/// <summary>
/// Connect
/// Connect to Azure IoT Hub ans start the send and receive loops
/// </summary>
/// <returns></returns>
public bool Connect()
{
try
{
// Create Azure IoT Hub Client and open messaging channel
deviceClient = DeviceClient.CreateFromConnectionString(ConnectionString(), TransportType.Http1);
deviceClient.OpenAsync();
IsConnected = true;
// Send Device Meta Data to IoT Suite
sendData(Model);
CancellationToken ct = TokenSource.Token;
// Create send task
Task.Factory.StartNew(async() => {
while (true)
{
if (SendTelemetryData)
{
// Send current telemetry data
sendData(this.Telemetry);
}
await Task.Delay(SendTelemetryFreq);
if (ct.IsCancellationRequested)
{
// Cancel was called
Debug.WriteLine("Sending task canceled");
break;
}
}
}, ct);
// Create receive task
Task.Factory.StartNew(async() =>
{
while (true)
{
// Receive message from Cloud (for now this is a pull because only HTTP is available for UWP applications)
Message message = await deviceClient.ReceiveAsync();
if (message != null)
{
try
{
// Read message and deserialize
var obj = DeSerialize(message.GetBytes());
ReceivedMessage command = new ReceivedMessage();
command.Name = obj["Name"].ToString();
command.MessageId = obj["MessageId"].ToString();
command.CreatedTime = obj["CreatedTime"].ToString();
command.Parameters = new Dictionary <string, object>();
foreach (dynamic param in obj["Parameters"])
{
command.Parameters.Add(param.Name, param.Value);
}
// Invoke message received callback
OnReceivedMessage(new ReceivedMessageEventArgs(command));
// We received the message, indicate IoTHub we treated it
await deviceClient.CompleteAsync(message);
}
catch (Exception e)
{
// Something went wrong. Indicate the backend that we coudn't accept the message
Debug.WriteLine("Error while deserializing message received: " + e.Message);
await deviceClient.RejectAsync(message);
}
}
if (ct.IsCancellationRequested)
{
// Cancel was called
Debug.WriteLine("Receiving task canceled");
break;
}
}
}, ct);
}
catch (Exception e)
{
Debug.WriteLine("Error while trying to connect to IoT Hub:" + e.Message.ToString());
deviceClient = null;
return(false);
}
return(true);
}
public ReceivedMessageEventArgs(ReceivedMessage message)
{
Message = message;
}