Getting error with sending SMS with AT Commands? - c++

Question

Please have a look at the following code:
#pragma once
using namespace System::IO::Ports;
using namespace System::Text::RegularExpressions;
using namespace System::Collections::Generic;
ref class SMS
{
public:
SMS(void);
void sendMessage();
private:
System::IO::Ports::SerialPort ^port;
};
And the cpp file
#include "StdAfx.h"
#include "SMS.h"
SMS::SMS(void)
{
//Initialize the Serial Port
port = gcnew System::IO::Ports::SerialPort();
port->PortName = "COM12";
port->BaudRate = 9600;
port->Parity = Parity::None;
port->DataBits = 8;
port->StopBits = StopBits::One;
port->Handshake = Handshake::RequestToSend;
port->DtrEnable = true;
port->RtsEnable = true;
port->NewLine = System::Environment::NewLine;
if(!port->IsOpen)
{
port->Open();
}
//Set message format
port->WriteLine("AT+CMGF=1");
//Turn off echo
port->WriteLine("ATE0");
//Set memory configurations
port->WriteLine("AT+CPMS=\"ME\",\"ME\",\"ME\"");
}
//This method will send the SMS
void SMS::sendMessage()
{
if(!port->IsOpen)
{
port->Open();
}
port->WriteLine("AT+CMGS=\"012121212\"");
port->WriteLine("Test Message From C#");
port->WriteLine(System::Convert::ToString((char)(26)));
port->Close();
}
I am trying to send SMS by accessing the dongle. The port is correct and the dongle also fine because it responded to my friend's code few hours back. What am I doing wrong here? Have I done anything incorrect with C++/CLI ? AT Commands?

Answer 1

try adding "CR" "LF" (Carriage Return and Line Feed characters) after each AT command, some GSM dongles (like SIM900) needem in order to work. I hope this helps
Regards

Answer 2

if for win32,..
prefer using
HFILE OpenFile(
LPCSTR lpFileName, // pointer to filename
LPOFSTRUCT lpReOpenBuff, // pointer to buffer for file information
UINT uStyle // action and attributes
);
with other events,...
if using SMS gateway with modem AT command capability, that's fine for direct read and write to COM port
if U using cell phone, many of this will not work. example nokia 6070, 3100 model group
best test it using hyperterminal.
I used CBuildre6 for
https://sites.google.com/site/xpressdms/rosegarden
cheer.