WebSockets MQTT Subscription Example

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#include "clientsubscription.h" #include <QtCore/QCoreApplication> #include <QtCore/QCommandLineParser> #include <QtCore/QLoggingCategory> int main(int argc, char *argv[]) { QCoreApplication a(argc, argv); QCoreApplication::setApplicationVersion("1.0"); QCommandLineParser parser; parser.setApplicationDescription(QLatin1String("Websocket MQTT subscription tool")); auto help = parser.addHelpOption(); // Use http://www.hivemq.com/demos/websocket-client/ in browser to publish QCommandLineOption urlOption(QStringList() << "host" << "url" << "broker", QStringLiteral("Host to connect to, eg ws://broker.hivemq.com:8000/mqtt"), "host"); parser.addOption(urlOption); QCommandLineOption subscriptionOption(QStringList() << "t" << "topic", QStringLiteral("Topic to subscribe to"), "topic"); parser.addOption(subscriptionOption); QCommandLineOption debugOption(QStringList() << "d" << "debug", QStringLiteral("Enable Debug mode")); parser.addOption(debugOption); QCommandLineOption versionOption(QStringList() << "v" << "version", QStringLiteral("MQTT protocol version.\n3: MQTT 3.1\n4: MQTT 3.1.1"), "version", "3"); parser.addOption(versionOption); parser.process(a.arguments()); const QString debugLog = QString::fromLatin1("qtdemo.websocket.mqtt*=%1").arg( parser.isSet(debugOption) ? "true" : "false"); QLoggingCategory::setFilterRules(debugLog); ClientSubscription clientsub; clientsub.setUrl(QUrl(parser.value(urlOption))); clientsub.setTopic(parser.value(subscriptionOption)); const QString versionString = parser.value(versionOption); if (versionString == "4") { clientsub.setVersion(4); } else if (versionString == "3") { clientsub.setVersion(3); } else { qInfo() << "Unknown MQTT version"; return -2; } clientsub.connectAndSubscribe(); return a.exec(); }