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class Bluetooth {
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constructor() {
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this.isOpenBle = false;
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this.deviceId = "";
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this.serviceId = "";
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this.writeId = "";
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this.notifyId = "";
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this.openBluetoothAdapter();
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}
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showToast(title) {
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uni.showToast({
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title: title,
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icon: 'none',
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'duration': 2000
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});
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}
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//初始化蓝牙模块，检查蓝牙是否已打开
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openBluetoothAdapter() {
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return new Promise((resolve, reject) => {
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uni.openBluetoothAdapter({
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success: res => {
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this.isOpenBle = true;
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resolve(res);
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},
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fail: err => {
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setTimeout(function() {
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uni.showToast({
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title:"请打开蓝牙和定位功能",
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icon:"none"
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})
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}, 1000);
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reject(err);
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},
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});
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});
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}
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//搜索周边蓝牙设备
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startBluetoothDevicesDiscovery() {
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if (!this.isOpenBle) {
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this.showToast(`请打开蓝牙和定位功能`)
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return;
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}
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let self = this;
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uni.showLoading({
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title: '正在搜索蓝牙设备'
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})
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return new Promise((resolve, reject) => {
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setTimeout(() => {
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uni.startBluetoothDevicesDiscovery({
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success: res => {
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resolve(res)
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},
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fail: res => {
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self.showToast(`搜索设备失败` + JSON.stringify(err));
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reject(err);
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}
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})
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}, 300);
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});
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}
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//停止搜索周报蓝牙设备
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stopBluetoothDevicesDiscovery() {
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let self = this;
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return new Promise((resolve, reject) => {
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uni.stopBluetoothDevicesDiscovery({
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success: e => {
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uni.hideLoading();
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},
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fail: e => {
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uni.hideLoading();
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self.showToast('停止搜索失败，请重试');
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}
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})
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});
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}
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//连接设备
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createBLEConnection() {
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let deviceId = this.deviceId;
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let self = this;
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return new Promise((resolve, reject) => {
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uni.createBLEConnection({
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deviceId,
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success: (res) => {
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console.log("成功连接设备" + JSON.stringify(res));
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resolve(res)
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},
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fail: err => {
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self.showToast(`设备连接失败` + JSON.stringify(err));
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reject(err);
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}
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})
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});
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}
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//获取蓝牙设备所有服务(service)
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getBLEDeviceServices() {
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let _serviceList = [];
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let deviceId = this.deviceId;
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let self = this;
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return new Promise((resolve, reject) => {
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setTimeout(() => {
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uni.getBLEDeviceServices({
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deviceId,
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success: res => {
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//console.log('获取服务成功');
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//console.log(res.services);
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for (let service of res.services) {
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if (service.isPrimary) {
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_serviceList.push(service);
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}
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}
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if(res.services.length<=0){
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self.showToast('成功获取服务，但没有可用服务');
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}
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resolve(_serviceList)
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},
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fail: err => {
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//设备已连接，但未能获取设备服务，也有可能连接处于断开状态
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self.showToast('未获取蓝牙设备相关服务');
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reject(err);
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},
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})
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}, 2000);
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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(characteristic)
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getBLEDeviceCharacteristics() {
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let deviceId = this.deviceId;
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let serviceId = this.serviceId;
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let self = this;
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return new Promise((resolve, reject) => {
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uni.getBLEDeviceCharacteristics({
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deviceId,
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serviceId,
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success: res => {
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for (let _obj of res.characteristics) {
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//获取notify
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if (_obj.properties.notify) {
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self.notifyId = _obj.uuid;
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uni.setStorageSync('notifyId', self.notifyId);
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}
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//获取writeId
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if (_obj.properties.write) {
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self.writeId = _obj.uuid;
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uni.setStorageSync('writeId', self.writeId);
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}
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}
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let result = {
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'notifyId': self.notifyId,
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'writeId': self.writeId
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};
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//成功获取到设备的服务特征值，可以测试设备功能了
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//self.showToast('已获取打印机服务，请测试打印功能')
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resolve(result)
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},
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fail: err => {
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//已连接设备，但未能获取设备服务
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self.showToast('未能获取设备相关服务，请重试')
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reject(err);
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}
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})
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});
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}
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//断开蓝牙链接
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closeBLEConnection() {
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let deviceId = this.deviceId;
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uni.closeBLEConnection({
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deviceId,
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success(res) {
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console.log('蓝牙连接已断开')
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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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notifyBLECharacteristicValue() {
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let deviceId = this.deviceId;
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let serviceId = this.serviceId;
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let characteristicId = this.notifyId;
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//特征值变化时，异步通知提示
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uni.notifyBLECharacteristicValueChange({
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state: true, // 启用 notify 功能
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deviceId,
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serviceId,
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characteristicId,
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success(res) {
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//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
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uni.onBLECharacteristicValueChange(function(res) {
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});
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},
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fail(res) {
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console.log('notifyBLECharacteristicValueChange failed:' + res.errMsg);
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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。注意：必须设备的特征值支持 write 才可以成功调用
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writeBLECharacteristicValue(buffer) {
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let deviceId = this.deviceId;
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let serviceId = this.serviceId;
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let characteristicId = this.writeId;
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//console.log("当前连接蓝牙设备服务信息: " + JSON.stringify(this));
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return new Promise((resolve, reject) => {
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uni.writeBLECharacteristicValue({
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deviceId,
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serviceId,
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characteristicId,
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value: buffer,
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success(res) {
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//console.log('message发送成功', JSON.stringify(res));
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resolve(res);
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},
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fail(err) {
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console.log('message发送失败', JSON.stringify(err));
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reject(err);
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}
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});
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});
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}
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//关闭蓝牙连接，想要连接要重新启动
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closeBluetoothAdapter() {
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uni.closeBluetoothAdapter({
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success: res => {
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//console.log(res)
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}
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});
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}
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//若APP在之前已有搜索过某个蓝牙设备，并成功建立连接，可直接传入之前搜索获取的 deviceId 直接尝试连接该设备，无需进行搜索操作。
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reconnect() {
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(async () => {
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try {
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this.deviceId = this.deviceId || uni.getStorageSync("deviceId");//设备id
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this.serviceId = this.serviceId || uni.getStorageSync("serviceId");//服务id
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this.notifyId = this.notifyId || uni.getStorageSync("notifyId");//
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this.writeId = this.writeId || uni.getStorageSync("writeId");//写入二进制数据 特征值id
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//连接蓝牙设备
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await this.createBLEConnection();
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//获取蓝牙设备服务
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//await this.getBLEDeviceServices();
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uni.hideLoading()
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if(!this.serviceId || this.serviceId == ''){
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//this.showToast('打印服务已断开，请到开发设置重新搜索蓝牙设备')
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uni.showModal({
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title: '打印机断开提示',
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content: '打印服务已断开，请到开发设置重新搜索蓝牙设备'
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});
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}else if(!this.writeId || this.writeId == ''){
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//重新获取蓝牙设备服务特征值
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await this.getBLEDeviceCharacteristics();
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this.showToast('成功连接打印机')
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}else {
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this.showToast('成功连接打印机')
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}
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} catch (err) {
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uni.hideLoading()
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console.log("err: " + JSON.stringify(err));
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}
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})();
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}
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}
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export default Bluetooth;
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