FreeCAD. Covert file on server

# -*- coding: utf-8 -*-

import FreeCAD
import Mesh
import Import

App.newDocument("Unnamed")
#App.setActiveDocument("Unnamed")
#App.ActiveDocument=App.getDocument("Unnamed")
#Gui.ActiveDocument=Gui.getDocument("Unnamed")
#Gui.activeDocument().activeView().viewDefaultOrientation()
Import.insert(u"/home/user/Projects/FreeCAD/file.stp","Unnamed")
#Gui.SendMsgToActiveView("ViewFit")
__objs__=[]
__objs__.append(FreeCAD.getDocument("Unnamed").getObject("Part__Feature"))
Mesh.export(__objs__,u"/home/user/Projects/FreeCAD/file.stl")

del __objs__