Hi!
I used the next code from ready JS example from Chrome WEB bluetooth API to send bytes to BLE app UART example.
Connection is established ok.
But I can't send data from function due to error: DOMException: GATT operation not permitted.
Please tell me how can I fix it? Thank you!
var myCharacteristic;
var deviceName;
function connect() {
let serviceUuid = "6e400001-b5a3-f393-e0a9-e50e24dcca9e";
let characteristicUuid = "6e400003-b5a3-f393-e0a9-e50e24dcca9e";
let characteristicRx = "6e400002-b5a3-f393-e0a9-e50e24dcca9e";
navigator.bluetooth.requestDevice({filters: [{services: [serviceUuid]}]})
.then(device => {
log('Connecting...');
deviceName = device.name;
return device.gatt.connect();
})
.then(server => {
console.log('Getting Service...');
return server.getPrimaryService(serviceUuid);
})
.then(service => {
console.log('Getting Characteristic...');
return service.getCharacteristic(characteristicUuid);
})
.then(characteristic => {
myCharacteristic = characteristic;
return myCharacteristic.startNotifications().then(_ => {
console.log('> Notifications started');
log("Connected to: " + deviceName);
myCharacteristic.addEventListener('characteristicvaluechanged',
handleNotifications);
});
})
.catch(error => {
console.log('Argh! ' + error);
});
}
function disconnect() {
if (myCharacteristic) {
myCharacteristic.stopNotifications()
.then(_ => {
console.log('> Notifications stopped');
log("Disconnected")
myCharacteristic.removeEventListener('characteristicvaluechanged',
handleNotifications);
})
.catch(error => {
console.log('Argh! ' + error);
});
}
}
function handleNotifications(event) {
let value = event.target.value;
log(deviceName + "> " + new TextDecoder().decode(value));
console.log('> Received: ' + new TextDecoder().decode(value));
}
function send() {
var data = document.getElementById("input").value;
log("You> " + data);
myCharacteristic.writeValue(str2ab(data+"\n"))
document.getElementById("input").value = "";
}
