private async Task ResetConnectionAsync()
{
Logger.Log("ResetConnectionAsync start", LoggingLevel.Verbose);
// Attempt to close any existing connections before
// creating a new one
if (_deviceClient != null)
{
await _deviceClient.CloseAsync().ContinueWith((t) =>
{
var e = t.Exception;
if (e != null)
{
var msg = "existingClient.CloseAsync exception: " + e.Message + "\n" + e.StackTrace;
System.Diagnostics.Debug.WriteLine(msg);
Logger.Log(msg, LoggingLevel.Verbose);
}
});
}
// Get new SAS Token
var deviceConnectionString = await GetConnectionStringAsync();
// Create DeviceClient. Application uses DeviceClient for telemetry messages, device twin
// as well as device management
_deviceClient = DeviceClient.CreateFromConnectionString(deviceConnectionString, TransportType.Mqtt);
// For testing connection failure, we can use a short time-out.
// _deviceClient.OperationTimeoutInMilliseconds = 5000;
// IDeviceTwin abstracts away communication with the back-end.
// AzureIoTHubDeviceTwinProxy is an implementation of Azure IoT Hub
IDeviceTwin deviceTwin = new AzureIoTHubDeviceTwinProxy(_deviceClient, _iotHubOfflineEvent, Logger.Log);
// IDeviceManagementRequestHandler handles device management-specific requests to the app,
// such as whether it is OK to perform a reboot at any givem moment, according the app business logic
// ToasterDeviceManagementRequestHandler is the Toaster app implementation of the interface
IDeviceManagementRequestHandler appRequestHandler = new ToasterDeviceManagementRequestHandler(this);
// Create the DeviceManagementClient, the main entry point into device management
this.deviceManagementClient = await DeviceManagementClient.CreateAsync(deviceTwin, appRequestHandler);
await EnableDeviceManagementUiAsync(true);
// Set the callback for desired properties update. The callback will be invoked
// for all desired properties -- including those specific to device management
await _deviceClient.SetDesiredPropertyUpdateCallbackAsync(OnDesiredPropertyUpdated, null);
// Tell the deviceManagementClient to sync the device with the current desired state.
await this.deviceManagementClient.ApplyDesiredStateAsync();
Logger.Log("ResetConnectionAsync end", LoggingLevel.Verbose);
}
private async Task InitializeDeviceClientAsync()
{
// Create DeviceClient. Application uses DeviceClient for telemetry messages, device twin
// as well as device management
DeviceClient deviceClient = DeviceClient.CreateFromConnectionString(DeviceConnectionString, TransportType.Mqtt);
// IDeviceTwin abstracts away communication with the back-end.
// AzureIoTHubDeviceTwinProxy is an implementation of Azure IoT Hub
IDeviceTwin deviceTwinProxy = new AzureIoTHubDeviceTwinProxy(deviceClient);
// IDeviceManagementRequestHandler handles device management-specific requests to the app,
// such as whether it is OK to perform a reboot at any givem moment, according the app business logic
// ToasterDeviceManagementRequestHandler is the Toaster app implementation of the interface
IDeviceManagementRequestHandler appRequestHandler = new ToasterDeviceManagementRequestHandler(this);
// Create the DeviceManagementClient, the main entry point into device management
this.deviceManagementClient = await DeviceManagementClient.CreateAsync(deviceTwinProxy, appRequestHandler);
EnableDeviceManagementUI(true);
// Set the callback for desired properties update. The callback will be invoked
// for all desired properties -- including those specific to device management
await deviceClient.SetDesiredPropertyUpdateCallback(OnDesiredPropertyUpdate, null);
}
