Bluno with Web Bluetooth: startNotifications() fails
r03ert0 2022-05-18 23:13:27 1670 Views4 Replies Hello!
I'm building a web app for controlling a little toy robot. I got a Bluno, and the pairing, etc., works nicely, however, I'm stuck with an error when I try to startNotifications().
The error seems to be the one that's described in this question from 6 years ago: https://www.dfrobot.com/forum/topic/2035
Is there a fix for that, or a workaround that people may have find out?
Thank you very much in advance for your help!
```html
<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>bluetooth test</title></head><body> <button id="scan">scan</button> <button id="disconnect">disconnect</button> <button id="reconnect">reconnect</button> <button id="send">send</button> <script> var bluetoothDevice = null; var Bcharacteristic = null; document.querySelector('#scan').addEventListener("click", () => { navigator.bluetooth.requestDevice({ optionalServices: ["0000dfb0-0000-1000-8000-00805f9b34fb"], acceptAllDevices: true, }) .then(device => { // Human-readable name of the device. console.log('Connecting to GATT Server...'); bluetoothDevice = device; // Attempts to connect to remote GATT Server. return bluetoothDevice.gatt.connect(); }) .then(server => { // Getting Service… console.log('Getting Service...'); return server.getPrimaryService('0000dfb0-0000-1000-8000-00805f9b34fb'); }) .then(service => { // Getting Characteristic… console.log('Getting Characteristic...'); return service.getCharacteristic('0000dfb2-0000-1000-8000-00805f9b34fb'); }) .then(characteristic => { return characteristic.startNotifications(); }) .then(characteristic => { characteristic.addEventListener('characteristicvaluechanged', handleCharacteristicValueChanged); console.log('Notifications have been started.'); }) .catch(error => { console.error(error); }); })```
MyeongJin.Jeong Hi!
We generally use ArduinoIDE to program the Bluno. But your code doesn't seem to be ArduinoC. Could you pls tell me more details?
did you solve this problem?
I ran into the same problem while working on a project.
I've been looking for a way for a week now, but I couldn't find one.
There was no reference anywhere that said it was solved.
did you solve it? Can you tell me how you solved it?
Below is part of the code I wrote. Here, the error occurred at line 39.
MyeongJin.Jeong Hi! What exactly do you want to achieve? What are the specific problems or errors encountered?
Tonny12138 