WeChat Mini Program--Ble Bluetooth

This article mainly introduces the implementation method of WeChat applet-Ble Bluetooth. The source code download is attached to the article, which has good reference value. Let’s take a look with the editor below

It’s been a while. There are no articles written about mini programs. On March 28, WeChat’s API received another new update. The long-awaited Bluetooth API update. Just started masturbating.

Source code address

1. Brief description

The Bluetooth adapter interface is supported starting from version 1.1.0 of the basic library.

The iOS WeChat client starts to support version 6.5.6, the Android client does not support it yet

Bluetooth has added a total of 18 api interfaces.

2.Api classification

Search class

Connection class

Communication class

3 .API specific usage

For details, please see the official website:

https://mp.weixin.qq.com/debug/wxadoc/dev/api/bluetooth.html#wxgetconnectedbluethoothdevicesobject

4. Case implementation

#4.1 Search for Bluetooth devices

/**
 * 搜索设备界面
 */
Page({
 data: {
 logs: [],
 list:[],
 },
 onLoad: function () {
 console.log('onLoad')
var that = this;
// const SDKVersion = wx.getSystemInfoSync().SDKVersion || '1.0.0'
// const [MAJOR, MINOR, PATCH] = SDKVersion.split('.').map(Number)
// console.log(SDKVersion);
// console.log(MAJOR);
// console.log(MINOR);
// console.log(PATCH);

// const canIUse = apiName => {
// if (apiName === 'showModal.cancel') {
//  return MAJOR >= 1 && MINOR >= 1
// }
// return true
// }

// wx.showModal({
// success: function(res) {
//  if (canIUse('showModal.cancel')) {
//  console.log(res.cancel)
//  }
// }
// })
  //获取适配器
  wx.openBluetoothAdapter({
  success: function(res){
  // success
  console.log("-----success----------");
   console.log(res);
   //开始搜索
  wx.startBluetoothDevicesDiscovery({
 services: [],
 success: function(res){
 // success
  console.log("-----startBluetoothDevicesDiscovery--success----------");
  console.log(res);
 },
 fail: function(res) {
 // fail
  console.log(res);
 },
 complete: function(res) {
 // complete
  console.log(res);
 }
})

  },
  fail: function(res) {
   console.log("-----fail----------");
  // fail
   console.log(res);
  },
  complete: function(res) {
  // complete
   console.log("-----complete----------");
   console.log(res);
  }
 })

  wx.getBluetoothDevices({
  success: function(res){
   // success
   //{devices: Array[11], errMsg: "getBluetoothDevices:ok"}
   console.log("getBluetoothDevices");
   console.log(res);
   that.setData({
   list:res.devices
   });
   console.log(that.data.list);
  },
  fail: function(res) {
   // fail
  },
  complete: function(res) {
   // complete
  }
  })

 },
 onShow:function(){

 },
 //点击事件处理
 bindViewTap: function(e) {
  console.log(e.currentTarget.dataset.title);
  console.log(e.currentTarget.dataset.name);
  console.log(e.currentTarget.dataset.advertisData);

 var title = e.currentTarget.dataset.title;
 var name = e.currentTarget.dataset.name;
  wx.redirectTo({
  url: '../conn/conn?deviceId='+title+'&name='+name,
  success: function(res){
   // success
  },
  fail: function(res) {
   // fail
  },
  complete: function(res) {
   // complete
  }
  })
 },
})

4.2 Connect to obtain data

/**
 * 连接设备。获取数据
 */
Page({
 data: {
  motto: 'Hello World',
  userInfo: {},
  deviceId: '',
  name: '',
  serviceId: '',
  services: [],
  cd20: '',
  cd01: '',
  cd02: '',
  cd03: '',
  cd04: '',
  characteristics20: null,
  characteristics01: null,
  characteristics02: null,
  characteristics03: null,
  characteristics04: null,
  result,

