Logiccode GSM SMS.Net Library: Complete Guide for .NET Developers

How to Send SMS with Logiccode GSM SMS.Net Library — Step-by-Step Tutorial

Overview

This tutorial shows a complete, practical workflow for sending SMS using the Logiccode GSM SMS.Net Library in a .NET application. It assumes a GSM modem (or phone) connected to your PC (USB/serial) and a supported COM port. Example code uses C# and .NET (compatible with .NET Framework or .NET Core/5+).

Prerequisites

• A Windows PC with a GSM modem or phone connected and drivers installed.
• COM port name for the modem (e.g., COM3).
• SIM card with SMS capability and sufficient balance.
• Visual Studio (or other C# IDE).
• Logiccode GSM SMS.Net Library DLL (add reference to your project).
• Basic knowledge of C# and asynchronous programming.

1) Create a new C# project

1. Open Visual Studio.
2. Create a new Console App (.NET Core/.NET 5+ or .NET Framework) or a Windows Forms/WPF app if you need UI.
3. Add the Logiccode GSM SMS.Net Library DLL to the project references:
   • Right-click References → Add Reference → Browse → select the Logiccode GSM SMS.Net .dll.

2) Import namespaces

At the top of your code file, add the required using statements. The exact namespace may vary depending on library version; common examples:

csharp
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using Logiccode.GSM;
using Logiccode.GSM.SMS;
using System;
using System.Threading;

If the library uses a different root namespace, adjust accordingly (check the DLL’s object browser).

3) Initialize and configure the modem connection

Use the library’s modem or gateway class to configure COM port, baud rate, and other settings. Here’s a typical synchronous example; adapt to your library API if names differ.

csharp
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class Program
{
static void Main()
    {
        // Adjust to the actual class names in the Logiccode library
        var gateway = new GsmGateway(“COM3”, 115200); // COM port and baud rate
        gateway.SimPin = ””; // set SIM PIN if required
        gateway.Connect();


        if (!gateway.IsConnected)
        {
            Console.WriteLine(“Failed to connect to GSM modem.”);
            return;
        }

        var message = new SmsMessage(”+1234567890”, “Hello from Logiccode GSM SMS.Net Library!”);
        bool sent = gateway.SendMessage(message);

        Console.WriteLine(sent ? “Message sent successfully.” : “Message failed to send.”);


        gateway.Disconnect();
    }
}

Notes:

• Replace “GsmGateway”, “SmsMessage”, and method names with actual types/methods from the library if they differ.
• Use correct phone number format (international format + country code).

4) Asynchronous and event-driven sending (recommended)

For production apps, use async/event-driven patterns to handle delivery reports, incoming messages, and errors without blocking the UI.

csharp
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using System;
using Logiccode.GSM;
using Logiccode.GSM.SMS;
using System.Threading.Tasks;

class Program
{
    static async Task Main()
    {
        var gateway = new GsmGateway(“COM3”, 115200);
        gateway.IncomingMessage += Gateway_IncomingMessage;
        gateway.MessageSent += Gateway_MessageSent;
        gateway.ErrorOccurred += Gateway_ErrorOccurred;

        gateway.SimPin = ””;
        await gateway.ConnectAsync();

        var msg = new SmsMessage(”+1234567890”, “Async SMS via Logiccode library”);
        var result = await gateway.SendMessageAsync(msg);

        Console.WriteLine(result.Success ? \("Sent ID: </span><span class="token interpolation-string interpolation" style="color: rgb(57, 58, 52);">{</span><span class="token interpolation-string interpolation expression language-csharp">result</span><span class="token interpolation-string interpolation expression language-csharp">.</span><span class="token interpolation-string interpolation expression language-csharp">MessageId</span><span class="token interpolation-string interpolation" style="color: rgb(57, 58, 52);">}</span><span class="token interpolation-string" style="color: rgb(163, 21, 21);">"</span><span> </span><span class="token" style="color: rgb(57, 58, 52);">:</span><span> </span><span class="token interpolation-string" style="color: rgb(163, 21, 21);">\)“Send failed: {result.ErrorMessage}”);

        // Keep app alive to receive events (for demo)
        await Task.Delay(TimeSpan.FromSeconds(5));
        gateway.Disconnect();
    }

    private static void Gateway_IncomingMessage(object sender, IncomingMessageEventArgs e)
    {
        Console.WriteLine(\("Received from </span><span class="token interpolation-string interpolation" style="color: rgb(57, 58, 52);">{</span><span class="token interpolation-string interpolation expression language-csharp">e</span><span class="token interpolation-string interpolation expression language-csharp">.</span><span class="token interpolation-string interpolation expression language-csharp">Sender</span><span class="token interpolation-string interpolation" style="color: rgb(57, 58, 52);">}</span><span class="token interpolation-string" style="color: rgb(163, 21, 21);">: </span><span class="token interpolation-string interpolation" style="color: rgb(57, 58, 52);">{</span><span class="token interpolation-string interpolation expression language-csharp">e</span><span class="token interpolation-string interpolation expression language-csharp">.</span><span class="token interpolation-string interpolation expression language-csharp">Text</span><span class="token interpolation-string interpolation" style="color: rgb(57, 58, 52);">}</span><span class="token interpolation-string" style="color: rgb(163, 21, 21);">"</span><span class="token" style="color: rgb(57, 58, 52);">)</span><span class="token" style="color: rgb(57, 58, 52);">;</span><span> </span><span>    </span><span class="token" style="color: rgb(57, 58, 52);">}</span><span> </span> <span>    </span><span class="token" style="color: rgb(0, 0, 255);">private</span><span> </span><span class="token" style="color: rgb(0, 0, 255);">static</span><span> </span><span class="token return-type" style="color: rgb(0, 0, 255);">void</span><span> </span><span class="token" style="color: rgb(57, 58, 52);">Gateway_MessageSent</span><span class="token" style="color: rgb(57, 58, 52);">(</span><span class="token" style="color: rgb(0, 0, 255);">object</span><span> sender</span><span class="token" style="color: rgb(57, 58, 52);">,</span><span> </span><span class="token" style="color: rgb(43, 145, 175);">MessageSentEventArgs</span><span> e</span><span class="token" style="color: rgb(57, 58, 52);">)</span><span> </span><span>    </span><span class="token" style="color: rgb(57, 58, 52);">{</span><span> </span><span>        Console</span><span class="token" style="color: rgb(57, 58, 52);">.</span><span class="token" style="color: rgb(57, 58, 52);">WriteLine</span><span class="token" style="color: rgb(57, 58, 52);">(</span><span class="token interpolation-string" style="color: rgb(163, 21, 21);">\)“Message sent to {e.Recipient}, ID: {e.MessageId}”);
    }

    private static void GatewayErrorOccurred(object sender, ErrorEventArgs e)
    {
        Console.WriteLine($“Error: {e.Exception?.Message ?? e.Message}”);
    }
}

csharp
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using Logiccode.GSM;
using Logiccode.GSM.SMS;

var gw = new GsmGateway(“COM3”, 115200);
gw.Connect();
var sms = new SmsMessage(”+1234567890”, “Test message”);
if (gw.SendMessage(sms))
    Console.WriteLine(“Sent”);
else
    Console.WriteLine(“Failed”);
gw.Disconnect();