pyqgis load dxf file as dxf file as a vector layer

Can somebody help me with load a dxf file as a vector layer with pyqgis?

Is QgsDataSourceURI an option? I tried with this code, but I haven't been lucky.

fitxer="/tmp/prova.dxf" uri = QgsDataSourceURI() uri.setDatabase(fitxer) uri.setDataSource('', 'entities', 'OGR_GEOMETRY', "OGR_GEOMETRY='POINT'", 'fid')

layer = QgsVectorLayer(uri.uri(), 'prova', 'ogr')

print 'isValid:', layer.isValid()

Thanks.