404 lines
9.9 KiB
JavaScript
404 lines
9.9 KiB
JavaScript
function BLEDevice(arg) {
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this.deviceId = "";
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this.serviceId = "";
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this.debug = arg ? (arg['debug'] || false) : false;
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this.connectTimeout = arg ? (arg['connectTimeout'] || 10000) : 10000;
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this.onBLECharacteristicValueChange = {}
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};
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/**
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* 日志输出
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*
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* @param {msg} String
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* 输出的信息
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* @param {Array} args
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* 辅助输出信息
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*/
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BLEDevice.prototype.log = function (msg, ...args) {
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if (this.debug) {
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console.log(msg, ...args)
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}
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};
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BLEDevice.prototype.setStateCallBack = function (cb) {
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wx.onBluetoothAdapterStateChange((res) => {
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cb(res);
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});
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}
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/**
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* 初始化蓝牙模块
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*
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* @return
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* 返回蓝牙模块Promise
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*/
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BLEDevice.prototype.openBluetoothAdapter = function() {
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return new Promise((resolve, reject) => {
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wx.openBluetoothAdapter({
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success: (res) => {
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this.log("openBluetoothAdapter", res);
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resolve(res);
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},
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fail: (res) => {
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this.log("openBluetoothAdapter failed", res)
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reject(res);
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}
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})
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})
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};
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/**
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* 关闭蓝牙模块
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*/
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BLEDevice.prototype.closeBluetoothAdapter = function() {
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wx.closeBluetoothAdapter();
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};
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/**
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* 获取本机蓝牙适配器状态
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*/
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BLEDevice.prototype.getBluetoothAdapterState = function () {
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wx.getBluetoothAdapterState({
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success: (res) => {
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if (res.discovering) {
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this.onBluetoothDeviceFound()
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} else if (res.available) {
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setTimeout(()=>{
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this.startBluetoothDevicesDiscovery(state.servicesId, state.key);
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},500)
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}
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}
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})
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};
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/**
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* 开始搜寻附近的蓝牙外围设备
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*
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* @param {String} servicesId
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* 要搜索的蓝牙设备主服务的uuid列表
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* @param {Function} cb
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* 发现设备后的回调
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* 若发现成功，参数success为true，foundDevices：发现的设备列表
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* 若发现失败，参数success为false
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* @return
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* 返回搜索蓝牙设备Promise
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*/
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BLEDevice.prototype.startBluetoothDevicesDiscovery = function (servicesId, cb) {
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let foundDevices = [];
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wx.onBluetoothDeviceFound((res) => {
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res.devices.forEach(device => {
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if (!device.name && !device.localName) {
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return;
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}
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const idx = inArray(foundDevices, 'deviceId', device.deviceId)
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if (idx === -1) {
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foundDevices.push(device)
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} else {
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foundDevices[idx] = device
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}
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this.log("onBluetoothDeviceFound", foundDevices);
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cb({ success: true, foundDevices: foundDevices});
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})
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})
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wx.startBluetoothDevicesDiscovery({
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services: servicesId,
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allowDuplicatesKey: true,
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success: (res) => {
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this.log("startBluetoothDevicesDiscovery", res);
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},
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fail: (res) => {
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cb({ success: false });
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}
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})
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};
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/**
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* 停止搜寻附近的蓝牙外围设备
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*/
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BLEDevice.prototype.stopBluetoothDevicesDiscovery = function () {
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wx.stopBluetoothDevicesDiscovery();
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};
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/**
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* 连接低功耗蓝牙设备
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*
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* @param {String} deviceId
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* 连接设备的ID
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*
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* @return
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* 返回设备连接的Promise
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*/
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BLEDevice.prototype.createBLEConnection = function (deviceId) {
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this.deviceId = deviceId;
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return new Promise((resolve, reject) => {
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wx.createBLEConnection({
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deviceId: this.deviceId,
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success: (res) => {
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this.log("createBLEConnection", res)
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this.getBLEDeviceServices()
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.then(() => {
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resolve();
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}).catch((res) => {
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reject(res);
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this.closeBLEConnection();
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})
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},
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fail: (res) => {
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this.log("createBLEConnection failed", res)
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reject(res)
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}
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})
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this.stopBluetoothDevicesDiscovery();
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setTimeout(() => {
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reject('Connect timeout');
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this.closeBLEConnection();
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}, this.connectTimeout);
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})
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};
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/**
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* 断开与低功耗蓝牙设备的连接
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*/
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BLEDevice.prototype.closeBLEConnection = function () {
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wx.closeBLEConnection({
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deviceId: this.deviceId,
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})
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};
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/**
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* 获取蓝牙设备的所有服务
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*
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* @param {String} findServicesUUID
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* 要查找的主服务uuid
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*
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* @param {Number} findServicesIndex
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* 开始查找的位置
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*
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* @return
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* 返回获取服务的Promise
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*/
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BLEDevice.prototype.getBLEDeviceServices = function () {
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return new Promise((resolve, reject) => {
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wx.getBLEDeviceServices({
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deviceId: this.deviceId,
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success: (res) => {
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let total = res.services.length
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for (let i = 0; i < res.services.length; i++) {
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this.log("getBLEDeviceServices", res.services[i]);
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this.getBLEDeviceCharacteristics(res.services[i].uuid)
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.then(() => {
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total --;
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if (total === 0) {
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resolve();
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}
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})
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.catch(res => {
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reject(res);
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})
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}
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},
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fail: (res) => {
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reject(res);
