How to retrieve response result in sending USSD commands in c#?

Question

1.00/5 (1 vote)

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I sent USSD command using this code:

C#

SerialPort port = new SerialPort();

port.BaudRate = 921600;
port.PortName = "COM16";
port.Parity = Parity.None;
port.DataBits = 8;
port.StopBits = StopBits.One;
port.ReadTimeout = 3000;
port.WriteTimeout = 3000;
port.DataReceived += port_DataReceived;

port.Open();

port.Write("AT+CUSD=1,\"*140*1#\"" + "\r\n");

void port_DataReceived(object sender, SerialDataReceivedEventArgs e)
{
        SerialPort spL = (SerialPort)sender;
        byte[] buf = new byte[spL.BytesToRead];
        spL.Read(buf, 0, buf.Length);

        foreach (Byte b in buf)
        {
            message += b.ToString();
        }

        var result = Encoding.ASCII.GetString(buf);//just return OK
    }

Why just retrieve OK in result?

in this case i want to retrieve my balance and i must receive answer like this: "your balance is 100$..." but just retrieve: "AT+CUSD=1,\"*140*1#\"\r\n\OK\r\n" but when i send this command by modem's own application retrieve correct response from operator this means my sending command is OK but that application receive all answer but i receive half.

Posted 29-Aug-13 23:00pm

davidstein

Updated 30-Aug-13 1:12am

v3

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Comments

Nelek 30-Aug-13 5:14am

Not really clear, would you mind to use "improve question" to explain your problem better?

davidstein 30-Aug-13 7:01am

in this case i want to retrieve my balance and i must receive answer like this: "your balance is 100$..." but just retrieve:
"AT+CUSD=1,\"*140*1#\"\r\n\OK\r\n" but when i send this command by modem's own application retrieve correct response from operator this means my sending command is OK but that application receive all answer but i receive half.

[no name] 30-Aug-13 5:29am

Probably because the command was successful.

Andy411 30-Aug-13 6:19am

What kind of answer do you excpect?

davidstein 30-Aug-13 7:06am

"your balance is 100$..."

Andy411 30-Aug-13 7:36am

I just found this http://de.scribd.com/doc/63648056/136/AT-CUSD-Unstructured-supplementary-service-data
Did you play around with differnet AT cmds directly from a terminal program to se the answers from the modem?

davidstein 30-Aug-13 8:56am

Thanks for your help.i test it by hyper terminal and send that command and receive OK and nothing else what is this means?

Richard MacCutchan 30-Aug-13 6:40am

Please do not repost the same question in multiple forums.

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mdrizwan_1 · Answer 1 · 2013-09-17T23:18:00

Solution 1

Hello David,

Add ,15 at the end

eg: "AT+CUSD=1,\"*140*1#\"" + ",15\r\n"

Hope u find this answer helpful

Regards

Posted 17-Sep-13 23:18pm

mdrizwan_1

Comments

Hasan Habib Surzo 28-May-15 6:24am

I try this but not get any result. could you please share some real working example. i try many developers c# and vb.net code using google but none of them work properly.

mdrizwan_1 13-Jul-15 7:43am

Hello Hasan,

Can you please provide sample code or brief requirements, so that i can help if i can.

Regards

Member 10213491 · Answer 2 · 2016-01-20T22:44:00

this might help you
vb USSD code sending
or
u can copy URL http://www.experts-exchange.com/questions/23017550/AT-COMMAND-GSM-Modem-using-USSD-Vbscript.html

<br />
vance<br />
Sub USSD()<br />
Set MSComm1=CreateObject("MSCOMMLib.MSComm")<br />
MSComm1.Settings = "9600,n<br />
MSComm1.InputLen = 0<br />
MSComm1.RThreshold = 5<br />
MSComm1.CommPort = 4<br />
MSComm1.InBufferCount = 0<br />
MSComm1.PortOpen = True<br />
MSComm1.Output="AT+CMGF=1"<br />
WScript.Sleep(1000) TextCommand = "*124#" strCommand = "AT+CUSD=1," & Chr(34) & TextCommand & Chr(34) & ",15"     MSComm1.Output=strCommand     WScript.Sleep(10000)     strResponse=MSComm1.Input     If (InStr(strResponse, "OK") > 0) Then ' Re MSComm1.Output=" "<br />
WScript.Sleep(10000)<br />
strResponse2=MSComm1.Input<br />
If (InStr(strResponse2, "+CUSD:") > 0) Then          ' If USSD response             strFields = Split(strResponse2, Chr(34))             modemReply = strFields(<br />
Else<br />
    modemReply = "Error st End If ELSE <br />
modemReply = "Error st<br />
End if <br />
MSComm1.PortOpen = False <br />
set MSComm1=nothing<br />
 End Sub <br />
Call USSD() <br />
msgbox modemReply<br />

there are some mistakes but u can fix them, i just sent that thru a phone en phone dnt hold that much copied data in the clipboard with tabs en returns