// Example 1: Check whether the connection is available QDBusConnection connection = QDBusConnection::sessionBus(); if (connection.isConnected()) qDebug() << "D-Bus connection is available"; else qDebug() << "D-Bus connection is not available"; // Example 2: If connection is not available, wait for it to become available QDBusConnection connection = QDBusConnection::sessionBus(); while (!connection.isConnected()) { qDebug() << "Waiting for D-Bus connection..."; sleep(1); } qDebug() << "D-Bus connection is now available";The `QDBusConnection::isConnected` method is part of the QtDBus module library in the Qt framework.