蓝牙在小程序中的应用

            function
             connect(){
  wx.openBluetoothAdapter({
    success: 
            function
             (res) {
    },
    fail(res){
    },
    complete(res){
      wx.onBluetoothAdapterStateChange(
            function
            (res) {
        
            if
            (res.available){
          setTimeout(
            function
            (){
            connect();
          },1000);
        }
      })
　　　//开始搜索  
    }
  })
}

let mac = "XXXXXXXXXXXXXXX";
wx.startBluetoothDevicesDiscovery({
  services:[],
  success(res) {
    wx.onBluetoothDeviceFound(res=>{
        let devices = res.devices;
        for(let i = 0;i<devices.length;i++){
          if(devices[i].deviceId = mac){
            console.log("find");
            wx.stopBluetoothDevicesDiscovery({
              success:res=>console.log(res),
              fail:res=>console.log(res),
            })
          }
        }
    });
    
  },
  fail(res){
      console.log(res);
  }
})

let id = "XXXXXXXXXXXXXXX",//设备标识符
    deviceId = "";
wx.startBluetoothDevicesDiscovery({
  services:[],
  success(res) {
    wx.onBluetoothDeviceFound(res=>{
        var devices = res.devices;
        for(let i = 0;i<devices.length;i++){
          let advertisData = devices[i].advertisData;
          var data = arrayBufferToHexString(advertisData);//二进制转字符串
          if (!!data && data.indexOf(id) > -1) {
              console.log("find");
　　　　　　　　deviceId = devices[i].deviceId;
          }
        }
    });    
  },
  fail(res){
      console.log(res);
  }
});
function arrayBufferToHexString(buffer) {
  let bufferType = Object.prototype.toString.call(buffer)
  if (buffer != ‘[object ArrayBuffer]‘) {
    return
  }
  let dataView = new DataView(buffer)

  var hexStr = ‘‘;
  for (var i = 0; i < dataView.byteLength; i++) {
    var str = dataView.getUint8(i);
    var hex = (str & 0xff).toString(16);
    hex = (hex.length === 1) ? ‘0‘ + hex : hex;
    hexStr += hex;
  }

  return hexStr.toUpperCase();
}

let deviceId = "XXXX";
wx.getBLEDeviceServices({
  deviceId: device_id,
  success: function (res) {        
    let service_id = "";
    for(let i = 0;i<res.services.length;i++){
      if(services[i].uuid.toUpperCase().indexOf("TEST") != -1){
        service_id = services[i].uuid;
        break;
      }
    }

    return service_id;
  },
  fail(res){
    console.log(res);
  }
})

            wx.getBLEDeviceCharacteristics({
  deviceId: device_id,
  serviceId: service_id,
  success: 
            function
             (res) {
    let notify_id,write_id,read_id;
    
            for (let i = 0; i < res.characteristics.length; i++) {
      let charc = res.characteristics[i];
      if (charc.properties.notify) {
        notify_id = charc.uuid;           
      }
      if(charc.properties.write){
        write_id = charc.uuid;
      }
      if(charc.properties.write){
        read_id = charc.uuid;
      }
    }
  },
  fail(res){
    console.log(res); 
  }
})

            wx.notifyBLECharacteristicValueChange({
  state: 
            true
            ,
  deviceId: device_id,
  serviceId: service_id,
  characteristicId:notify_id,
  complete(res) {
    wx.onBLECharacteristicValueChange(
            function
             (res) {
      console.log(arrayBufferToHexString(res.value));
    })
  },
  fail(res){
    console.log(res);
  }
})
        

let buf = hexStringToArrayBuffer("test");
wx.writeBLECharacteristicValue({
  deviceId: device_id,
  serviceId: service_id,
  characteristicId:write_id,
  value: buf,
  success: function (res) {
    console.log(buf);
  },
  fail(res){
    console.log(res);
  }
})
function hexStringToArrayBuffer(str) {
  if (!str) {
    returnnew ArrayBuffer(0);
  }
  var buffer = new ArrayBuffer(str.length);
  let dataView = new DataView(buffer)
  let ind = 0;
  for (var i = 0, len = str.length; i < len; i += 2) {
    let code = parseInt(str.substr(i, 2), 16)
    dataView.setUint8(ind, code)
    ind++
  }
  return buffer;
}

            wx.closeBLEConnection({
  deviceId: device_id,
  success(res) {
    console.log(res)
  },
  fail(res) {
    console.log(res)
  }
})
wx.closeBluetoothAdapter({
  success: 
            function
             (res) {
    console.log(res)
  }
})