uniapp低功耗蓝牙写入文件

根据提供的引用内容，没有提到uniapp低功耗蓝牙写入文件的相关信息。但是，如果你想要在uniapp中使用低功耗蓝牙进行数据传输，可以按照以下步骤进行：

1.引入uni-ble库

import Ble from '@/common/uni-ble/uni-ble.js'

2.初始化蓝牙适配器

Ble.openAdapter({
  success: function(res) {
    console.log('openAdapter success', res)
  },
  fail: function(res) {
    console.log('openAdapter fail', res)
  }
})

3.搜索蓝牙设备

Ble.startBluetoothDevicesDiscovery({
  allowDuplicatesKey: false,
  success: function(res) {
    console.log('startBluetoothDevicesDiscovery success', res)
  },
  fail: function(res) {
    console.log('startBluetoothDevicesDiscovery fail', res)
  }
})

4.连接蓝牙设备

Ble.createBLEConnection({
  deviceId: deviceId,
  success: function(res) {
    console.log('createBLEConnection success', res)
  },
  fail: function(res) {
    console.log('createBLEConnection fail', res)
  }
})

5.写入数据

Ble.writeBLECharacteristicValue({
  deviceId: deviceId,
  serviceId: serviceId,
  characteristicId: characteristicId,
  value: buffer,
  success: function(res) {
    console.log('writeBLECharacteristicValue success', res)
  },
  fail: function(res) {
    console.log('writeBLECharacteristicValue fail', res)
  }
})

注意：在进行数据传输时，需要将数据转换为ArrayBuffer类型的数据，可以使用以下代码进行转换：

let buffer = new Uint8Array([0x01, 0x02, 0x03]).buffer