问CoAP响应不包含远程发送方的定义。

EN

/// <summary>
/// Called when a request is received
/// </summary>
/// <param name="coapReq">The CoAPRequest object</param>
void OnCoAPRequestReceived(CoAPRequest coapReq)
{
    //This sample only works on NON requests of type GET
    //This sample simualtes a temperature sensor at the path "sensors/temp"

    string reqURIPath = (coapReq.GetPath() != null) ? coapReq.GetPath    ().ToLower() : "";
/**
        * Draft 18 of the specification, section 5.2.3 states, that if     against a NON message,
        * a response is required, then it must be sent as a NON message
        */
    if (coapReq.MessageType.Value != CoAPMessageType.NON)
    {
        //only NON  combination supported..we do not understand this send a RST back
        CoAPResponse msgTypeNotSupported = new CoAPResponse    (CoAPMessageType.RST, /*Message type*/
                                                            CoAPMessageCode.NOT_IMPLEMENTED, /*Not implemented*/
                                                            coapReq.ID.Value /*copy message Id*/);
        msgTypeNotSupported.Token = coapReq.Token; //Always match the     request/response token
        msgTypeNotSupported.RemoteSender = coapReq.RemoteSender;
        //send response to client
        this._coapServer.Send(msgTypeNotSupported);
    }
    else if (coapReq.Code.Value != CoAPMessageCode.GET)
    {
        //only GET method supported..we do not understand this send a RST back
        CoAPResponse unsupportedCType = new CoAPResponse    (CoAPMessageType.RST, /*Message type*/
                                        CoAPMessageCode.METHOD_NOT_ALLOWED, /*Method not allowed*/
                                        coapReq.ID.Value /*copy message Id*/);
        unsupportedCType.Token = coapReq.Token; //Always match the request/response token
        unsupportedCType.RemoteSender = coapReq.RemoteSender;
        //send response to client
        this._coapServer.Send(unsupportedCType);
}
    else if (reqURIPath != "sensors/temp")
{
        //classic 404 not found..we do not understand this send a RST back 
        CoAPResponse unsupportedPath = new CoAPResponse    (CoAPMessageType.RST, /*Message type*/
                                            CoAPMessageCode.NOT_FOUND, /*Not found*/
                                            coapReq.ID.Value /*copy message Id*/);
        unsupportedPath.Token = coapReq.Token; //Always match the     request/response token
        unsupportedPath.RemoteSender = coapReq.RemoteSender;
        //send response to client
        this._coapServer.Send(unsupportedPath);
    }
    else
    {
        //All is well...send the measured temperature back
    //Again, this is a NON message...we will send this message as a JSON
    //string
    Hashtable valuesForJSON = new Hashtable();
    valuesForJSON.Add("temp", this.GetRoomTemperature());
    string tempAsJSON = JSONResult.ToJSON(valuesForJSON);
    //Now prepare the object
    CoAPResponse measuredTemp = new CoAPResponse(CoAPMessageType.NON, /*Message type*/
                                        CoAPMessageCode.CONTENT, /*Carries content*/
                                        coapReq.ID.Value/*copy message Id*/);
    measuredTemp.Token = coapReq.Token; //Always match the request/response token
    //Add the payload
    measuredTemp.Payload = new CoAPPayload(tempAsJSON);
    //Indicate the content-type of the payload
    measuredTemp.AddOption(CoAPHeaderOption.CONTENT_FORMAT,
                        AbstractByteUtils.GetBytes(CoAPContentFormatOption.APPLICATION_JSON));
    //Add remote sender address details
    measuredTemp.RemoteSender = coapReq.RemoteSender;
    //send response to client
    this._coapServer.Send(measuredTemp);
}
}