public async Task RemoveDeviceAsync(Thermostat thermostat)
{
ThermostatClient thermostatClient = deviceList.SingleOrDefault(d => d.Thermostat.Id == thermostat.Id);
if (thermostatClient == null)
{
return;
}
deviceList.Remove(thermostatClient);
await registry.RemoveDeviceAsync(thermostat.Id);
}
private async Task RunThermostatAsync(Thermostat thermostat, CancellationTokenSource cts)
{
try
{
while (true)
{
await thermostat.ReadTemperatureAsync(cts != null?cts.Token : CancellationToken.None);
}
}
catch (OperationCanceledException)
{
OnReadCanceled(thermostat);
}
}
public async Task AddDeviceAsync(Thermostat thermostat, int runForMilliseconds = -1)
{
bool exists = deviceList.SingleOrDefault(d => d.Id == thermostat.Id) != null;
if (exists)
{
return;
}
// Add the device to the IoT Hub
Device device;
try
{
device = await registry.AddDeviceAsync(new Device(thermostat.Id));
}
catch (DeviceAlreadyExistsException)
{
device = await registry.GetDeviceAsync(thermostat.Id);
}
// Creates a device client for communication with the IoT Hub
DeviceClient client = DeviceClient.Create(this.hostName,
new DeviceAuthenticationWithRegistrySymmetricKey(
device.Id,
device.Authentication.SymmetricKey.PrimaryKey));
// Register the event handler for when a new temperature is measured
thermostat.NewMeasure += (s, e) =>
{
SendMessagesAsync(s, e);
};
ThermostatClient thermostatClient = new ThermostatClient
{
Thermostat = thermostat,
Device = device,
Client = client,
RunForMilliseconds = runForMilliseconds
};
deviceList.Add(thermostatClient);
}
private async void SendMessagesAsync(Thermostat sender, NewMeasureEventArgs e)
{
ThermostatClient thermostatClient = deviceList.SingleOrDefault(d => d.Thermostat.Id == sender.Id);
if (thermostatClient == null)
{
return;
}
var telemetryDataPoint = new
{
deviceId = sender.Id,
temperature = e.Measure
};
var messageString = JsonConvert.SerializeObject(telemetryDataPoint);
var message = new Microsoft.Azure.Devices.Client.Message(Encoding.ASCII.GetBytes(messageString));
await thermostatClient.Client.SendEventAsync(message);
}
protected virtual void OnReadCanceled(Thermostat sender)
{
ReadCanceled?.Invoke(sender, EventArgs.Empty);
}