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/*
* This code is written with a lot of help from these resources:
* https://github.com/antefact/microBit.js/blob/master/src/microBit.js
* https://gist.github.com/kotobuki/7c67f8b9361e08930da1a5cfcfb0653f
* https://lancaster-university.github.io/microbit-docs/resources/bluetooth/bluetooth_profile.html
*/
const UART_SERVICE_UUID = "6e400001-b5a3-f393-e0a9-e50e24dcca9e";
const UART_TX_CHARACTERISTIC_UUID = "6e400002-b5a3-f393-e0a9-e50e24dcca9e";
const UART_RX_CHARACTERISTIC_UUID = "6e400003-b5a3-f393-e0a9-e50e24dcca9e";
export default class uBitBLE {
constructor() {
let device;
this.onConnectCallback = function() {};
this.onDisconnectCallback = function() {};
this.onUartTxCallback = function() {};
this.characteristic = {
UART_RX: {},
UART_TX: {}
}
}
onConnect(callbackFunction) {
this.onConnectCallback = callbackFunction;
}
onDisconnect(callbackFunction) {
this.onDisconnectCallback = callbackFunction;
}
onUartTx(callbackFunction) {
this.onUartTxCallback = callbackFunction;
}
sendUart(string) {
if (this.isConnected() && this.characteristic.UART_RX) {
let encoder = new TextEncoder();
this.characteristic.UART_RX.writeValue(
encoder.encode(string)
).catch(error => {
console.log(error);
});
}
}
isConnected() {
if (this.device) {
return this.device.gatt.connected;
} else {
return false;
}
}
disconnect() {
if (this.isConnected()) {
this.device.gatt.disconnect();
}
}
searchDevice() {
navigator.bluetooth.requestDevice({
filters: [{namePrefix: "BBC micro:bit"}],
optionalServices: [UART_SERVICE_UUID]
})
.then(device => {
console.log('> Name: ' + device.name);
console.log('> Id: ' + device.id);
this.device = device;
device.addEventListener('gattserverdisconnected', this.onDisconnectCallback);
// Attempts to connect to remote GATT Server.
return device.gatt.connect();
})
.then(server => {
// Note that we could also get all services that match a specific UUID by
// passing it to getPrimaryServices().
this.onConnectCallback();
console.log('Getting Services...');
return server.getPrimaryServices();
})
.then(services => {
console.log('Getting Characteristics...');
let queue = Promise.resolve();
services.forEach(service => {
queue = queue.then(_ => service.getCharacteristics().then(characteristics => {
console.log('> Service: ' + service.uuid);
characteristics.forEach(characteristic => {
console.log('>> Characteristic: ' + characteristic.uuid + ' ' +
getSupportedProperties(characteristic));
switch (characteristic.uuid) {
case UART_RX_CHARACTERISTIC_UUID:
this.characteristic.UART_RX = characteristic;
break;
case UART_TX_CHARACTERISTIC_UUID:
this.characteristic.UART_TX = characteristic;
this.characteristic.UART_TX.startNotifications();
this.characteristic.UART_TX.addEventListener(
"characteristicvaluechanged",
(event) => { this.onUartTxCallback(eventByteArrayToString(event)) }
);
break;
default:
}
});
}));
});
return queue;
})
.catch(error => {
console.log('Argh! ' + error);
});
}
}
function getSupportedProperties(characteristic) {
let supportedProperties = [];
for (const p in characteristic.properties) {
if (characteristic.properties[p] === true) {
supportedProperties.push(p.toUpperCase());
}
}
return '[' + supportedProperties.join(', ') + ']';
}
function eventByteArrayToString(event) {
let receivedData = [];
for (var i = 0; i < event.target.value.byteLength; i++) {
receivedData[i] = event.target.value.getUint8(i);
}
return String.fromCharCode.apply(null, receivedData);
}
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