Netduino Plus Web Server Hello World

This tutorial will show you how to create a simple Netduino plus web server. The Netduino plus will respond with "Hello World" when we make a HTTP request over it's Ethernet port. This is a step by step how to with all of the code for the project available for download at the end of this post.

• Let's start by creating a new project. Name it "WebserverHelloWorld"

• Right click on project name and choose to "Add" > "Add new item"

• Add new "Class" and name is "WebServer.cs"

• Here is a very simple version of a web server. It will listen for requests and respond with "Hello World". It will also blink the on-board LED when a web request comes into the Netduino plus.

public class WebServer : IDisposable
    {
        private Socket socket = null;   
        //open connection to onbaord led so we can blink it with every request
        private OutputPort led = new OutputPort(Pins.ONBOARD_LED, false);
        public WebServer()
        {
            //Initialize Socket class
            socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            //Request and bind to an IP from DHCP server
            socket.Bind(new IPEndPoint(IPAddress.Any, 80));
            //Debug print our IP address
            Debug.Print(Microsoft.SPOT.Net.NetworkInformation.NetworkInterface.GetAllNetworkInterfaces()[0].IPAddress);
            //Start listen for web requests
            socket.Listen(10);
            ListenForRequest();
        }

        public void ListenForRequest()
        {
            while (true)
            {
                using (Socket clientSocket = socket.Accept())
                {
                    //Get clients IP
                    IPEndPoint clientIP = clientSocket.RemoteEndPoint as IPEndPoint;
                    EndPoint clientEndPoint = clientSocket.RemoteEndPoint;
                    //int byteCount = cSocket.Available;
                    int bytesReceived = clientSocket.Available;
                    if (bytesReceived > 0)
                    {
                        //Get request
                        byte[] buffer = new byte[bytesReceived];
                        int byteCount = clientSocket.Receive(buffer, bytesReceived, SocketFlags.None);
                        string request = new string(Encoding.UTF8.GetChars(buffer));
                        Debug.Print(request);
                        //Compose a response
                        string response = "Hello World";
                        string header = "HTTP/1.0 200 OK\r\nContent-Type: text; charset=utf-8\r\nContent-Length: " + response.Length.ToString() + "\r\nConnection: close\r\n\r\n";
                        clientSocket.Send(Encoding.UTF8.GetBytes(header), header.Length, SocketFlags.None);
                        clientSocket.Send(Encoding.UTF8.GetBytes(response), response.Length, SocketFlags.None);
                        //Blink the onboard LED
                        led.Write(true);
                        Thread.Sleep(150);
                        led.Write(false);
                    }
                }
            }
        }
        #region IDisposable Members
        ~WebServer()
        {
            Dispose();
        }
        public void Dispose()
        {
            if (socket != null)
                socket.Close();
        }
        #endregion
    }

• Now add the following code to Program.cs.

public static void Main()
        {
            Microsoft.SPOT.Net.NetworkInformation.NetworkInterface.GetAllNetworkInterfaces()[0].EnableDhcp();
            WebServer webServer = new WebServer();
            webServer.ListenForRequest();
        }

• Make your program run on the Netduino and not the emulator by right clicking on your project > "Properties"
• Select the ".Net Micro Framework" tab and change the following settings.
• Transport: USB
• Device: NetduinoPlus_NetduinoPlus

• Now run the program by pressing F5 or "Debug" > "Start Debugging".
• In the "Output" the program will write the Netduino plus IP address. If you don't have the "Output" window open, select "View" > "Output" to open it.
• Now open a web browser and type the Netduino plus IP in the address bar.
• You should receive back "Hello World" from the Netduino plus.

Here is a video demo of the web server running on the Netduino plus.

Here is the complete source code.