我有这个index.html文件，该文件与通过BLE运行bleno应用程序的Raspberry pi 3进行通讯。
<!-- <!DOCTYPE html> -->
<html>
<head>
<meta charset="utf-8">
<title>bluetooth</title>
<script type="text/javascript">
var serv;
var readVal="";
function onButtonClick() {
console.log('clciked');
let filters = [];
var options1 = {
enableHighAccuracy: true,
timeout: 5000,
maximumAge: 0
};
let options = {};
var tem = '00010000-89BD-43C8-9231-40F6E305F96D'.toLowerCase();
filters.push({services: [tem]});
options.acceptAllDevices = false;
options.filters = filters;
console.log('Requesting Bluetooth Device...');
console.log('with ' + JSON.stringify(options));
var listn;
if(navigator.bluetooth){
document.getElementById('result').innerHTML = "Bluetooth Supported";
}
else{
document.getElementById('result').innerHTML = "Bluetooth not Supported";
}
function success(pos) {
var crd = pos.coords;
console.log(crd);
}
function error(err) {
console.warn(`ERROR(${err.code}): ${err.message}`);
}
console.log(navigator);
navigator.geolocation.getCurrentPosition(success, error, options1);
// navigator.
let decoder = new TextDecoder('utf-8');
navigator.bluetooth.requestDevice(options)
.then(device => {
console.log('> Name: ' + device.name);
console.log('> Id: ' + device.id);
console.log('> Connected: ' + device.gatt.connected);
return device.gatt.connect();
})
.then(server => {
return server.getPrimaryService(tem);
})
.then(service => {
serv = service;
console.log(service);
return service.getCharacteristic('00010010-89bd-43c8-9231-40f6e305f96d');
})
.then(characteristic => {
// console.log(characteristic);
return characteristic.readValue();
})
.then(value => {
let decoder = new TextDecoder('utf-8');
var str = decoder.decode(value);
readVal = str;
console.log(value);
console.log(value.toString());
console.log(str);
})
.catch(error => {
console.log('Argh! ' + error);
});
}
function onSend() {
serv.getCharacteristics().then(characteristics =>{
// console.log(characteristics);
var charact;
for(var i = 0; i < characteristics.length; i++){
var ob = characteristics[i];
if(ob['properties']['write'] === true){
charact = ob;
}
}
console.log(charact);
var Encoder = new TextEncoder("utf-8");
console.log(readVal);
var b = Encoder.encode(readVal);
console.log(b);
charact.writeValue(b);
})
.then(_ => {
console.log('wrote data');
})
.catch(err => {
console.log(err);
});
}
</script>
</head>
<body>
<button id = "b1" onclick="onButtonClick();">Click</button>
<h1 id = 'result'></h1>
<div id = 'networks'></div>
<button id="send" onclick="onSend();">Send Back</button>
</body>
</html>
我可以从ble外设读取特征，但是由于index.html第0行未知的原因，我得到DOMException GATToperation失败。
我在Pi上的bleno应用app.js
var bleno = require('bleno');
var fs = require('fs');
var scannedNetworks = [];
const WIFI_SERVICE_UUID = "00010000-89BD-43C8-9231-40F6E305F96D";
const ARGUMENT_1_UUID = "00010001-89BD-43C8-9231-40F6E305F96D";
const RESULT_UUID = "00010010-89BD-43C8-9231-40F6E305F96D";
class ArgumentCharacteristic extends bleno.Characteristic {
constructor(uuid, name) {
super({
uuid: uuid,
properties: ["write"],
value: null,
descriptors: [
new bleno.Descriptor({
uuid: "2901",
value: name
})
]
});
this.argument = 0;
this.name = name;
}
onWriteRequest(data, offset, withoutResponse, callback) {
try {
if(data.length != 1) {
callback(this.RESULT_INVALID_ATTRIBUTE_LENGTH);
return;
}
this.argument = data.readUInt8();
let decoder = new TextDecoder('utf-8');
var str = decoder.decode(value);
console.log(`Argument ${this.name} is now ${this.argument}`);
console.log(str);
callback(this.RESULT_SUCCESS);
} catch (err) {
console.error(err);
callback(this.RESULT_UNLIKELY_ERROR);
}
}
}
class ResultCharacteristic extends bleno.Characteristic {
constructor() {
super({
uuid: RESULT_UUID,
properties: ["read"],
value: null,
descriptors: [
new bleno.Descriptor({
uuid: "2901",
value: "Calculation result"
})
]
});
//this.calcResultFunc = calcResultFunc;
}
onReadRequest(offset, callback) {
try {
fs.readFile('./weights.txt', (err,dat)=>{
if(!err){
var result = dat.toString();
console.log(`Returning result: ${result}`);
let data = new Buffer(result);
//data.writeUInt8(result, 0);
console.log(data);
callback(this.RESULT_SUCCESS, data);
}
});
} catch (err) {
console.error(err);
callback(this.RESULT_UNLIKELY_ERROR);
}
}
}
console.log("Starting bleno...");
bleno.on("stateChange", state => {
if (state === "poweredOn") {
bleno.startAdvertising("Visualizer thresholds", [WIFI_SERVICE_UUID], err => {
if (err) console.log(err);
});
} else {
console.log("Stopping...");
bleno.stopAdvertising();
}
});
bleno.on("advertisingStart", err => {
console.log("Configuring services...");
if(err) {
console.error(err);
return;
}
let argument1 = new ArgumentCharacteristic(ARGUMENT_1_UUID, "Argument 1");
let result = new ResultCharacteristic();
let calculator = new bleno.PrimaryService({
uuid: WIFI_SERVICE_UUID,
characteristics: [
result,
argument1
]
});
bleno.setServices([calculator], err => {
if(err)
console.log(err);
else
console.log("Services configured");
});
});
// some diagnostics
bleno.on("stateChange", state => console.log(`Bleno: Adapter changed state to ${state}`));
bleno.on("advertisingStart", err => console.log("Bleno: advertisingStart"));
bleno.on("advertisingStartError", err => console.log("Bleno: advertisingStartError"));
bleno.on("advertisingStop", err => console.log("Bleno: advertisingStop"));
bleno.on("servicesSet", err => console.log("Bleno: servicesSet"));
bleno.on("servicesSetError", err => console.log("Bleno: servicesSetError"));
bleno.on("accept", clientAddress => console.log(`Bleno: accept ${clientAddress}`));
bleno.on("disconnect", clientAddress => console.log(`Bleno: disconnect ${clientAddress}`));
你们能帮我解决我哪里出问题吗？
谢谢