/// <summary>
/// Called when a CoAP request is received...we will only support CON requests
/// of type GET... the path is sensors/temp
/// </summary>
/// <param name="coapReq">CoAPRequest object</param>
private static void OnCoAPRequestReceived(CoAPRequest coapReq)
{
string reqPath = (coapReq.GetPath() != null) ? coapReq.GetPath().ToLower() : "";
if (coapReq.MessageType.Value == CoAPMessageType.CON)
{
if (coapReq.Code.Value != CoAPMessageCode.GET)
{
CoAPResponse resp = new CoAPResponse(CoAPMessageType.ACK,
CoAPMessageCode.METHOD_NOT_ALLOWED,
coapReq /*Copy all necessary values from request in the response*/);
//When you use the constructor that accepts a request, then automatically
//the message id , token and remote sender values are copied over to the response
coapServer.Send(resp);
}
else if (reqPath != "sensors/temp")
{
//We do not understand this..
CoAPResponse resp = new CoAPResponse(CoAPMessageType.ACK,
CoAPMessageCode.NOT_FOUND,
coapReq /*Copy all necessary values from request in the response*/);
coapServer.Send(resp);
}
else
{
Debug.WriteLine(coapReq.ToString());
CoAPResponse resp = new CoAPResponse(CoAPMessageType.ACK,
CoAPMessageCode.CONTENT,
coapReq /*Copy all necessary values from request in the response*/);
//The payload will be JSON
Hashtable ht = new Hashtable();
ht.Add("temp", GetRoomTemperature());
string jsonStr = JSONResult.ToJSON(ht);
resp.AddPayload(jsonStr);
//Tell recipient about the content-type of the response
resp.AddOption(CoAPHeaderOption.CONTENT_FORMAT, AbstractByteUtils.GetBytes(CoAPContentFormatOption.APPLICATION_JSON));
//send it
coapServer.Send(resp);
}
}
}
/// <summary>
/// Called when a CoAP request is received...we will only support CON requests
/// of type GET... the path is sensors/temp
/// </summary>
/// <param name="coapReq">CoAPRequest object</param>
static void OnCoAPRequestReceived(CoAPRequest coapReq)
{
string reqPath = (coapReq.GetPath() != null) ? coapReq.GetPath().ToLower() : "";
/*We have skipped error handling in code below to just focus on observe option*/
if (coapReq.MessageType.Value == CoAPMessageType.CON && coapReq.Code.Value == CoAPMessageCode.GET)
{
if (!coapReq.IsObservable() /*Does the request have "Observe" option*/)
{
/*Request is not to observe...we do not support anything no-observable*/
CoAPResponse resp = new CoAPResponse(CoAPMessageType.ACK,
CoAPMessageCode.NOT_IMPLEMENTED,
coapReq /*Copy all necessary values from request in the response*/);
coapServer.Send(resp);
}
else if (!coapServer.ObserversList.IsResourceBeingObserved(coapReq.GetURL()) /*do we support observation on this path*/)
{
//Observation is not supported on this path..just to tell you how to check
CoAPResponse resp = new CoAPResponse(CoAPMessageType.ACK,
CoAPMessageCode.NOT_FOUND,
coapReq /*Copy all necessary values from request in the response*/);
coapServer.Send(resp);
}
else
{
//This is a request to observe this resource...register this client
coapServer.ObserversList.AddResourceObserver(coapReq);
/*Request contains observe option and path is correct*/
CoAPResponse resp = new CoAPResponse(CoAPMessageType.ACK,
CoAPMessageCode.EMPTY,
coapReq /*Copy all necessary values from request in the response*/);
//send it..tell client we registered it's request to observe
coapServer.Send(resp);
}
}
}
/// <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);
}
}
}
/// <summary>
/// Called when a CoAP request is received (NON, CON)
/// </summary>
/// <param name="coapReq">CoAPRequest object</param>
private static void OnCoAPRequestReceived(CoAPRequest coapReq)
{
string reqPath = (coapReq.GetPath() != null) ? coapReq.GetPath().ToLower() : "";
/*
* For well-know path, we should support both CON and NON.
* For NON request, we send back the details in another NON message
* For CON request, we send back the details in an ACK
*/
/*Well known should be a GET*/
if (coapReq.Code.Value != CoAPMessageCode.GET)
{
if (coapReq.MessageType.Value == CoAPMessageType.CON)
{
CoAPResponse resp = new CoAPResponse(CoAPMessageType.ACK,
CoAPMessageCode.METHOD_NOT_ALLOWED,
coapReq /*Copy all necessary values from request in the response*/);
//When you use the constructor that accepts a request, then automatically
//the message id , token and remote sender values are copied over to the response
coapServer.Send(resp);
}
else
{
//For NON, we can only send back a RST
CoAPResponse resp = new CoAPResponse(CoAPMessageType.RST,
CoAPMessageCode.METHOD_NOT_ALLOWED,
coapReq /*Copy all necessary values from request in the response*/);
//When you use the constructor that accepts a request, then automatically
//the message id , token and remote sender values are copied over to the response
coapServer.Send(resp);
}
}
else
{
//Message type is GET...check the path..this server only supports well-known path
if (reqPath != ".well-known/core")
{
if (coapReq.MessageType.Value == CoAPMessageType.CON)
{
CoAPResponse resp = new CoAPResponse(CoAPMessageType.ACK,
CoAPMessageCode.NOT_FOUND,
coapReq /*Copy all necessary values from request in the response*/);
coapServer.Send(resp);
}
else
{
//For NON, we can only send back a RST
CoAPResponse resp = new CoAPResponse(CoAPMessageType.RST,
CoAPMessageCode.NOT_FOUND,
coapReq /*Copy all necessary values from request in the response*/);
coapServer.Send(resp);
}
}
else
{
//Request is GET and path is right
if (coapReq.MessageType.Value == CoAPMessageType.CON)
{
CoAPResponse resp = new CoAPResponse(CoAPMessageType.ACK,
CoAPMessageCode.CONTENT,
coapReq /*Copy all necessary values from request in the response*/);
//Add response payload
resp.AddPayload(GetSupportedResourceDescriptions());
//Tell recipient about the content-type of the response
resp.AddOption(CoAPHeaderOption.CONTENT_FORMAT, AbstractByteUtils.GetBytes(CoAPContentFormatOption.APPLICATION_LINK_FORMAT));
coapServer.Send(resp);
}
else
{
//Its a NON, send a NON back...in CoAPSharp, NON is always considered as request
CoAPResponse resp = new CoAPResponse(CoAPMessageType.NON,
CoAPMessageCode.CONTENT,
coapReq.ID.Value);
//Copy over other needed values from the reqeust
resp.Token = coapReq.Token;
resp.RemoteSender = coapReq.RemoteSender;
resp.AddPayload(GetSupportedResourceDescriptions());
//Tell recipient about the content-type of the response
resp.AddOption(CoAPHeaderOption.CONTENT_FORMAT, AbstractByteUtils.GetBytes(CoAPContentFormatOption.APPLICATION_LINK_FORMAT));
//send it
coapServer.Send(resp);
}
}
}
}
