How to make a connection to the usp external device via asp net core web app


ASP.NET is a popular programming language used for developing web applications. In this article, we will discuss how to make a connection to a USB external using ASP.NET Core web app.

Step 1: Install Required Packages

Before we start, we need to install the required packages for USB device communication. Open your ASP.NET Core web app project in Visual Studio and navigate to the NuGet Package Manager. Search for the following packages and install them:

Install-Package LibUsbDotNet
Install-Package LibUsbDotNet.Native

Step 2: Detect USB Device

Once the packages are , we can proceed with the USB device. , we need to find the device using its vendor ID and ID. the USB device to your computer and open the Device Manager. -click on the device and select “Properties”. In the “Details” tab, find the “Hardware Ids” property. Note down the vendor ID and product ID.

using LibUsbDotNet;
using LibUsbDotNet.Main;

public static UsbDevice FindDevice(int vendorId, int productId)
    UsbDeviceFinder  = new UsbDeviceFinder(vendorId, productId);
    UsbDevice device = UsbDevice.OpenUsbDevice(finder);
    return device;

Step 3: Read and Write Data

Now that we have the USB device, we can read and write data to it. We can use the ControlTransfer method to send control requests to the device. Here's an example of reading data from the USB device:

public static byte[] ReadData(UsbDevice device, int endpointId, int bufferSize)
    UsbEndpointReader reader = device.OpenEndpointReader((ReadEndpointID)endpointId);
    byte[] buffer = new byte[bufferSize];
    reader.Read(buffer, 5000, out int bytesRead);
    return buffer;

And here's an example of writing data to the USB device:

public static void WriteData(UsbDevice device, int endpointId, byte[] data)
    UsbEndpointWriter writer = device.OpenEndpointWriter((WriteEndpointID)endpointId);
    writer.Write(data, 5000, out int bytesWritten);


In this article, we have discussed how to make a connection to a USB external device using ASP.NET Core web app. We have covered the to detect the USB device and read/write data to it. By following these steps, you can integrate USB device communication into your ASP.NET Core web app.

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