.NET nanoFramework RAK11200 – Azure IoT Hub HTTP SAS Tokens

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This is the simplest .NET nanoFramework Azure IoT Hub client I could come up with (inspired by this nanoFramework sample).

My test setup was a RAKwireless RAK11200 WisBlock WiFi Module, RAK5005 WisBlock Base Board or RAK19001 WisBlock Dual IO Base Board and RAK1901 WisBlock Temperature and Humidity Sensor

RAK112000+RAK5005-O+RAK1901 Test rig
RAK112000+RAK19001+RAK1901 Test rig

I used a RAK1901 WisBlock Temperature and Humidity Sensor because it has nanoFramework.IoTDevice library support

public class Program
{
    private static TimeSpan SensorUpdatePeriod = new TimeSpan(0, 30, 0);

    private static HttpClient _httpClient;

    public static void Main()
    {
        Debug.WriteLine("devMobile.IoT.RAK.Wisblock.AzureIoHub.RAK1901 starting");

        Configuration.SetPinFunction(Gpio.IO04, DeviceFunction.I2C1_DATA);
        Configuration.SetPinFunction(Gpio.IO05, DeviceFunction.I2C1_CLOCK);

        if (!WifiNetworkHelper.ConnectDhcp(Config.Ssid, Config.Password, requiresDateTime: true))
        {
            if (NetworkHelper.HelperException != null)
            {
                Debug.WriteLine($"WifiNetworkHelper.ConnectDhcp failed {NetworkHelper.HelperException}");
            }

            Thread.Sleep(Timeout.Infinite);
        }

        _httpClient = new HttpClient
        {
            SslProtocols = System.Net.Security.SslProtocols.Tls12,
            HttpsAuthentCert = new X509Certificate(Config.DigiCertBaltimoreCyberTrustRoot),
            BaseAddress = new Uri($"https://{Config.AzureIoTHubHostName}.azure-devices.net/devices/{Config.DeviceID}/messages/events?api-version=2020-03-13"),
        };
        _httpClient.DefaultRequestHeaders.Add("Authorization", Config.SasKey);

        I2cConnectionSettings settings = new(1, Shtc3.DefaultI2cAddress);
        I2cDevice device = I2cDevice.Create(settings);
        Shtc3 shtc3 = new(device);

        while (true)
        {
            if (shtc3.TryGetTemperatureAndHumidity(out var temperature, out var relativeHumidity))
            {
                Debug.WriteLine($"Temperature {temperature.DegreesCelsius:F1}°C  Humidity {relativeHumidity.Value:F0}%");

                string payload = $"{{\"RelativeHumidity\":{relativeHumidity.Value:F0},\"Temperature\":{temperature.DegreesCelsius.ToString("F1")}}}";

                try
                {
                    using (HttpContent content = new StringContent(payload))
                    using (HttpResponseMessage response = _httpClient.Post("", content))
                    {
                        Console.WriteLine($"{DateTime.UtcNow:HH:mm:ss} Response code:{response.StatusCode}");

                        response.EnsureSuccessStatusCode();
                    }
                }
                catch(Exception ex)
                {
                    Debug.WriteLine($"Azure IoT Hub POST failed:{ex.Message}");
                }
            }

            Thread.Sleep(SensorUpdatePeriod);
        }
    }
}

I generated the Azure IoT Hub Shared Access Signature(SAS) Tokens (10800 minutes is 1 week) with Azure IoT Explorer (Trim the SAS key so it starts with SharedAccessSignature sr=….)

Azure IoT Explorer SAS Token Generation

I was using Azure IoT Explorer to monitor the telemetry and found that the initial versions of the application would fail after 6 or 7 hours. After reviewing the code I added a couple of “using” statements which appear to have fixed the problem as the soak test has been running for 12hrs, 24hrs, 36hrs, 48hrs, 96hrs…

2 thoughts on “.NET nanoFramework RAK11200 – Azure IoT Hub HTTP SAS Tokens”

  1. Pingback: .NET nanoFramework BME680 Library Debugging Part 1 | devMobile's blog

  2. Pingback: .NET nanoFramework RAK11200 – Azure IoT Hub HTTP Basic – Revisited | devMobile's blog

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