I’m building a desktop application in Qt creator using Qt quick, where most of the coding is done in QML. My app consists of a Map with some functions. I’m using OpenStreetMap plugin for my map, but the minimumZoomLevel (3) and maximumZoomLevel (25) doesn’t get set, have anyone experienced something similar? Is there a min or max for these values?
OSM doesn’t have zoom levels; it is a vector map database. Either your plugin is arbitrarily imposing zoom levels on that vector data or it is using bitmap tiles.
The bitmap tiles are subject to fair usage restrictions, as they are provided for mappers, not for end users, but they should not need any special plugin as they are standard sllippy map tiles and any slippy map plugin should work, provided it is given the right rules for tile names. (Although not relevant to your issue, have you checked that your usage comes within the fair usage limits?)
The standard rendering tiles (the ones actually provided by the OSM itself, rather than third parties, have a maximum zoom of 19, although the the minimum zoom does seem to be 0, unless that is synthesized in the web interface.