public async Task CloseAsync()
{
if (_sendLoop != null)
{
_cts.Cancel();
await _sendLoop;
_sendLoop = null;
_cts.Dispose();
_cts = null;
}
await _deviceClient.CloseAsync();
StateCollection <DeviceClientState> .Remove(_device.DeviceID);
}
private async Task SendLoop(CancellationToken ct)
{
bool isDeviceClientAvailable = true;
StateCollection <DeviceClientState> .Set(_device.DeviceID, DeviceClientState.Up);
while (!ct.IsCancellationRequested)
{
await Task.Delay(TimeSpan.FromSeconds(1));
// Re-create device client if it is not available (due to any exception)
if (!isDeviceClientAvailable)
{
try
{
_deviceClient?.Dispose();
_deviceClient = null; // Avoid duplicated disposing the old device client, if the new one failed to be created
_deviceClient = await CreateDeviceClient();
_logger.LogInfo($"Transport opened for device {_device.DeviceID} with type {_transportType}");
isDeviceClientAvailable = true;
StateCollection <DeviceClientState> .Set(_device.DeviceID, DeviceClientState.Up);
}
catch (Exception ex)
{
_logger.LogError($"Exception raised while trying to open transport for device {_device.DeviceID}: {ex}");
continue;
}
}
if (_reports.Any())
{
try
{
await _deviceClient.UpdateReportedPropertiesAsync(_reports.First.Value);
lock (_reports)
{
_reports.RemoveFirst();
}
}
catch (Exception ex)
{
_logger.LogError($"Exception raised while device {_device.DeviceID} trying to update reported properties: {ex}");
isDeviceClientAvailable = false;
StateCollection <DeviceClientState> .Set(_device.DeviceID, DeviceClientState.Down);
continue;
}
}
if (_messages.Any())
{
// Messages failed to be sent will be dropped
var sendingMessages = new List <Client.Message>();
lock (_messages)
{
sendingMessages.AddRange(_messages);
_messages.Clear();
}
try
{
await _deviceClient.SendEventBatchAsync(sendingMessages);
}
catch (Exception ex)
{
_logger.LogError($"Exception raised while device {_device.DeviceID} trying to send events: {ex}");
isDeviceClientAvailable = false;
StateCollection <DeviceClientState> .Set(_device.DeviceID, DeviceClientState.Down);
continue;
}
}
}
}