Web前端之UniApp低功耗蓝牙一键开门、数组匹配数组、多对多查找、开锁

Html

<viewclass="m_t_36"><viewclass="w_50_ h_100 lh_100 m_l_a m_r_a bc_409eff radius_10 color_fff ta_c"@click="openBluetoothAdapter()">一键开门</view></view>

JavaScript

exportdefault{data(){return{timeout:undefined,// 后端保存蓝牙信息bluetooths:[{deviceId:"0A:45:32:0C:78:C6",name:"YX_0A45320C78C6",serviceId:'0000FFB0-0000-1000-8000-00805F9B34FB',notifyId:'0000FFB2-0000-1000-8000-00805F9B34FB',writeId:'0000FFB1-0000-1000-8000-00805F9B34FB',instruction:'EE03E30100'},{deviceId:"5C:C3:36:8D:B9:FC",name:"RTK_BT_4.1v",serviceId:'0000FFB0-0000-1000-8000-00805F9B34FB',notifyId:'0000FFB2-0000-1000-8000-00805F9B34FB',writeId:'0000FFB1-0000-1000-8000-00805F9B34FB',instruction:'EE03E30100'}],bluetooth:{}}},methods:{/** * 根据不同方法名调用方法，统一定时器的触发判断， * 当定时器触发时，无法确定当前调用的方法是哪个 * @param {String} fnName */methodExecution(fnName=''){if(this.timeout){this[fnName]();}else{console.log('执行方法');}},// 数据初始化initInfo(){// 清除定时器无效的解决方案this.timeout=undefined;this.bluetooth={};},// 初始化蓝牙模块openBluetoothAdapter(){letthat=this;// 向低功耗蓝牙设备特征值中写入二进制数据。// 注意：必须设备的特征值支持 write 才可以成功调用。if(Object.keys(that.bluetooth).length)returnthat.writeBLECharacteristicValue();// 数据初始化that.initInfo();// 初始化蓝牙模块uni.openBluetoothAdapter({// 主服务的UUID是YX。传入这个参数，只搜索主服务UUID为YX的设备// services: ['YX'],success(){// 开始搜索附近的蓝牙设备that.startBluetoothDevicesDiscovery();},fail(){uni.showToast({icon:'none',title:'查看手机蓝牙是否打开'});}});},// 开始搜索附近的蓝牙设备startBluetoothDevicesDiscovery(){letthat=this;uni.showLoading({title:'加载中',mask:true});that.timeout=setTimeout(()=>{// 数据初始化that.initInfo();uni.hideLoading();uni.showToast({icon:'none',title:'开门失败'});},1000*20);// 开始搜索附近的蓝牙设备uni.startBluetoothDevicesDiscovery({success(){// 监听返回的蓝牙设备uni.onBluetoothDeviceFound(({devices})=>{if(devices.length){letbluetooths=that.bluetooths;// 多对多查找for(leti=0;i<devices.length;i++){letitemI=devices[i];if(itemI.name){for(letj=0;j<bluetooths.length;j++){letitemJ=bluetooths[i];if(itemI.deviceId===itemJ.deviceId&&itemI.name===itemJ.name){that.bluetooth=itemJ;setTimeout(()=>{that.createBLEConnection()},0);returnundefined;}}}}}});},fail(){that.methodExecution('startBluetoothDevicesDiscovery');}});},// 连接低功耗蓝牙设备createBLEConnection(){letthat=this;// 连接低功耗蓝牙设备uni.createBLEConnection({deviceId:that.bluetooth.deviceId,success(){// 停止搜寻附近的蓝牙外围设备uni.stopBluetoothDevicesDiscovery({success(){// 获取蓝牙服务// that.getBLEDeviceServices();// 启用低功耗蓝牙设备特征值变化时的notify功能，订阅特征值that.notifyBLECharacteristicValueChange();},fail(){}});},fail(){// 连接低功耗蓝牙设备that.methodExecution('createBLEConnection');}});},// 启用低功耗蓝牙设备特征值变化时的notify功能，订阅特征值notifyBLECharacteristicValueChange(){letthat=this,{deviceId,serviceId,notifyId}=that.bluetooth;// 启用低功耗蓝牙设备特征值变化时的notify功能，订阅特征值uni.notifyBLECharacteristicValueChange({state:true,deviceId,serviceId,characteristicId:notifyId,success(){// 监听低功耗蓝牙设备的特征值变化事件。// 必须先启用 notifyBLECharacteristicValueChange 接口才能接收到设备推送的 notification。that.onBLECharacteristicValueChange();},fail(){// 启用低功耗蓝牙设备特征值变化时的notify功能，订阅特征值that.methodExecution('notifyBLECharacteristicValueChange');}});},// 监听低功耗蓝牙设备的特征值变化事件。// 必须先启用 notifyBLECharacteristicValueChange 接口才能接收到设备推送的 notification。onBLECharacteristicValueChange(){letthat=this;// 监听低功耗蓝牙设备的特征值变化事件。// 必须先启用 notifyBLECharacteristicValueChange 接口才能接收到设备推送的 notification。uni.onBLECharacteristicValueChange(()=>{that.writeBLECharacteristicValue();});},// 向低功耗蓝牙设备特征值中写入二进制数据。// 注意：必须设备的特征值支持 write 才可以成功调用。writeBLECharacteristicValue(){letthat=this,{deviceId,serviceId,writeId,instruction}=that.bluetooth,typedArray=newUint8Array(instruction.match(/[\da-f]{2}/gi).map((h)=>parseInt(h,16))),buffer=typedArray.buffer;// 向低功耗蓝牙设备特征值中写入二进制数据。// 注意：必须设备的特征值支持 write 才可以成功调用。uni.writeBLECharacteristicValue({deviceId,serviceId,characteristicId:writeId,value:buffer,success(){uni.showToast({title:'开门成功',icon:'none'});},fail(){uni.showToast({title:'开门失败',icon:'none'});},complete(){clearTimeout(that.timeout);that.timeout=undefined;uni.hideLoading();}});},// 关闭(断开)蓝牙模块closeBluetoothAdapter(){letthat=this;// 关闭(断开)蓝牙模块uni.closeBluetoothAdapter({success:()=>{uni.showToast({title:'蓝牙已关闭',icon:'none'});clearTimeout(that.timeout);that.timeout=undefined;uni.hideLoading();that.initInfo();},fail(){that.closeBluetoothAdapter();}});},// 监听页面隐藏onHide(){// 关闭(断开)蓝牙模块// this.closeBluetoothAdapter();},// 监听页面卸载onUnload(){// 关闭(断开)蓝牙模块this.closeBluetoothAdapter();}}}

坑

1、notifyBLECharacteristicValueChange方法用的是读取的特征值。
2、writeBLECharacteristicValue发送指令，返回成功，蓝牙设备无反应，大概率是指令问题。
3、关闭蓝牙有两个API，目前测试只有closeBluetoothAdapter彻底断开蓝牙。
4、setTimeout无法彻底清除定时器，需要手动设置属性值为undefined。