Sculpt brush operator

Hi, i’m working on an add-on for blender thats allow you interact with the Leap Motion in many ways. One of those is to use the controller in sculpt mode, but when i try to pass the coordinates to the brush stroke no errors result, but nothing happens. I’ve already read this 2 post:

i use Blender 2.78, and this is part of my code:

view_align = (VU.rotate_vector(fing_pos, view.view_rotation))*40 
leap_pointer.location = view_align + leap_pointer.location

stroke = [{ "name": "stroke1",
                "mouse" : (0.0, 0.0),
                "pen_flip" : False,
                "is_start": True,
                "location": leap_pointer.location,
                "pressure": 1.0,
                "time": 1.0,
                "size":35
                },
                
               {"name" : "stroke2",
                "mouse" : (0.0, 0.0),
                "pen_flip" : False,
                "is_start" : False,
                "location": leap_pointer.location,
                "mouse": (0.0, 0.0),
                "pressure":1.0,
                "time":1.0,
                "size":35
                }]

bpy.ops.sculpt.brush_stroke(overrider, stroke=stroke, mode=‘NORMAL’)

Do you have any kind of advice?