Quick Secure CoAP Client Example

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#include "qmlcoapsecureclient.h" #include <QCoapReply> #include <QFile> #include <QLoggingCategory> #include <QMetaEnum> #include <QUrl> Q_LOGGING_CATEGORY(lcCoapClient, "qt.coap.client") QmlCoapSecureClient::QmlCoapSecureClient(QObject *parent) : QObject(parent) , m_coapClient(nullptr) , m_securityMode(QtCoap::SecurityMode::NoSecurity) { } QmlCoapSecureClient::~QmlCoapSecureClient() { if (m_coapClient) { delete m_coapClient; m_coapClient = nullptr; } } static QString errorMessage(QtCoap::Error errorCode) { const auto error = QMetaEnum::fromType<QtCoap::Error>().valueToKey(static_cast<int>(errorCode)); return QString("Request failed with error: %1\n").arg(error); } void QmlCoapSecureClient::setSecurityMode(QtCoap::SecurityMode mode) { // Create a new client, if the security mode has changed if (m_coapClient && mode != m_securityMode) { delete m_coapClient; m_coapClient = nullptr; } if (!m_coapClient) { m_coapClient = new QCoapClient(mode); m_securityMode = mode; connect(m_coapClient, &QCoapClient::finished, this, [this](QCoapReply *reply) { if (!reply) emit finished("Something went wrong, received a null reply"); else if (reply->errorReceived() != QtCoap::Error::Ok) emit finished(errorMessage(reply->errorReceived())); else emit finished(reply->message().payload()); }); connect(m_coapClient, &QCoapClient::error, this, [this](QCoapReply *, QtCoap::Error errorCode) { emit finished(errorMessage(errorCode)); }); } } void QmlCoapSecureClient::sendGetRequest(const QString &host, const QString &path, int port) { if (!m_coapClient) return; m_coapClient->setSecurityConfiguration(m_configuration); QUrl url; url.setHost(host); url.setPath(path); url.setPort(port); m_coapClient->get(url); } void QmlCoapSecureClient::setSecurityConfiguration(const QString &preSharedKey, const QString &identity) { QCoapSecurityConfiguration configuration; configuration.setPreSharedKey(preSharedKey.toUtf8()); configuration.setPreSharedKeyIdentity(identity.toUtf8()); m_configuration = configuration; } void QmlCoapSecureClient::setSecurityConfiguration(const QString &localCertificatePath, const QString &caCertificatePath, const QString &privateKeyPath) { QCoapSecurityConfiguration configuration; const auto localCerts = QSslCertificate::fromPath(QUrl(localCertificatePath).toLocalFile(), QSsl::Pem, QSslCertificate::PatternSyntax::FixedString); if (localCerts.isEmpty()) qCWarning(lcCoapClient, "The specified local certificate file is not valid."); else configuration.setLocalCertificateChain(localCerts.toVector()); const auto caCerts = QSslCertificate::fromPath(QUrl(caCertificatePath).toLocalFile(), QSsl::Pem, QSslCertificate::PatternSyntax::FixedString); if (caCerts.isEmpty()) qCWarning(lcCoapClient, "The specified CA certificate file is not valid."); else configuration.setCaCertificates(caCerts.toVector()); QFile privateKey(QUrl(privateKeyPath).toLocalFile()); if (privateKey.open(QIODevice::ReadOnly)) { QCoapPrivateKey key(privateKey.readAll(), QSsl::Ec); configuration.setPrivateKey(key); } else { qCWarning(lcCoapClient) << "Unable to read the specified private key file" << privateKeyPath; } m_configuration = configuration; } void QmlCoapSecureClient::disconnect() { if (m_coapClient) m_coapClient->disconnect(); }