public async Task SendAsync(ArraySegment <byte> buffer, CancellationToken cancellationToken)
{
try
{
_logger.Trace(nameof(CoapTransportLayerAdapter), $"Sending {buffer.Count} bytes...");
await _transportLayer.SendAsync(buffer, cancellationToken).ConfigureAwait(false);
}
catch (Exception exception)
{
throw new CoapCommunicationException("Error while sending CoAP message.", exception);
}
}
async Task ReceiveMessages(CancellationToken cancellationToken)
{
while (!cancellationToken.IsCancellationRequested)
{
try
{
var message = await _lowLevelClient.ReceiveAsync(cancellationToken).ConfigureAwait(false);
if (cancellationToken.IsCancellationRequested)
{
return;
}
if (message == null)
{
continue;
}
if (!_messageDispatcher.TryHandleReceivedMessage(message))
{
if (!await _observationManager.TryHandleReceivedMessage(message).ConfigureAwait(false))
{
_logger.Trace(nameof(CoapClient), "Received an unexpected message ({0}).", message.Id);
}
}
}
catch (OperationCanceledException)
{
}
catch (Exception exception)
{
_logger.Error(nameof(CoapClient), exception, "Error while receiving messages.");
}
}
}
public async Task <ArraySegment <byte> > ReceiveFullPayload(CancellationToken cancellationToken)
{
var receivedBlock2Option = _firstResponseMessage.Options.First(o => o.Number == CoapMessageOptionNumber.Block2);
var receivedBlock2OptionValue = _blockValueDecoder.Decode(((CoapMessageOptionUintValue)receivedBlock2Option.Value).Value);
_logger.Trace(nameof(CoapClientBlockTransferReceiver), "Received Block2 {0}.", FormatBlock2OptionValue(receivedBlock2OptionValue));
var requestMessage = new CoapMessage
{
Type = CoapMessageType.Confirmable,
Code = _requestMessage.Code,
Token = _requestMessage.Token,
Options = new List <CoapMessageOption>(_requestMessage.Options)
};
var requestBlock2Option = new CoapMessageOption(CoapMessageOptionNumber.Block2, new CoapMessageOptionUintValue(0));
requestMessage.Options.Add(requestBlock2Option);
// Crate a buffer which is pre sized to at least 4 blocks.
using (var buffer = new MemoryBuffer(receivedBlock2OptionValue.Size * 4))
{
buffer.Write(_firstResponseMessage.Payload);
while (receivedBlock2OptionValue.HasFollowingBlocks)
{
// Patch Block1 so that we get the next chunk.
// TODO: Move custom size to client connect options!
//receivedBlock2OptionValue.Size = 1024;
receivedBlock2OptionValue.Number++;
// TODO: Avoid setting value. Create new instead.
requestBlock2Option.Value = new CoapMessageOptionUintValue(_blockValueEncoder.Encode(receivedBlock2OptionValue));
var response = await _client.RequestAsync(requestMessage, cancellationToken).ConfigureAwait(false);
receivedBlock2Option = response.Options.First(o => o.Number == CoapMessageOptionNumber.Block2);
receivedBlock2OptionValue = _blockValueDecoder.Decode(((CoapMessageOptionUintValue)receivedBlock2Option.Value).Value);
_logger.Trace(nameof(CoapClientBlockTransferReceiver), "Received Block2 {0}.", FormatBlock2OptionValue(receivedBlock2OptionValue));
buffer.Write(response.Payload);
}
return(buffer.GetBuffer());
}
}
