wx.writeBLECharacteristicValue({

        deviceId: that.data.connectedDeviceId,

        serviceId: app.BLEInformation.writeServiceId,

        characteristicId: app.BLEInformation.writeCharaterId,

        value: buffer,

        success: function (res) {

          console.log('发送成功')

        },

        fail:function(res){

          console.log(res)

        }

      })