BluetoothDemo/bluetooth_demo_H01/pages/index/index.js

const util = require("../../utils/util");
const {
  inArray,
  ab2hex
} = util
Page({
  data: {
    devices: [],
    connected: false,
    text: '',
    name: '',
    weight: "",
    height: "",
    imp: "",
    readId: "",
    writeId: "",
    notifyId: "",
    deviceId: null,
  },
  onLoad: function() {},
  // 初始化蓝牙模块
  openBluetoothAdapter() {
    wx.openBluetoothAdapter({
      success: (res) => {
        console.log('openBluetoothAdapter success', res)
        wx.showToast({
          title: '蓝牙连接中',
          icon: "none"
        })
        this.startBluetoothDevicesDiscovery()
      },
      fail: (res) => {
        if (res.errCode === 10001) {
          wx.showToast({
            title: '请打开蓝牙',
            icon: "none"
          })
          // 监听本机蓝牙状态变化的事件
          wx.onBluetoothAdapterStateChange((res) => {
            console.log('onBluetoothAdapterStateChange', res)
            if (res.available) {
              this.startBluetoothDevicesDiscovery()
            }
          })
        }
      }
    })
  },

  // 开始搜寻附近的蓝牙外围设备
  startBluetoothDevicesDiscovery() {
    if (this._discoveryStarted) {
      return
    }
    this._discoveryStarted = true
    wx.startBluetoothDevicesDiscovery({
      allowDuplicatesKey: true,
      interval: 500, //上报设备的间隔
      success: (res) => {
        console.log('startBluetoothDevicesDiscovery success', res)
        this.onBluetoothDeviceFound()
      },
    })
  },
  // 停止搜寻附近的蓝牙外围设备
  stopBluetoothDevicesDiscovery() {
    wx.stopBluetoothDevicesDiscovery()
  },

  // 找到新设备的事件
  onBluetoothDeviceFound() {
    wx.onBluetoothDeviceFound((res) => {
      res.devices.forEach(device => {
        if (!device.name && !device.localName) {
          return
        }
        if (device.name.indexOf('My') != -1) {
          wx.stopBluetoothDevicesDiscovery() //搜索到名称为“AiLink_”的蓝牙后，停止搜寻附近的蓝牙
          const foundDevices = this.data.devices
          const idx = inArray(foundDevices, 'deviceId', device.deviceId)
          const data = {}
          let buff = device.advertisData.slice(-6)
          device.mac = new Uint8Array(buff) // 保存广播数据中的mac地址，这是由于iOS不直接返回mac地址
          let tempMac = Array.from(device.mac)
          device.macAddr = ab2hex(tempMac, ':').toUpperCase()
          if (idx === -1) {
            data[`devices[${foundDevices.length}]`] = device
          } else {
            data[`devices[${idx}]`] = device
          }
          this.setData(data)
        }
      })
    })
  },
  // 连接低功耗蓝牙设备
  createBLEConnection(e) {
    wx.showLoading({
      title: '连接中',
    })
    const ds = e.currentTarget.dataset
    const index = ds.index
    this._device = this.data.devices[index]
    const deviceId = ds.deviceId
    const name = ds.name
    this.mac = ds.mac
    wx.createBLEConnection({
      deviceId,
      success: (res) => {
        this.setData({
          connected: true,
          name,
          deviceId,
        })
        console.log("createBLEConnection:success")
        this.onBLEConnectionStateChange()
        this.getBLEDeviceServices(deviceId)
      },
      fail: res => {
        wx.hideLoading()
        wx.showToast({
          title: '连接失败',
          icon: 'none'
        })
      }
    })
  },
  //监听蓝牙连接状态
  onBLEConnectionStateChange() {
    wx.onBLEConnectionStateChange((res) => {
      if (!res.connected) {
        setTimeout(() => {
          wx.showToast({
            title: '连接已断开',
            icon: 'none'
          })
        }, 500)
        this.setData({
          connected: false,
          devices: [],
          weight: "",
          height: "",
          text: "",
          imp: ""
        })
      }
    })
  },

  // 获取蓝牙设备的 serviceId
  getBLEDeviceServices(deviceId) {
    wx.getBLEDeviceServices({
      deviceId,
      success: (res) => {
        for (let i = 0; i < res.services.length; i++) {
          if (res.services[i].uuid.indexOf('FFE0') > -1) {
            wx.showLoading({
              title: '获取设备的UUID成功',
            })
            this.getBLEDeviceCharacteristics(deviceId, res.services[i].uuid)
            return
          }
        }
      }
    })
  },

  // 获取蓝牙设备某个服务中所有特征值(characteristic)
  /**
   * read: true读,write: true写,notify: true广播
   */
  getBLEDeviceCharacteristics(deviceId, serviceId) {
    let that = this
    that._deviceId = deviceId
    that._serviceId = serviceId
    that._device.serviceId = serviceId
    wx.hideLoading()
    wx.getBLEDeviceCharacteristics({
      deviceId,
      serviceId,
      success: (res) => {
        console.log('getBLEDeviceCharacteristics success', res.characteristics)
        that.setData({
          text: "请站在秤上，开始测量"
        })
        for (let i = 0; i < res.characteristics.length; i++) {
          let item = res.characteristics[i];
          if (item.uuid.indexOf("FFE1") != -1) {
            if (item.properties.notify == true) {
              that.data.notifyId = item.uuid
            }
            if (item.properties.read) {
              that.data.readId = item.uuid
            }
            if (item.properties.write == true) {
              that.data.writeId = item.uuid
            }
          }
        }

        // 打开监听
        wx.notifyBLECharacteristicValueChange({
          deviceId,
          serviceId,
          characteristicId: that.data.notifyId,
          state: true,
        })
        wx.notifyBLECharacteristicValueChange({
          deviceId,
          serviceId,
          characteristicId: that.data.writeId,
          state: true,
        })

        wx.onBLECharacteristicValueChange((res) => {
          let value = ab2hex(res.value, '');
          let weight = parseInt(value.substring(4, 8), 16) / 100
          let height = parseInt(value.substring(30, 34), 16) / 10
          let imp0 = value.substring(28, 30) + value.substring(34, 36)
          that.setData({
            weight: "您的体重是：" + weight + 'kg'
          })
          that.setData({
            height: "您的身高是：" + height + 'kg'
          })
          that.setData({
            imp: "阻抗：" + parseInt(imp0, 16)
          })
          that.setData({
            text: "测量结束"
          })
        })
      },
      fail(res) {
        console.error('getBLEDeviceCharacteristics', res)
      }
    })
  },

  /**
   * 断开蓝牙模块
   */
  closeBluetoothAdapter() {
    wx.closeBluetoothAdapter()
    this._discoveryStarted = false
    wx.showToast({
      title: '断开蓝牙模块',
      icon: 'none'
    })
    this.setData({
      devices: [],
      weight: "",
      height: "",
      imp: ""
    })
  },
  // 断开与低功耗蓝牙设备的连接
  closeBLEConnection() {
    wx.closeBLEConnection({
      deviceId: this._deviceId
    })
    wx.showToast({
      title: '断开蓝牙连接',
      icon: 'none'
    })
    this.setData({
      connected: false,
      devices: [],
      height: "",
      weight: "",
      imp: ""
    })
  },

});