Integral Design

At this stage of development, the NetWorkUp event of GHI Electronics Ethernet_J11D module does not work with the latest .NET Gadgeteer SDK. The reasons are explained in the forum thread here: http://www.tinyclr.com/forum/21/5010/  The fix is not public yet.

GHI has good documentation, so I adapted code from their example in the topic: Ethernet Class.  So far, the ethernet class I created only supports my application using the Seeed Pulse Oximeter sensor.  The single method of my class sends data from the Seeed Pulse Oximeter to a Web service.  I’ll post this complete scenario eventually, but you can piece it together from a couple of other posts:

Seeed Pulse Oximeter .NET Gadgeteer Module 

REST Web Service to Record Data from a .NET Gadgeteer Sensor Device

To use the EthernetConnection class, create an instance and call the single method as in the following ButtonPressed event handler.

    EthernetConnection connection = new EthernetConnection();

    void button_ButtonPressed(Button sender, Button.ButtonState state)
    {
        Debug.Print("Sending data");
        bool success = connection.SendPulseOximeterData("TestName3", "65", "98");
    }

The EthernetConnection class is shown in the following code block.

class EthernetConnection
    {
        static public ManualResetEvent NetworkAvailablityBlocking = null;
        NetworkInterface[] netif = NetworkInterface.GetAllNetworkInterfaces();
        static public bool network_is_read = false;

        public EthernetConnection()
        {

            if (!GHINET.Ethernet.IsEnabled)
            {
                GHINET.Ethernet.Enable();
            }

            if (!GHINET.Ethernet.IsCableConnected)
            {
                Debug.Print("Cable is not connected!");
                NetworkAvailablityBlocking.Reset();
                while (!NetworkAvailablityBlocking.WaitOne(5000, false))
                {
                    if (!GHINET.Ethernet.IsCableConnected)
                    {
                        Debug.Print("Cable is not connected!");
                        Debug.Print("Still waiting.");
                    }
                    else
                        break;
                }
            }

            Debug.Print("Ethernet cable is connected!");
            Debug.Print("Enable DHCP");
            try
            {
                if (!netif[0].IsDhcpEnabled)
                      netif[0].EnableDhcp();  // This function is blocking
                else
                {
                    netif[0].RenewDhcpLease();  // This function is blocking
                }
                network_is_read = true;
                Debug.Print("Network settings:");
                Debug.Print("IP Address: " + netif[0].IPAddress);
                Debug.Print("Subnet Mask: " + netif[0].SubnetMask);
                Debug.Print("Default Getway: " + netif[0].GatewayAddress);
                Debug.Print("DNS Server: " + netif[0].DnsAddresses[0]);
            }
            catch
            {
                Debug.Print("DHCP Faild");
            }
        }

        public bool SendPulseOximeterData(string name, string pulse, string oxg)
        {
            bool success = false;

            using (HttpWebRequest request =
                             WebRequest.Create("http://integral-data.com/PulseOxgData/reading/" +
                             name + "/" + pulse + "/" + oxg) as HttpWebRequest)
            {
                request.Method = "POST";
                request.ContentLength = 0;

                HttpWebResponse response;
                try
                {
                    response = request.GetResponse() as HttpWebResponse;

                    if(response.StatusCode == HttpStatusCode.OK)
                        success = true;

                    response.Close();
                }
                catch (Exception ex)
                {
                    string exception = ex.Message + " Inner:" + ex.InnerException;
                    Debug.Print(exception);

                    Debug.Print(exception);
                }
            }

            return success;
        }

    }