微信小程序（通过蓝牙发送接收数据与下位机通信）

// pages/shouye/shouye.js var deviceId;//连接的设备的ID var i=0; var serviceId=[];//各种服务的ID var characteristicId=[];// var shujubianhuan=[]; Page({ data: { sendmsg:"", shujy:"31/.", long:"0", shumu:"", sousuo:"", status:"", zhuangtai:"未初始化",// shebei:"",// deviceName:"0",// deviceId:[],// devices:[],// connectedDeviceId:"",//已连接设备UUid services:"",//连接设备的服务 characteristics:"",//连接设备的状态值 writeServicweId:"",//可写服务UUid writeCharacteristicsId:"",//可写特征值UUid readServicweId:"",//可读服务UUid readCharacteristicsId:"",//可读特征值UUid notifyServicweId:"",//通知服务UUid }, shousuo:function(){ var that=this; wx.openBluetoothAdapter({ success:function(res){ that.setData({ zhuangtai:"适配成功，您已经成功开启蓝牙" }) wx.getBluetoothAdapterState({ success:function(res){ that.setData({ zhuangtai:"蓝牙适配器可用，当前蓝牙处于未连接状态" }) that.zhoubian(); }, fail:function(res){ that.setData({ zhuangtai:"蓝牙适配器不可用，已经与蓝牙设备连接。" }) wx.showModal({ title: '注意', content: '您的蓝牙设备已经连接了其他的设备，请确保连接的是当前使用的设备', }) } }) }, fail:function(res){ that.setData({ zhuangtai:"适配失败，请检查您的蓝牙设备是否开启" }) wx.showModal({ title: '注意', content: '您还未开启蓝牙，请先开启蓝牙', }) } }) }, //开始搜索蓝牙设备 zhoubian:function(){ var that = this; setTimeout(() => { wx.startBluetoothDevicesDiscovery({ success: function(res) { that.setData({ zhuangtai:"正在搜索中。。。", }) function ab2hex(buffer) { var hexArr = Array.prototype.map.call( new Uint8Array(buffer), function(bit) { return ('00' + bit.toString(16)).slice(-2) } ) return hexArr.join(''); } wx.getBluetoothDevices({ //获取周边蓝牙信息 success: function (res) { that.setData({ zhuangtai:"搜索设备:"+JSON.stringify(res.devices), shumu:"搜索到的蓝牙设备的数目："+res.devices.length, devices:res.devices }) } }) }, fail(res) { } }) }, 500) }, //连接蓝牙设备 connectTO:function(e) { var that=this; setTimeout(() => { wx.createBLEConnection({ deviceId: e.currentTarget.id, success: function(res) { that.setData({ connectedDeviceId:e.currentTarget.id, zhuangtai: e.currentTarget.id, //zhuangtai:"已连接"+e.currentTarget.id+'==='+'连接设备返回：'+res.errMsg, msg1:"", shumu:"已经连接一个" }) deviceId=e.currentTarget.id//连接的是哪一个保存在全局变量里面 that.tingshisousuo(); }, fail: function(res) { that.setData({ zhuangtai:"连接失败", }) } , complete:function(){ that.setData({ // zhuangtai:"调用结束", }) } }) }, 1000) }, //停止搜索周边设备 tingshisousuo:function(){ var that=this; // setTimeout(() => { wx.stopBluetoothDevicesDiscovery({ success: function(res) { that.setData({ zhuangtai:"停止搜索周边设备"+"/"+JSON.stringify(res.errMsg), suosou:res.discovering ? "；正在搜索":"；未在搜索", status:res.available ? "；可用" : "；不可用" }) that.getservice(); }, }) // }, 500) }, //获取蓝牙设备的 service 服务 getservice:function() { var that=this; // setTimeout(() => { wx.getBLEDeviceServices({ deviceId: that.data.connectedDeviceId, success: function(res) { for(var i=0;i<res.services.length;i++) { serviceId[i]=res.services[i].uuid;//将蓝牙模块的各种服务ID都保存在全局变量中 } that.setData({ services:res.services,//所有的服务ID