 },
 onLoad: function (opt) {
  var that = this;
  console.log("onLoad");
  console.log('deviceId=' + opt.deviceId);
  console.log('name=' + opt.name);
  that.setData({ deviceId: opt.deviceId });
  /**
   * 监听设备的连接状态
   */
  wx.onBLEConnectionStateChanged(function (res) {
   console.log(`device ${res.deviceId} state has changed, connected: ${res.connected}`)
  })
  /**
   * 连接设备
   */
  wx.createBLEConnection({
   deviceId: that.data.deviceId,
   success: function (res) {
    // success
    console.log(res);
    /**
     * 连接成功，后开始获取设备的服务列表
     */
    wx.getBLEDeviceServices({
     // 这里的 deviceId 需要在上面的 getBluetoothDevices中获取
     deviceId: that.data.deviceId,
     success: function (res) {
      console.log('device services:', res.services)
      that.setData({ services: res.services });
      console.log('device services:', that.data.services[1].uuid);
      that.setData({ serviceId: that.data.services[1].uuid });
      console.log('--------------------------------------');
      console.log('device设备的id:', that.data.deviceId);
      console.log('device设备的服务id:', that.data.serviceId);
      /**
       * 延迟3秒，根据服务获取特征 
       */
      setTimeout(function () {
       wx.getBLEDeviceCharacteristics({
        // 这里的 deviceId 需要在上面的 getBluetoothDevices
        deviceId: that.data.deviceId,
        // 这里的 serviceId 需要在上面的 getBLEDeviceServices 接口中获取
        serviceId: that.data.serviceId,
        success: function (res) {
         console.log('000000000000' + that.data.serviceId);
         console.log('device getBLEDeviceCharacteristics:', res.characteristics)
         for (var i = 0; i < 5; i++) {
          if (res.characteristics[i].uuid.indexOf("cd20") != -1) {
           that.setData({
            cd20: res.characteristics[i].uuid,
            characteristics20: res.characteristics[i]
           });
          }
          if (res.characteristics[i].uuid.indexOf("cd01") != -1) {
           that.setData({
            cd01: res.characteristics[i].uuid,
            characteristics01: res.characteristics[i]
           });
          }
          if (res.characteristics[i].uuid.indexOf("cd02") != -1) {
           that.setData({
            cd02: res.characteristics[i].uuid,
            characteristics02: res.characteristics[i]
           });
          } if (res.characteristics[i].uuid.indexOf("cd03") != -1) {
           that.setData({
            cd03: res.characteristics[i].uuid,
            characteristics03: res.characteristics[i]
           });
          }
          if (res.characteristics[i].uuid.indexOf("cd04") != -1) {
           that.setData({
            cd04: res.characteristics[i].uuid,
            characteristics04: res.characteristics[i]
           });
          }
         }
         console.log(&#39;cd01= &#39; + that.data.cd01 + &#39;cd02= &#39; + that.data.cd02 + &#39;cd03= &#39; + that.data.cd03 + &#39;cd04= &#39; + that.data.cd04 + &#39;cd20= &#39; + that.data.cd20);
         /**
          * 回调获取 设备发过来的数据
          */
         wx.onBLECharacteristicValueChange(function (characteristic) {
          console.log(&#39;characteristic value comed:&#39;, characteristic.value)
          //{value: ArrayBuffer, deviceId: "D8:00:D2:4F:24:17", serviceId: "ba11f08c-5f14-0b0d-1080-007cbe238851-0x600000460240", characteristicId: "0000cd04-0000-1000-8000-00805f9b34fb-0x60800069fb80"}
          /**
           * 监听cd04cd04中的结果
           */
          if (characteristic.characteristicId.indexOf("cd01") != -1) {
           const result = characteristic.value;
           const hex = that.buf2hex(result);
           console.log(hex);
          }
          if (characteristic.characteristicId.indexOf("cd04") != -1) {
           const result = characteristic.value;
           const hex = that.buf2hex(result);
           console.log(hex);
           that.setData({ result: hex });
          }

         })
         /**
          * 顺序开发设备特征notifiy
          */
         wx.notifyBLECharacteristicValueChanged({
          deviceId: that.data.deviceId,
          serviceId: that.data.serviceId,
          characteristicId: that.data.cd01,
          state: true,
          success: function (res) {
           // success
           console.log(&#39;notifyBLECharacteristicValueChanged success&#39;, res);
          },
          fail: function (res) {
           // fail
          },
          complete: function (res) {
           // complete
          }
         })
         wx.notifyBLECharacteristicValueChanged({
          deviceId: that.data.deviceId,
          serviceId: that.data.serviceId,
          characteristicId: that.data.cd02,
          state: true,
          success: function (res) {
           // success
           console.log(&#39;notifyBLECharacteristicValueChanged success&#39;, res);
          },
          fail: function (res) {
           // fail
          },
          complete: function (res) {
           // complete
          }
         })
         wx.notifyBLECharacteristicValueChanged({
          deviceId: that.data.deviceId,
          serviceId: that.data.serviceId,
          characteristicId: that.data.cd03,
          state: true,
          success: function (res) {
           // success
           console.log(&#39;notifyBLECharacteristicValueChanged success&#39;, res);
          },
          fail: function (res) {
           // fail
          },
          complete: function (res) {
           // complete
          }
         })

         wx.notifyBLECharacteristicValueChanged({
          // 启用 notify 功能
          // 这里的 deviceId 需要在上面的 getBluetoothDevices 或 onBluetoothDeviceFound 接口中获取
          deviceId: that.data.deviceId,
          serviceId: that.data.serviceId,
          characteristicId: that.data.cd04,
          state: true,
          success: function (res) {
           console.log(&#39;notifyBLECharacteristicValueChanged success&#39;, res)
          }
         })

        }, fail: function (res) {
         console.log(res);
        }
       })
      }
       , 1500);
     }
    })
   },
   fail: function (res) {
    // fail
   },
   complete: function (res) {
    // complete
   }
  })
 },

 /**
  * 发送 数据到设备中
  */
 bindViewTap: function () {
  var that = this;
  var hex = &#39;AA5504B10000B5&#39;
  var typedArray = new Uint8Array(hex.match(/[\da-f]{2}/gi).map(function (h) {
   return parseInt(h, 16)
  }))
  console.log(typedArray)
  console.log([0xAA, 0x55, 0x04, 0xB1, 0x00, 0x00, 0xB5])
  var buffer1 = typedArray.buffer
  console.log(buffer1)
  wx.writeBLECharacteristicValue({
   deviceId: that.data.deviceId,
   serviceId: that.data.serviceId,
   characteristicId: that.data.cd20,
   value: buffer1,
   success: function (res) {
    // success
    console.log("success 指令发送成功");
    console.log(res);
   },
   fail: function (res) {
    // fail
    console.log(res);
   },
   complete: function (res) {
    // complete
   }
  })

 },
 /**
  * ArrayBuffer 转换为 Hex
  */
 buf2hex: function (buffer) { // buffer is an ArrayBuffer
  return Array.prototype.map.call(new Uint8Array(buffer), x => (&#39;00&#39; + x.toString(16)).slice(-2)).join(&#39;&#39;);
 }
})

5. Effect display

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