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}
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})
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})
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};
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/**
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* 获取蓝牙设备某个服务中所有特征值
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*
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* @param {String} serviceId
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* 要查找特征的service uuid
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*
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* @return
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* 返回服务特征值的Promise
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*/
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BLEDevice.prototype.getBLEDeviceCharacteristics = function (serviceId) {
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return new Promise((resolve, reject) => {
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wx.getBLEDeviceCharacteristics({
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deviceId: this.deviceId,
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serviceId: serviceId,
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success: (res) => {
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resolve(res);
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for (let i = 0; i < res.characteristics.length; i++) {
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this.log("getBLEDeviceCharacteristics", i, res.characteristics[i]);
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let item = res.characteristics[i];
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if (item.properties.read) {
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this.log("可读：", res.characteristics[i]);
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}
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if (item.properties.write) {
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this.log("可写：", res.characteristics[i]);
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}
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if (item.properties.notify || item.properties.indicate) {
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this.log("可订阅", res.characteristics[i]);
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}
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}
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},
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fail: (res) => {
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reject(res);
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},
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complete: (res) => {
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}
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})
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})
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};
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/**
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* 读取低功耗蓝牙设备的特征值的二进制数据值
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*
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* @param {String} serviceId
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* 蓝牙可订阅服务的uuid
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*
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* @param {String} readCharacteristicId
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* 蓝牙可读特征值的uuid
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*
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* @param {Function} callback
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* 特征变化的回调函数
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*/
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BLEDevice.prototype.readBLECharacteristicValue = function (serviceId, readCharacteristicId, callback) {
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wx.onBLECharacteristicValueChange((characteristic) => {
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this.log("onBLECharacteristicValueChange", characteristic.value)
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let cb = this.onBLECharacteristicValueChange[readCharacteristicId]
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if (cb) {
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cb(characteristic)
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}
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})
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return new Promise((resolve, reject) => {
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wx.readBLECharacteristicValue({
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deviceId: this.deviceId,
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serviceId: serviceId,
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characteristicId: readCharacteristicId,
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success: (res) => {
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resolve(res)
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this.log('readBLECharacteristicValue', res);
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this.onBLECharacteristicValueChange[readCharacteristicId] = callback;
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},
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fail: (res) => {
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reject(res)
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}
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})
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})
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};
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/**
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* 向低功耗蓝牙设备特征值中写入二进制数据
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*
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* @param {String} writeCharacteristicId
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* 蓝牙可写特征值的uuid
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*
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* @param {ArrayBuffer} buffer
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* 特征值对应的二进制值
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*/
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BLEDevice.prototype.writeBLECharacteristicValue = function (serviceId, writeCharacteristicId, buffer) {
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// // 向蓝牙设备发送一个0x00的16进制数据
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this.log("writeBLECharacteristicValue buffer", buffer);
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wx.writeBLECharacteristicValue({
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deviceId: this.deviceId,
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serviceId: serviceId,
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characteristicId: writeCharacteristicId,
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value: buffer,
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success: (res) => {
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this.log('writeBLECharacteristicValue', res);
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}
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})
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};
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/**
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* 启用低功耗蓝牙设备特征值变化时的notify功能，订阅特征值
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*
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* @param {String} serviceId
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* 蓝牙可订阅服务的uuid
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*
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* @param {String} notifyCharacteristicId
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* 蓝牙可订阅特征值的uuid
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*
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* @param {Function} callback
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* 特征变化的回调函数
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*/
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BLEDevice.prototype.notifyBLECharacteristicValueChange = function (serviceId, notifyCharacteristicId, callback) {
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wx.onBLECharacteristicValueChange((characteristic) => {
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this.log("onBLECharacteristicValueChange", characteristic.value)
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let cb = this.onBLECharacteristicValueChange[notifyCharacteristicId]
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if (cb) {
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cb(characteristic)
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}
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})
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return new Promise((reslove, reject) => {
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wx.notifyBLECharacteristicValueChange({
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deviceId: this.deviceId,
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serviceId: serviceId,
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characteristicId: notifyCharacteristicId,
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state: true,
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success: (res) => {
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reslove(res)
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this.log('notifyBLECharacteristicValueChange', res);
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this.onBLECharacteristicValueChange[notifyCharacteristicId] = callback
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},
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fail: (res) => {
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reject(res)
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}
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})
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})
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};
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/**
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* 关闭低功耗蓝牙设备特征值变化时的notify功能，订阅特征值
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*
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* @param {String} serviceId
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* 蓝牙可订阅服务的uuid
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*
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* @param {String} notifyCharacteristicId
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* 蓝牙可订阅特征值的uuid
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*/
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BLEDevice.prototype.unNotifyBLECharacteristicValueChange = function (serviceId, notifyCharacteristicId) {
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return new Promise((resolve, reject) => {
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delete this.onBLECharacteristicValueChange[notifyCharacteristicId]
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wx.notifyBLECharacteristicValueChange({
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deviceId: this.deviceId,
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serviceId: serviceId,
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characteristicId: notifyCharacteristicId,
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state: false,
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success: function (res) {
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resolve(res)
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},
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fail: function (res) {
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reject(res)
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}
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})
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})
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}
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const inArray = (arr, key, val) => {
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for (let i = 0; i < arr.length; i++) {
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if (arr[i][key] === val) {
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return i;
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}
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}
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return -1;
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};
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/**
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* ArrayBuffer转16进度字符串示例
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*/
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const ab2hex = (buffer) => {
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var hexArr = Array.prototype.map.call(
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new Uint8Array(buffer),
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function (bit) {
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return ('00' + bit.toString(16)).slice(-2);
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}
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)
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return hexArr.join('');
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};
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module.exports = BLEDevice |