初始化蓝牙，扫描蓝牙设备，蓝牙和手机建立链接，获取serviceid和characteristicid

写入value 0 进入dfu模式时， 此时小程序写入API返回错误，及错误详细信息（已确认比对serviceID 和characteristicid，完全正确）

wx.writeBLECharacteristicValue({
					deviceId: that.deviceid,
					serviceId: "1D14D6EE-FD63-4FA1-BFA4-8F47B42119F0",
					characteristicId: "F7BF3564-FB6D-4E53-88A4-5E37E0326063",
					value: valueBuffer,
					success: res => {
						console.log('启用DFU成功', res);
					},
					fail: err => {
						console.log('deviceid:'+that.deviceid)
						console.log(err);
					}
				});