async Task SendMessageAsync(IChannelHandlerContext context, Message message)
{
string topicName = string.Format(TelemetryTopicFormat, this.deviceId);
PublishPacket packet = await Util.ComposePublishPacketAsync(context, message, this.mqttTransportSettings.PublishToServerQoS, topicName);
var publishCompletion = new TaskCompletionSource();
var workItem = new PublishWorkItem
{
Completion = publishCompletion,
Value = packet
};
switch (this.mqttTransportSettings.PublishToServerQoS)
{
case QualityOfService.AtMostOnce:
this.serviceBoundOneWayProcessor.Post(context, workItem);
break;
case QualityOfService.AtLeastOnce:
this.serviceBoundTwoWayProcessor.Post(context, workItem);
break;
default:
throw new NotSupportedException($"Unsupported telemetry QoS: '{this.mqttTransportSettings.PublishToServerQoS}'");
}
await publishCompletion.Task;
}
async Task SendMessageToServerAsync(IChannelHandlerContext context, PublishWorkItem publish)
{
if (!this.IsInState(StateFlags.Connected))
{
publish.Completion.TrySetCanceled();
}
try
{
await Util.WriteMessageAsync(context, publish.Value, ShutdownOnWriteErrorHandler);
if (publish.Value.QualityOfService == QualityOfService.AtMostOnce)
{
publish.Completion.TryComplete();
}
}
catch (Exception ex)
{
publish.Completion.TrySetException(ex);
}
}
Task ProcessAckAsync(IChannelHandlerContext context, PublishWorkItem publish)
{
publish.Completion.Complete();
return TaskConstants.Completed;
}
