小程序wxnotifyBLECharacteristicValueChanged

如何看待微信公开课小程序热门讨论「小程序wxnotifyBLECharacteristicValueChanged」
摘要：小程序wxnotifyBLECharacteristicValueChanged
展开：wx.notifyBLECharacteristicValueChanged设置后没有效果，求大神指点！现象：蓝牙连接成功后，设备上传消息给小程序，小程序无法自动读取并提示，需要手动执行wx.readBLECharacteristicValue才会在wx.onBLECharacteristicValueChange方法中获得消息。手动执行存在每次点击都会读取Characteristic中的值，无法判断这个值是否已读。设置步骤如下：onLoad:function(){wx.onBLECharacteristicValueChange(function(res){//获得消息解码并输出console.log(value:,characteristic+res.characteristicId+aschanged,nowis+res.value);//console.log(value:,value+res.value[0]++res.value[1]);letbufferres.valueletdataViewnewDataView(buffer)console.log(value:,dataView.getUint8(0))})｝updateBTDevs:function(dev){console.log(JSON.stringify(dev));varthatthis;if(this.btdevshashnulldev[name]Xinda){this.btdevshashdev;wx.createBLEConnection({//连接蓝牙设备deviceId:that.btdevshash[deviceId],success:function(res){console.log(res);setTimeout(function(){wx.notifyBLECharacteristicValueChanged({//连接后设置监听deviceId:that.btdevshash[deviceId],serviceId:0000180f00001000800000805f9b34fb,characteristicId:00002a1900001000800000805f9b34fb,state:true,success:function(res){console.log(bind:,res);},fail:function(res){console.log(bindfailed,res)}})}.bind(this),3000)}})}},设置过程中，此Characteristic的属性notify可以修改，并成功修改为true，但是notify功能不工作。于是增加按钮执行readBLECharacteristicValue做测试，每次点击按钮，可以在onBLECharacteristicValueChange函数中获得最新值（读取后再次读取还是这个值）代码如下：bindHelp:function(){wx.readBLECharacteristicValue({deviceId:this.btdevshash[deviceId],serviceId:0000180f00001000800000805f9b34fb,characteristicId:00002a1900001000800000805f9b34fb,success:function(res){console.log(readBLECharacteristicValue:,res)}})},