lulzzz/iot-device-simulator

An IoT Device Simulator using Service Fabric

IoT Device Simulator for Load Scenarios

Installing and Running the Simulator

To install the application you can click on the "Deploy to Azure" button below and enter in values for the parameters.

After the environment is provisioned, we can go to the Azure Storage Account and upload the required files. In a folder called 'run' create a main-simulation.json file with a similar definition to the json here.

[
    {
        "Id": "a2da9567-ff24-4ab8-8b24-795a77139328",
        "DeviceName": "SimulatedFridge-0001",
        "DeviceType": "Fridge",
        "Interval": 5
    }
]

Then in a folder called scripts, we would create an example csharp script file (named Fridge.cscript in our example)

class MinMax
{
	[JsonProperty("min")]
	public double Minimum { get; set; }
	[JsonProperty("max")]
	public double Maximum { get; set; }
}

class InitialState
{
	public MinMax Temperature { get; set; }
	public MinMax Humidity { get; set; }
}

class FridgeState
{
	public PreviousState PreviousState { get; set; }
	public CurrentState CurrentState { get; set; }
	public InitialState InitialState { get; set; }
}

class PreviousState
{
	public double Temperature { get; set; }
	public double Humidity { get; set; }
}

class CurrentState
{
	public double Temperature { get; set; }
	public double Humidity { get; set; }
}

double GetRandomNumber(double minimum, double maximum)
{
	var random = new Random();
	return random.NextDouble() * (maximum - minimum) + minimum;
}

var deviceState = JsonConvert.DeserializeObject<FridgeState>(DeviceState);

if (deviceState.PreviousState == null)
{
	deviceState.PreviousState = new PreviousState()
	{
		Temperature = GetRandomNumber(deviceState.InitialState.Temperature.Minimum, deviceState.InitialState.Temperature.Maximum),
		Humidity = GetRandomNumber(deviceState.InitialState.Humidity.Minimum, deviceState.InitialState.Humidity.Maximum),
	};
}

if (deviceState.CurrentState != null)
{
	deviceState.PreviousState.Temperature = deviceState.CurrentState.Temperature;
	deviceState.PreviousState.Humidity = deviceState.CurrentState.Humidity;
}
else
	deviceState.CurrentState = new CurrentState();

var random = new Random();
var oddEven = random.Next(1, 2) % 2 == 0;
if (oddEven)
	deviceState.CurrentState.Temperature = deviceState.PreviousState.Temperature + 1;
else
	deviceState.CurrentState.Temperature = deviceState.PreviousState.Temperature - 1;

oddEven = random.Next(1, 2) % 2 == 0;
if (oddEven)
	deviceState.CurrentState.Humidity = deviceState.PreviousState.Humidity + 1;
else
	deviceState.CurrentState.Humidity = deviceState.PreviousState.Humidity - 1;

var json = JsonConvert.SerializeObject(deviceState.CurrentState);
return json;

Then we would create a folder called state that would hold our initial device state (which is used in the above script)

{
    "initialState": {
      "temperature": {
        "min": 45,
        "max": 70
      },
      "humidity": {
        "min": 10,
        "max": 25
      }
    }
  }

Once the files are there, Service Fabric will pick them up and start sending device data to your IoT Hub.

Configuring and Runing the Simulator

We will need to change a few configuration files in order for the system to connect properly.

The first configuration file is under iot-device-simulator\src\DeviceSimulation\DeviceGenerator\PackageRoot\Config\Settings.xml This will contain the connection string for our Azure Storage Account.

<?xml version="1.0" encoding="utf-8" ?>
<Settings xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://schemas.microsoft.com/2011/01/fabric">
  <Section Name="ConnectionStrings">
    <Parameter Name="StorageAccountConnectionString" Value="DefaultEndpointsProtocol=https;AccountName=jwiotsolution;AccountKey=...;EndpointSuffix=core.windows.net" />
  </Section>
</Settings>

The second configuration file is under iot-device-simulator\src\DeviceSimulation\DeviceSimulator\PackageRoot\Config\Settings.xml This configuration file contains the value to connect to the IoT Hub that we want our simulated devices to connect to.

<?xml version="1.0" encoding="utf-8" ?>
<Settings xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://schemas.microsoft.com/2011/01/fabric">
  <Section Name="ConnectionStrings">
    <Parameter Name="IoTHubConnectionString" Value="HostName=jwiotsolutionfcdcc.azure-devices.net;SharedAccessKeyName=iothubowner;SharedAccessKey=..." />
  </Section>

  <Section Name="IoTHub">
    <Parameter Name="HubName" Value="jwiotsolutionfcdcc" />
  </Section>
</Settings>

Then the application should run by pressing F5

Contribution Guidelines

TBD