Console CoAP Client Example | Qt CoAP 6.4.1

- Qt 6.4
- Qt CoAP
- Qt CoAP Examples
- Console CoAP Client Example
- Qt 6.4.1 Reference Documentation

# Console CoAP Client Example

     // Copyright (C) 2017 Witekio.
     // Copyright (C) 2018 The Qt Company Ltd.
     // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only

     #include "coaphandler.h"

     #include <QDebug>
     #include <QLoggingCategory>
     #include <QCoapClient>
     #include <QCoapReply>
     #include <QCoapResourceDiscoveryReply>

     Q_LOGGING_CATEGORY(lcCoapClient, "qt.coap.client")

     CoapHandler::CoapHandler(QObject *parent) : QObject(parent)
     {
         connect(&m_coapClient, &QCoapClient::finished, this, &CoapHandler::onFinished);
         connect(&m_coapClient, &QCoapClient::error, this, &CoapHandler::onError);
         connect(&m_coapClient, &QCoapClient::responseToMulticastReceived,
                 this, &CoapHandler::onResponseToMulticast);
     }

     bool CoapHandler::runGet(const QUrl &url)
     {
         return m_coapClient.get(url);
     }

     bool CoapHandler::runPost(const QUrl &url)
     {
         return m_coapClient.post(url);
     }

     bool CoapHandler::runPut(const QUrl &url)
     {
         return m_coapClient.put(url);
     }

     bool CoapHandler::runDelete(const QUrl &url)
     {
         return m_coapClient.deleteResource(url);
     }

     bool CoapHandler::runObserve(const QUrl &url)
     {
         QCoapReply *observeReply = m_coapClient.observe(url);
         if (!observeReply)
             return false;

         connect(observeReply, &QCoapReply::notified, this, &CoapHandler::onNotified);
         return true;
     }

     bool CoapHandler::runDiscover(const QUrl &url)
     {
         QCoapResourceDiscoveryReply *discoverReply = m_coapClient.discover(url);
         if (!discoverReply)
             return false;

         connect(discoverReply, &QCoapResourceDiscoveryReply::discovered, this, &CoapHandler::onDiscovered);
         return true;
     }

     void CoapHandler::onFinished(QCoapReply *reply)
     {
         if (reply->errorReceived() == QtCoap::Error::Ok)
             qCInfo(lcCoapClient) << "Request finished with payload:" << reply->readAll();
         else
             qCWarning(lcCoapClient, "Request failed");

         // Don't forget to remove the reply
         reply->deleteLater();
     }

     void CoapHandler::onNotified(QCoapReply *reply, QCoapMessage message)
     {
         Q_UNUSED(message)

         // You can alternatively use `message.payload();`
         qCInfo(lcCoapClient) << "Received Observe notification with payload:" << reply->readAll();
     }

     void CoapHandler::onDiscovered(QCoapResourceDiscoveryReply *reply, QList<QCoapResource> resources)
     {
         Q_UNUSED(reply)

         for (const QCoapResource &res : qAsConst(resources))
             qCInfo(lcCoapClient) << "Discovered resource:" << res.path() << res.title();
     }

     void CoapHandler::onResponseToMulticast(QCoapReply *reply, const QCoapMessage& message,
                                             const QHostAddress &sender)
     {
         if (reply->errorReceived() == QtCoap::Error::Ok)
             qCInfo(lcCoapClient) << "Got a response for multicast request from:" << sender.toString()
                                  << "with payload:" << message.payload();
         else
             qCWarning(lcCoapClient, "Multicast request failed");
     }

     void CoapHandler::onError(QCoapReply *reply, QtCoap::Error error)
     {
         if (reply)
             qCInfo(lcCoapClient) << "CoAP reply error:" << reply->errorString();
         else
             qCWarning(lcCoapClient) << "CoAP error:" << error;
     }