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| // Copyright (c) Microsoft. All rights reserved. | ||
| // Licensed under the MIT license. See LICENSE file in the project root for full license information. | ||
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| // This application uses the Azure IoT Hub device SDK for .NET | ||
| // For samples see: https://github.com/Azure/azure-iot-sdk-csharp/tree/master/iothub/device/samples | ||
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| using Microsoft.Azure.Devices.Client; | ||
| using System; | ||
| using System.Linq; | ||
| using System.Text; | ||
| using System.Text.Json; | ||
| using System.Threading; | ||
| using System.Threading.Tasks; | ||
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| namespace SimulatedDevice | ||
| { | ||
| /// <summary> | ||
| /// This sample illustrates the very basics of a device app sending telemetry. For a more comprehensive device app sample, please see | ||
| /// <see href="https://github.com/Azure-Samples/azure-iot-samples-csharp/tree/master/iot-hub/Samples/device/DeviceReconnectionSample"/>. | ||
| /// </summary> | ||
| internal class Program | ||
| { | ||
| private static DeviceClient s_deviceClient; | ||
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| // The device connection string to authenticate the device with your IoT hub. | ||
| // Using the Azure CLI: | ||
| // az iot hub device-identity show-connection-string --hub-name {YourIoTHubName} --device-id MyDotnetDevice --output table | ||
| private static string s_connectionString = "{Your device connection string here}"; | ||
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| private static async Task Main(string[] args) | ||
| { | ||
| Console.WriteLine("IoT Hub Quickstarts #1 - Simulated device."); | ||
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| // This sample accepts the device connection string as a parameter, if present | ||
| CheckForConnectionStringArgument(args); | ||
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| // Connect to the IoT hub using the MQTT protocol | ||
| s_deviceClient = DeviceClient.CreateFromConnectionString(s_connectionString, TransportType.Mqtt); | ||
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| // Set up a condition to quit the sample | ||
| Console.WriteLine("Press control-C to exit."); | ||
| using var cts = new CancellationTokenSource(); | ||
| Console.CancelKeyPress += (sender, eventArgs) => | ||
| { | ||
| eventArgs.Cancel = true; | ||
| cts.Cancel(); | ||
| Console.WriteLine("Device simulator exit requested..."); | ||
| }; | ||
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| // Run the telemetry loop | ||
| await SendDeviceToCloudMessagesAsync(cts.Token); | ||
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| Console.WriteLine("Device simulator finished."); | ||
| } | ||
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| private static void CheckForConnectionStringArgument(string[] args) | ||
| { | ||
| if (args.Any()) | ||
| { | ||
| try | ||
| { | ||
| var cs = IotHubConnectionStringBuilder.Create(args.First()); | ||
| s_connectionString = cs.ToString(); | ||
| } | ||
| catch (Exception) { } | ||
| } | ||
| } | ||
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| // Async method to send simulated telemetry | ||
| private static async Task SendDeviceToCloudMessagesAsync(CancellationToken ct) | ||
| { | ||
| // Initial telemetry values | ||
| double minTemperature = 20; | ||
| double minHumidity = 60; | ||
| var rand = new Random(); | ||
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| while (!ct.IsCancellationRequested) | ||
| { | ||
| double currentTemperature = minTemperature + rand.NextDouble() * 15; | ||
| double currentHumidity = minHumidity + rand.NextDouble() * 20; | ||
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| // Create JSON message | ||
| string messageBody = JsonSerializer.Serialize( | ||
| new | ||
| { | ||
| temperature = currentTemperature, | ||
| humidity = currentHumidity, | ||
| }); | ||
| using var message = new Message(Encoding.ASCII.GetBytes(messageBody)) | ||
| { | ||
| ContentType = "application/json", | ||
| ContentEncoding = "utf-8", | ||
| }; | ||
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| // Add a custom application property to the message. | ||
| // An IoT hub can filter on these properties without access to the message body. | ||
| message.Properties.Add("temperatureAlert", (currentTemperature > 30) ? "true" : "false"); | ||
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| // Send the telemetry message | ||
| await s_deviceClient.SendEventAsync(message); | ||
| Console.WriteLine($"{DateTime.Now} > Sending message: {messageBody}"); | ||
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| await Task.Delay(1000); | ||
| } | ||
| } | ||
| } | ||
| } |
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