public async Task OnGetAsync()
{
// Read ConfigData
ConfigData = await _configDataService.ReadAsync();
}
public async Task <string> SendAsync(int id)
{
// Get full item content
Item item = await ReadAsync(id);
// Obtain IoT Hub connection string and Azure Sphere device name
ConfigData configData = await _configDataService.ReadAsync();
// Prepare device method call via Iot Hub
string methodName = _config.GetValue <string>("AzureSphereDevice:directMethodName");
int methodTimeout = _config.GetValue <int>("AzureSphereDevice:directMethodCallTimeout");
var methodInvocation = new CloudToDeviceMethod(methodName)
{
ResponseTimeout = TimeSpan.FromSeconds(methodTimeout)
};
methodInvocation.SetPayloadJson(JsonSerializer.Serialize(item));
ServiceClient serviceClient;
CloudToDeviceMethodResult deviceResult;
try
{
serviceClient = ServiceClient.CreateFromConnectionString(configData.IotHubService);
using (serviceClient)
{
// Invoke the direct method asynchronously and get the response from IoT device.
deviceResult = await serviceClient.InvokeDeviceMethodAsync(configData.AzureSphereDevice, methodInvocation);
}
}
catch (FormatException fex)
{
if (fex.Message.Equals("Malformed Token"))
{
return("ERROR: Invalid Iot Hub Service Connection String");
}
return("ERROR: Iot Hub Message Format Exception");
}
catch (ArgumentException)
{
return("ERROR: Invalid Iot Hub Service Connection String");
}
catch (DeviceNotFoundException dnfex)
{
if (dnfex.Message.Contains(":404001,"))
{
// errorCode 404001: Device not registered or incorrect name
return("ERROR: Device not registered in IoT Hub");
}
else if (dnfex.Message.Contains(":404103,"))
{
// errorCode 404103: Timeout
return("ERROR: Timeout connecting device");
}
return("ERROR: Device not found");
}
// Azure Sphere returns status and message property
bool success = true;
string message;
try
{
JsonDocument document = JsonDocument.Parse(deviceResult.GetPayloadAsJson());
message = document.RootElement.GetProperty("message").GetString();
success = document.RootElement.GetProperty("success").GetBoolean();
}
catch (JsonException)
{
message = "ERROR: Response parsing failed";
}
if (!success)
{
message += "ERROR: ";
}
return(message);
}