@planning_entity
class Device:
    def __init__(self, id, node, controller):
        self.id = id
        self.node = node
        self.controller = controller

    @planning_id
    def get_id(self):
        return self.id

    def get_node():
        return node

    @planning_variable(Controller, ["controller_range"])
    def get_controller():
        return controller

    def set_controller(new_ctr):
        self.controller = new_ctr

@planning_entity
class Controller:
    def __init__(self, id, node, dev_list=None):
        self.id = id
        self.node = node
        if dev_list is None:
            self.dev_list = []
        else:
            self.dev_list = dev_list

    @planning_id
    def get_id(self):
        return self.id

    def get_node():
        return node

    @inverse_relation_shadow_variable(Controller, source_variable_name = "controller")
    def get_dev_list():
        return dev_list

    def set_dev_list(new_list):
        self.dev_list = new_list