delay() {

    return new Promise((resolve, reject) => {

      setTimeout(() => {

        resolve()

      }, 20)

    })

  },

send(){

let sendData = “232319a954696d3a32302f31312f30332031353a30323a303392e4” //发送数据

    let buffer = string2buffer(sendData);

    let pos = 0;

    let bytes = buffer.byteLength;

    let result = ‘’

    while (bytes > 0) {

      let tmpBuffer;

      if (bytes > 20) {

        tmpBuffer = buffer.slice(pos, pos + 20);

        pos += 20;

        bytes -= 20;

        wx.writeBLECharacteristicValue({

          deviceId: this._deviceId,

          serviceId: this._serviceId,

          characteristicId: this._characteristicId,

          value: tmpBuffer,

          success(res) {

            console.log(‘发送成功！’, res)

          },

          fail: err => {

            console.log(err)

          }

        })

      } else {

        tmpBuffer = buffer.slice(pos, pos + bytes);

        pos += bytes;

        bytes -= bytes;

        wx.writeBLECharacteristicValue({

          deviceId: this._deviceId,

          serviceId: this._serviceId,

          characteristicId: this._characteristicId,

          value: tmpBuffer,

          success(res) {

            console.log(‘最后次发送’, res)

          },

          fail: function (res) {

            console.log(‘发送失败’, res)

          }

        })

      }

      await this.delay()

    }

}

在苹果11，输出2次发送成功，但是设备没有显示写入成功，间隔20毫秒发送一次，安卓小米8，输出2次发送成功，设备有显示时间已同步，但是只收到1次返回结果，看下面的协议Tim是完整的时间，怎么解决