BluetoothDemo/bluetooth_demo_L11/pages/index/index.js

const util = require("../../utils/util");
const {
  inArray,
  ab2hex
} = util

Page({
  data: {
    devices: [],
    deviceId: null,
    connected: false,
    weight: "",
    imp: "",
    tetx: ''
  },
  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, //是否允许重复上报同一设备
      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() {
    let that = this
    wx.onBluetoothDeviceFound((res) => {
      res.devices.forEach(device => {
        if (!device.name && !device.localName) {
          let value = ab2hex(device.advertisData, "")
          let id = value.substring(12, 16)
          if (value.indexOf('c0') !== -1 && id == '0002') {
            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()
            let msg = parseInt(value.substring(16, 18), 16).toString(2)
            let weight = parseInt(value.substring(4, 8), 16)//体重
            let type = msg.substring(5, 6) //0实时,1稳定
            let num = msg.substring(3, 5) //小数点
            let unit = msg.substring(1, 3) //单位
            let dw1 = "kg"
            if (unit == "10") {
              dw1 = "lb"
            }
            if (num == "00") {
              weight = parseInt(value.substring(4, 8), 16) / 10
            }
            if (num == "10") {
              if (unit == "10") {
                dw1 = "lb"
                weight = parseInt(value.substring(4, 8), 16) / 10
              } else {
                weight = parseInt(value.substring(4, 8), 16) / 100
              }
            }
            that.setData({
              weight: "实时体重：" + weight + dw1,
            })
            if (type == '1') {
              that.setData({
                weight: "稳定体重：" + weight + dw1,
                imp: "阻抗：" + parseInt(value.substring(8, 12), 16) / 10,
              })
            }
          }
          return
        }

      })
    })
  },
  //监听蓝牙连接状态
  onBLEConnectionStateChange() {
    wx.onBLEConnectionStateChange((res) => {
      if (!res.connected) {
        wx.stopBluetoothDevicesDiscovery();
        setTimeout(() => {
          wx.showToast({
            title: '连接已断开',
            icon: 'none'
          })
        }, 500)
        this.setData({
          connected: false,
          devices: [],
          weight: "",
          imp: "",
          text: ''

        })
      }
    })
  },

  /**
   * 断开蓝牙模块
   */
  closeBluetoothAdapter() {
    wx.stopBluetoothDevicesDiscovery();
    wx.closeBluetoothAdapter()
    this._discoveryStarted = false
    wx.showToast({
      title: '结束流程',
      icon: 'none'
    })
    this.setData({
      devices: [],
      weight: "",
      imp: "",
      text: ''
    })
  },
});