GSMComm

GSMComm is a .NET library for sending and receiving SMS using any compatible GSM device. It connects via the COM ports on your host machine and supports USB COM ports as well.

Components

The library consists of 3 components.

GSMCommunication is the core library which handles communication between the GSM device and your application via a COM port.
GSMCommServer is a fully web server which allows sending and receiving SMS messages.
PDUConverter contains classes for converting between .NET objects and the PDU format. This is used primarily to send and decode SMS messages.

Usage

GSMCommServer

To use the GSMCommServer, it's as simple as creating a console application and adding a reference to the library. Then, you can do something like below.

using (SmsServer server = new SmsServer())
{
	// Set the COM port for communicating with the device. (By default this is COM1)
	server.PortName = "COM9";
	
	// Set the baud rate. (By default this is 19200)
	server.BaudRate = 115200;

	// Allow anonymous users to use the web service. (By default this is false)
	server.AllowAnonymous = true;

	// Set the port on which our web service will run. (By default this is 2000)
	server.NetworkPort = 8080;

	// Start the server.
	server.Start();
}

Once you've finished using it, you can stop the server.

server.Stop();

GSMCommunication

If you'd like to write your own application which makes use of SMS capabilities, you can use the GSMCommunication library like below.

// Create a communications object on COM port 9 with the baud rate 115200.
GsmCommMain comm = new GsmCommMain(9, 115200);

Once you've instantiated the object, you can use it like below.

Sending an SMS

// Set a phone number and message.
string phoneNumber = "+11111111111";
string text = "Hello world.";

try
{
	// Attempt to send the message.
    comm.SendMessage(new SmsSubmitPdu(text, phoneNumber));

	// Message sending was successful!
}
catch (CommException e)
{
	// There was an issue sending the message.
}

Reading SMS from the SIM card

// Read the messages from the SIM card. (SM specifies the SIM storage.)
DecodedShortMessage[] messages = comm.ReadMessages(PhoneMessageStatus.ReceivedUnread, "SM");

foreach (DecodedShortMessage message in messages)
{
    SmsPdu pdu = message.Data;

	if (pdu is SmsDeliverPdu)
	{
		// Cast the message data.
		SmsDeliverPdu msgPdu = (SmsDeliverPdu)pdu;

		// Get the data from the message.
		string phoneNumber = pdu.OriginatingAddress;
		string text = pdu.UserDataText;
        DateTime timestamp = pdu.GetTimestamp().ToDateTime();

		// Do something with the data.
	}
	else
	{
		// There's an issue with this message.
	}
}