zhuangtai:JSON.stringify(res.services), }) that.getBLEDeviceCharacteristics(); }, }) // }, 500) }, //获取蓝牙设备特征值:获取到的特征值有多个, 最后要用的事能读, 能写, 能监听的那个值的 uuid 作为特征值 id getBLEDeviceCharacteristics:function() { var that=this; //var myuuid=that.data.services[0].uuid;//具有通知读写的属性的服务uuid wx.getBLEDeviceCharacteristics({ deviceId: that.data.connectedDeviceId,//这里的deviceId需要在上面的getBLEDeviceServices或onBluetoothDeviceFound接口中获取 serviceId: "0000ffe0-0000-1000-8000-00805f9b34fb", success: function(res) { for (var i = 0; i <res.characteristics.length; i++) { characteristicId[i]=res.characteristics[i].uuid; if(res.characteristics[i].properties.notify){ that.setData({ notifyServicweId:"0000ffe1-0000-1000-8000-00805f9b34fb", notifyCharacteristicsId:res.characteristics[i].uuid, }) } if(res.characteristics[i].properties.write){ that.setData({ writeServicweId:"0000ffe1-0000-1000-8000-00805f9b34fb", writeCharacteristicsId:res.characteristics[i].uuid, }) } if(res.characteristics[i].properties.read){ that.setData({ readServicweId:"0000ffe1-0000-1000-8000-00805f9b34fb", readCharacteristicsId:res.characteristics[i].uuid, }) } } that.setData({ zhuangtai:JSON.stringify(res.characteristics) }) that.uselanyachaaracteristic(); }, fail: function(res) { that.setData({ zhuangtai:"获取特征值失败" }) } , complete:function(){ console.log("complete") } }) }, //启用蓝牙特征值变化, // 启用低功耗蓝牙设备特征值变化时的 notify 功能 uselanyachaaracteristic:function(){ var that=this; wx.notifyBLECharacteristicValueChange({ state: true,//是否启用 notify deviceId: deviceId,//蓝牙ID serviceId: "0000ffe0-0000-1000-8000-00805f9b34fb",//蓝牙特征值对应服务的 uuid characteristicId:"0000ffe1-0000-1000-8000-00805f9b34fb",//蓝牙特征值的 uuid success:function(res) { /* 用来监听手机蓝牙设备的数据变化 */ that.setData({ zhuangtai:"启用状态值变化成功" }) }, fail:function(res) { that.setData({ zhuangtai:"启用特征值变化失败" }) } }) function ab2hex (buffer) { var hexArr = Array.prototype.map.call( new Uint8Array(buffer), function (bit) { return ('00' + bit.toString(16)).slice(-2) } ) return hexArr.join('') } wx.reLaunch({ url: '../xiaoche/xiaoche' }) wx.onBLECharacteristicValueChange(function(res){ that.setData({ zhuangtai:'接收的数据是：'+ab2hex(res.value) }) }) }, // 断开设备连接 close() { var that=this if (that.data.connectedDeviceId) { wx.closeBLEConnection({ deviceId: that.data.connectedDeviceId, success: function(res) { that.closeBluetoothAdapter() }, fail(res) { } }) } else { that.closeBluetoothAdapter() } }, // 关闭蓝牙模块 closeBluetoothAdapter:function() { var that=this wx.closeBluetoothAdapter({ success: function(res) { that.setData({ zhuangtai:"断开蓝牙成功" }) }, fail: function(err) { } }) }, getmsg: function (event){ for (var i = 0; i < event.detail.length; i++) { shujubianhuan[i]=event.detail.value[i]-(-48); } this.setData({ sendmsg:event.detail.value-(-48)+'4746' }) }, sendData:function(event){ var that = this var hex = that.data.sendmsg //要发送的信息 var typedArr