code: def add_latlon(self, lat, lon):
          '''add a point via latitude/longitude'''
          p = mavutil.mavlink.MAVLink_fence_point_message(self.target_system, self.target_component,
                                                          self.count(), 0, lat, lon)
          self.add(pf add_latlon(self, lat, lon):
          '''add a point via latitude/longitude'''
          p = mavutil.mavlink.MAVLink_fence_point_message(self.target_system, self.target_component,
                                                          self.count(), 0, lat, lon)
          self.add(p)
docs: add a point via latitude/longitude