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我有一些 Pycom Wipy 3 板，我想通过使用 Pymesh BLE 创建蓝牙网格。我已经开始关注此链接中的传感器示例。

这是我创建 Pymesh BLE 服务器的代码：

from network import Bluetooth
from hardware.rgb_led import RGBLed
import time
from machine import Timer

class BluetoothMeshServer:

    bluetooth = None
    model_server = None
    ble_mesh = None

    def __init__(self):
        pass

    def start(self):
        BLE_Mesh = Bluetooth.BLE_Mesh

        # BLE Mesh module
        # self.ble_mesh = Bluetooth.BLE_Mesh.init(name="PYCOM-ESP-BLE-MESH", *, auth=0, callback=None)
        self.ble_mesh = Bluetooth.BLE_Mesh.init(name="xxx", auth=0, callback=None)

        # Need to turn ON Bluetooth before using BLE Mesh
        self.bluetooth = Bluetooth()

        # Create a Primary Element with GATT Proxy feature and add a Server model to the Element
        element = self.ble_mesh.create_element(primary=True, feature=self.ble_mesh.GATT_PROXY)
        self.model_server = element.add_model(self.ble_mesh.SENSOR, self.ble_mesh.SERVER, sen_min = 0, sen_max = 59, sen_res = 1)

        # Initialize self.ble_mesh
        self.ble_mesh.init("Pycom Sensor Server", callback=self.prov_callback)

        # Turn on Provisioning Advertisement
        self.ble_mesh.set_node_prov(self.ble_mesh.PROV_ADV|self.ble_mesh.PROV_GATT)

        # Sensor takes measurement every 1 second
        Timer.Alarm(self.read_sensor, 1, periodic=True)

        # Sensor send status every 5 seconds
        Timer.Alarm(self.status_sensor, 5, periodic=True)

    def read_sensor(self, alarm):
        # In this example sensor reads local seconds
        if(device_provisioned):
            self.model_server.set_state(time.localtime()[5])
            print("SENSOR | State: ", self.model_server.get_state())

    def status_sensor(self, alarm):
        if (device_provisioned):
            self.model_server.status_state()

    def prov_callback(self, event, oob_pass):
        global device_provisioned
        if(event == self.ble_mesh.PROV_REGISTER_EVT or event == self.ble_mesh.PROV_RESET_EVT):
            # Yellow if not Provision yet or Reset
            RGBLed.turn_yellow()
            device_provisioned = False
        if(event == self.ble_mesh.PROV_COMPLETE_EVT):
            # Green if Provisioned
            RGBLed.turn_green
            device_provisioned = True

我遇到的麻烦是这条线：

        BLE_Mesh = Bluetooth.BLE_Mesh

在终端中引发异常。这是终端的错误输出：

Traceback (most recent call last):
  File "main.py", line 11, in <module>
  File "lib/bluetooth_mesh_server.py", line 16, in start
AttributeError: type object 'Bluetooth' has no attribute 'BLE_Mesh'
Pycom MicroPython 1.20.2.r6 [v1.11-c5a0a97] on 2021-10-28; WiPy with ESP32
Pybytes Version: 1.7.1
Type "help()" for more information.

如您所见，错误显示“AttributeError：类型对象'Bluetooth'没有属性'BLE_Mesh'”。为什么？如何将 BLE_Mesh 与 Wipy 3 板一起使用来创建蓝牙网格？

谢谢！

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