QtCoap

Constrained Application Protocol (CoAP) library written in Qt.

The QtCoap lib allowes you communicate with a CoAP server according to the RFC7252 standard.

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Lib features

• Queue for nonblocking multiple requests (FIFO) for each host
• DNS resolving for URLs
• GET, PUT, POST, DELETE methods
• Piggybacked requests
• Separated requests (async)
• Non-confirmable requests
• Extended option delta/lenght
• Blockwise transfers draft-ietf-core-block-19
• Observing resources RFC7641
• Combining Observe and Block2
• CoRE (Constrained RESTful Environments) link format parser RFC6690
• Tests using the online CoAP server coap://coap.me/ and coap://vs0.inf.ethz.ch/

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The coap-cli tool

$ coap-cli --help

Usage: ./coap-cli [options] [method] url

coap-cli is a command line tool which allowes to interact with a CoAP server.
Version: 1.0.0
Copyright © 2016 Simon Stürz <[email protected]>
Released under the GNU GENERAL PUBLIC LICENSE Version 3.

Options:
  -h, --help               Displays this help.
  -p, --payload <payload>  The payload data you want to send.
  -o, --observe            Observe the given resource.
  -d, --discover           Discover the resources of the server.
  -v, --verbose            Print the whole communication process.

Arguments:
  method                   Method you want to use. Possible values are:
                              get (default)
                              put
                              post
                              delete
  url                      URL of the CoAP resource.

Examples

• Discover a resource:

    $ coap-cli -d coap://vs0.inf.ethz.ch
  

• GET

    $ coap-cli get coap://vs0.inf.ethz.ch
  

  Alternative: $ coap-cli coap://vs0.inf.ethz.ch

• POST

    $ coap-cli post coap://vs0.inf.ethz.ch/test -p "Hello world!"
  

• PUT

    $ coap-cli put coap://vs0.inf.ethz.ch/test -p "Hello world!"
  

• DELETE

    $ coap-cli delete coap://vs0.inf.ethz.ch/test
  

• Observe

    $ coap-cli --observe coap://vs0.inf.ethz.ch/obs
  

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Use QtCoap in your project

Using the libqtcoap

You can checkout the coapclient.pro file or the coaptests.pro to see how the lib will be included into your project:

    LIBS += -L/path/to/the/lib/libqtcoap/ -lqtcoap
    INCLUDEPATH += /path/to/this/repository/coap

Using the coap.pri (like coap-cli)

You can copy the coap folder into your Qt project structure and include the coap.pri file in your project file:

    include(coap/coap.pri)

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Example

This example shows you the basic usage of the QtCoap lib:

#include "coapnetworkaccessmanager.h"

MyClass::MyClass(QObject *parent) : 
  QObject(parent)
{
  CoapNetworkAccessManager *coap = new CoapNetworkAccessManager(this);
  connect(m_coap, SIGNAL(replyFinished(CoapReply*)), this, SLOT(onReplyFinished(CoapReply*)));

  CoapRequest request(QUrl("coap://coap.me/hello"));
  coap->get(request);
}

void MyClass::onReplyFinished(CoapReply *reply)
{
  if (reply->error() != CoapReply::NoError) {
    qWarning() << "Reply finished with error" << reply->errorString();
  }
  
  qDebug() << "Reply finished" << reply;
  reply->deleteLater();
}

For more examples please checkout the coaptests and the coap-cli source code. There is a test case for almost every resource on coap://coap.me/ and observing on coap://vs0.inf.ethz.ch/.

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License

QtCoap is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 3 of the License.

You should have received a copy of the GNU General Public License along with QtCoap. If not, see http://www.gnu.org/licenses/.