Hi guys,

I am working on a project where i have to send and receive sms messages using a GSM modem. Currently i am using my Samsung SGH-E250 phone as a GSM modem. I can successfully send messages and receives new messages. The problem is when i give the AT commands to get messages from phone or SIM's storage it gives weird output which i can not guess what it is. Below is the piece of code which is used to get messages:

string Resp = "";

MessagePort.WriteLine("AT+CMGF=1" + "\r"); /* message format = Text */
Resp = ReadPortEx();

MessagePort.WriteLine("AT+CMEE=1" + "\r"); /* set extended error reports. */
Resp = ReadPortEx();

MessagePort.WriteLine("AT+CPMS=?" + "\r"); /* Give preferred message storage. */
Resp = ReadPortEx();

MessagePort.WriteLine("AT+CPMS=\"ME\"" + "\r"); /* Read messages from phone/modem's storage. */
Resp = ReadPortEx();

//MessagePort.WriteLine("AT+CPMS=\"SM\"" + "\r"); /* Read messages from SIM's storage. */
//Resp = ReadPortEx();

//MessagePort.WriteLine("AT+CMGL=\"ALL\"" + "\r"); /* Get list of all messages. */

MessagePort.WriteLine("AT+CMGL=\"REC UNREAD\"" + "\r"); /* Get list of unread messages. */
Resp = ReadPortEx();

and the output it gives is a very large stream of characters like this:


"\r\n+CMGL: 0,\"REC READ\",\" eL\",\"|\",\"
\",80,0\r\n,0\r\n\r\n+CMGL: 0,\"REC READ\",\" eL\",\"|\",\"
\",80,0\r\n,0\r\n\r\n+CMGL: 0,\"REC READ\",\"

eL\",\"|\",\"
\",80,0\r\n,0\r\n\r\n+CMGL: 0,\"REC READ\",\" eL\",\"|\",\"
\",80,0\r\n,0\r\n\r\n+CMGL: 0,\"REC READ\",\"

eL\",\"|\",\"
\",80,0\r\n,0\r\n\r\n+CMGL: 0,\"REC READ\",\" eL\",\"|\",\"
\",80,0\r\n,0\r\n\r\n+CMGL: 0,\"REC READ\",\"

eL\",\"|\",\"
\",80,0\r\n,0\r\n\r\n+CMGL: 0,\"REC READ\",\" eL\",\"|\",\"
\",80,0\r\n,0\r\n\r\n+CMGL: 0,\"REC READ\",\"

eL\",\"|\",\"
\",80,0\r\n,0\r\n\r\n+CMGL: 0,\"REC READ\",\" eL\",\"|\",\"
\",80,0\r\n,0\r\n\r\n+CMGL: 0,\"REC READ\",\"

eL\",\"|\",\"
\",80,0\r\n,0\r\n\r\n+CMGL: 0,\"REC READ\",\" eL\",\"|\",\"
\",80,0\r\n,0\r\n\r\n+CMGL: 0,\"REC READ\",\"

eL\",\"|\",\"
\",80,0\r\n,0\r\n\r\n+CMGL: 0,\"REC READ\",\" eL\",\"|\",\"
\",80,0\r\n,0\r\n\r\n+CMGL: 0,\"REC READ\",\"

Please tell me what is wrong with the AT commands or i am giving some wrong parameters or missing something . Please help.

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BaburMan

Not sure on your question.
But I used the code at this post successfully on several modems.
May find some answers there modem

You may also consider the escaped line return, try use (char)13 instead of \r.
Your compiler will inderstand \r but your modem may not, just a guess...could well be wrong.

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