注:如果只需要读取设备传过来的数据就可以只找可读的uuid,要发送指令的话要找设备中可读可写可执行的uuid
async bluetooth(){
let that = this;
let device = await navigator.bluetooth.requestDevice({
filters: [
//过滤出来的连接设备
],
optionalServices: [this.dioServiceUuid],
// acceptAllDevices: true//设置acceptAllDevices代表查询所有蓝牙设备 也是必须配置optionalServices
});
device.addEventListener('gattserverdisconnected', onDisconnected);//监听设备断开连接
let server = await device.gatt.connect()
.catch(error => {
console.log('Argh! ' + error);
alert('Argh! ' + error);
return;
});
//获取当前时间并打印
var _this = this;
let yy = new Date().getFullYear();
let mm = new Date().getMonth() + 1;
let dd = new Date().getDate();
let hh = new Date().getHours();
let mf = new Date().getMinutes() < 10 ? '0' + new Date().getMinutes() : new Date().getMinutes();
let ss = new Date().getSeconds() < 10 ? '0' + new Date().getSeconds() : new Date().getSeconds();
_this.gettime = yy + '/' + mm + '/' + dd + ' ' + hh + ':' + mf + ':' + ss;
alert(_this.gettime + '蓝牙设备已连接! ');
console.log(_this.gettime + '蓝牙设备已连接! ');
let service = await server.getPrimaryService(this.dioServiceUuid);
console.log(service)
let characteristic = await service.getCharacteristic(this.dioCharacteristicUuid);
console.log(characteristic)
characteristic.readValue();//读取命令
characteristic.startNotifications();//监听命令下发后的返回值0
let nowStatus = true
//监听蓝牙设备命令下发后的返回值
characteristic.addEventListener('characteristicvaluechanged',item => {
//收到之后会得到一个ArrayBuffer对象,根据设备开发文档解析ArrayBuffer对象然后截取出通过蓝牙所传递的数据
})
function onDisconnected(event) {
let that = this;
that.stats = false;
const device = event.target;
//获取当前时间并打印
var _this = this;
let yy = new Date().getFullYear();
let mm = new Date().getMonth() + 1;
let dd = new Date().getDate();
let hh = new Date().getHours();
let mf = new Date().getMinutes() < 10 ? '0' + new Date().getMinutes() : new Date().getMinutes();
let ss = new Date().getSeconds() < 10 ? '0' + new Date().getSeconds() : new Date().getSeconds();
_this.gettime = yy + '/' + mm + '/' + dd + ' ' + hh + ':' + mf + ':' + ss;
console.log(this.stats);
console.log(_this.gettime + `设备: ${device.name} 已经断开连接`);
}
// 把向设备发送的指令转换为ArrayBuffer对象发送
function string2buffer(str) {
// 首先将字符串转为16进制
let val = ""
for (let i = 0; i < str.length; i++) {
if (val === '') {
val = str.charCodeAt(i).toString(16)
} else {
val += ',' + str.charCodeAt(i).toString(16)
}
}
// 将16进制转化为ArrayBuffer
return new Uint8Array(val.match(/[\da-f]{2}/gi).map(function (h) {
return parseInt(h, 16)
})).buffer
}
function ab2hex(buffer) {
const hexArr = Array.prototype.map.call(
new Uint8Array(buffer),
function (bit) {
return ('00' + bit.toString(16)).slice(-2);
}
)
return hexArr.join('');
}
},
