/// <summary>
/// Once a response is received, check if that has block option set.
/// If yes, server has responded back. Ensure you check the more flag.
/// If that falg was set in the response, that means, server is still
/// getting the data that you sent in the previous PUT request. So wait
/// for a final ACK
/// </summary>
/// <param name="coapResp">CoAPResponse</param>
private static void OnCoAPResponseReceived(CoAPResponse coapResp)
{
if (coapResp.MessageType.Value == CoAPMessageType.ACK)
{
CoAPBlockOption returnedBlockOption = coapResp.GetBlockOption(CoAPHeaderOption.BLOCK1);
if (returnedBlockOption != null && !returnedBlockOption.HasMoreBlocks)
{
//send the next block
_blockSeqNo++;
if (HasDataToSend())
{
TransferToServerInBlocks();
}
}
}
}
/// <summary>
/// This is where we will get the PUT request
/// </summary>
/// <param name="coapReq">CoAPRequest</param>
static void OnCoAPRequestReceived(CoAPRequest coapReq)
{
string path = coapReq.GetPath();
/*Error checking not done to simplify example*/
if (coapReq.MessageType.Value == CoAPMessageType.CON &&
coapReq.Code.Value == CoAPMessageCode.PUT &&
path == "largedata/blockput")
{
if (_rxBytes == null)
{
_rxBytes = new Hashtable();
}
CoAPBlockOption rxBlockOption = coapReq.GetBlockOption(CoAPHeaderOption.BLOCK1);
if (rxBlockOption != null)
{
byte[] rxBytes = coapReq.Payload.Value;
if (_rxBytes.Contains(rxBlockOption.SequenceNumber))
{
_rxBytes[rxBlockOption.SequenceNumber] = rxBytes;//Update
}
else
{
_rxBytes.Add(rxBlockOption.SequenceNumber, rxBytes);//Add
}
//Now send an ACK
CoAPBlockOption ackBlockOption = new CoAPBlockOption(rxBlockOption.SequenceNumber,
false /*incidate to client that we have guzzled all the bytes*/,
rxBlockOption.SizeExponent);
CoAPResponse resp = new CoAPResponse(CoAPMessageType.ACK, CoAPMessageCode.CONTENT, coapReq.ID.Value);
resp.Token = coapReq.Token;
resp.RemoteSender = coapReq.RemoteSender;
resp.SetBlockOption(CoAPHeaderOption.BLOCK1, ackBlockOption);
_server.Send(resp);
}
}
}
