微信小程序-蓝牙BLE4.0调试工具

功能介绍

结合微信小程序，实现扫描周围BLE4.0设备，并显示在微信小程序上。并可读取设备的服务值、特征值。

小程序体验

gh_e6877e16bfdc_344.jpg

代码实现

• index：点击顶部搜索按钮，展示周围蓝牙设备（UUID、RSSI、广播）。展示完毕后，可以点击"连接设备"，并连接设备

//点击搜索按钮方法
  scanBtnClick:function(){
    this.reloadBLEData();
  },

reloadBLEData(){
    var that = this;
    wx.openBluetoothAdapter({
      success:function(res){
        wx.getBluetoothAdapterState({
          success:function(res){
            var available = res.available;
            var discovering = res.discovering;
            if (!available){
              wx.showToast({
                title:"蓝牙不可用"
              });
              wx.hideLoading({
                complete: (res) => {},
              });
              return;
            }
            if(!discovering){
              var deviceArr = [];
              // 开始搜索周围蓝牙设备
              wx.startBluetoothDevicesDiscovery({
                // allowDuplicatesKey: true,
                success:function(res){
                  wx.hideLoading({
                    complete: (res) => {},
                  });
                  //发现周围蓝牙设备
                  wx.onBluetoothDeviceFound((result) => {
                    
                    var device = result.devices[0];
                    console.log(result.devices[0]);
            
                    var deviceName = device.localName;
                    var deviceId = device.deviceId;
                    var rssi = device.rssi;
                    var adid = device.advertisServiceUUIDs;
                      if(deviceArr.length == 0){
                        deviceArr.push(device);
                      } else{
                        //对数组中重复的数据去重
                        deviceArr.forEach(function(item, index, arr) {
                          if(arr.length > 0 && item.localName == deviceName){
                            arr.splice(index,1);
                            console.log('删除');
                          }
                        });
                        deviceArr.push(device);
                        console.log('添加');
                      }
                      that.setData({
                        //存放蓝牙设备数组
                        deviceArr:deviceArr,
                      })

                  })
                },

              })
            }
          },

        })

      },
      fail:function(res){
        wx.hideLoading({
          complete: (res) => {},
        });
        wx.showToast({
          title: '请先开启蓝牙',
          image:'../../images/fail.png'
        });
        
      }
    })
  },

//点击链接
  connectTap(res){
    var deviceName = res.currentTarget.dataset.devicename;
    var deviceId = res.currentTarget.dataset.deviceid;
    wx.stopBluetoothDevicesDiscovery({
    });
    
    wx.navigateTo({
      url: '../device/device?deviceName='+deviceName+'&deviceId='+deviceId,
    })
  },

• device：展示已经连接设备的的服务值、特征值（read、write、notify）

//处理连接后设备的服务、特征值
          wx.getBLEDeviceServices({

              deviceId: deviceId,
              success:function(res){
                var serviceIdArr = [];
                for (var i = 0; i <= res.services.length - 1; i++) {
                    var serviceId = res.services[i].uuid;
                    serviceIdArr.push(serviceId);
                    that.setData({
                      serviceIdArr: serviceIdArr
                    })
                    console.log('-----------'+serviceIdArr);
                }
                  var bleDataArr = [];
                  that.data.serviceIdArr.forEach(element => {
                    var bleDataDict = {};
                    wx.getBLEDeviceCharacteristics({
                      deviceId: deviceId,
                      serviceId: element,
                      success:function(res){
                        bleDataDict.deviceId = element;
                        bleDataDict.characteristics = res.characteristics;
                        bleDataArr.push(bleDataDict);
                        wx.hideLoading({
                          complete: (res) => {},
                        });
                        that.setData({
                          bleDataArr:bleDataArr

                        })
                      }
                    })
                  });
                  console.log(bleDataArr);
                  
              }
            })

• write：对获取了可写特征值的设备进行写操作

writeBLEValue:function(deviceId,serviceId,charaId,value){
  
    console.log('------'+deviceId+'------'+serviceId+'-------'+charaId);
    wx.writeBLECharacteristicValue({
      characteristicId: charaId,
      deviceId: deviceId,
      serviceId: serviceId,
      value: value,
      success:function(res){
        console.log('成功'+JSON.stringify(res));
        wx.showToast({
          title: '写入成功',
        })
      },
      fail:function(res){
        console.log('失败'+JSON.stringify(res));
        var errorMsg = '';
        if(res.errCode == '10000'){
          errorMsg = '未初始化蓝牙适配器';
        }else if(res.errCode == '10001'){
          errorMsg = '当前蓝牙适配器不可用';
        }else if(res.errCode == '10002'){
          errorMsg = '没有找到指定设备';
        }else if(res.errCode == '10003'){
          errorMsg = '连接失败';
        }else if(res.errCode == '10004'){
          errorMsg = '没有找到指定服务';
        }else if(res.errCode == '10005'){
          errorMsg = '没有找到指定特征值';
        }else if(res.errCode == '10006'){
          errorMsg = '当前连接已断开';
        }else if(res.errCode == '10007'){
          errorMsg = '当前特征值不支持此操作';
        }else if(res.errCode == '10008'){
          errorMsg = '其余所有系统上报的异常';
        }else if(res.errCode == '10009'){
          errorMsg = '系统版本低于 4.3 不支持 BLE';
        }else if(res.errCode == '10012'){
          errorMsg = '连接超时';
        }else if(res.errCode == '10013'){
          errorMsg = '连接 deviceId 为空或者是格式不正确';
        }
        wx.showToast({
          title: errorMsg,
          image:'../../images/fail.png'
        })
      }
    });
    
  },

//16进制数据处理
  string2buffer: function (str) {
    // 首先将字符串转为16进制
    let val = ""
    for (let i = 0; i < str.length; i++) {
      if (val === '') {
        val = str.charCodeAt(i).toString(16)
      } else {
        val += ',' + str.charCodeAt(i).toString(16)
      }
    }
    // 将16进制转化为ArrayBuffer
    return new Uint8Array(val.match(/[\da-f]{2}/gi).map(function (h) {
      return parseInt(h, 16)
    })).buffer
  },