexS
AlexS

Reputation: 5345

Probably establishing the connection on the device won't be sufficient as windows will not be notified of the connection. You should setup a modem in Windows and use this to establish the connection.

DotRas ist a project to do exactly this in c#. But there may be other solutions for other languages as well. If you are scripting you can have a look at WMI. There are classes for modems as well.

Upvotes: 1

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