测试低功耗蓝牙时一直报错

检查后发现

  wx.writeBLECharacteristicValue({
      deviceId: this._deviceId,
      serviceId: this._deviceId,
      characteristicId: this._characteristicId,
      value: buffer,
    })

其中的`serviceId`写成了`_deviceId`

修改后

    wx.writeBLECharacteristicValue({
      deviceId: this._deviceId,
      serviceId: this._serviceId,
      characteristicId: this._characteristicId,
      value: buffer,
    })