shell_car/shellcar.html at main · IgnacioPardo/shell_car · GitHub

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<!DOCTYPE html>
<html>
    <head>
        <title>Bluetooth RC Remote</title>
        <script src="https://cdnjs.cloudflare.com/ajax/libs/crypto-js/4.2.0/crypto-js.min.js" integrity="sha512-a+SUDuwNzXDvz4XrIcXHuCf089/iJAoN4lmrXJg18XnduKK6YlDHNRalv4yd1N40OKI80tFidF+rqTFKGPoWFQ==" crossorigin="anonymous" referrerpolicy="no-referrer"></script>
    </head>
    <body>
        <button id="connect_device" onclick="connectButton()">Connect to device</button>
        <div>
            <input type="checkbox" id="turbo_mode"> Turbo
        </div>
        <div>
            <input type="checkbox" id="light_mode"> Lights
        </div>
        <div>
            Battery: <span id="battery_status">0</span>%
        </div>
        <script>
            var bluetooth = null;

            const CONTROL_SERVICE_UUID = '0000fff0-0000-1000-8000-00805f9b34fb'
            // const BATTERY_SERVICE_UUID = '0000180f-0000-1000-8000-00805f9b34fb'
            const BATTERY_SERVICE_UUID = 'd44bc439-abfd-45a2-b575-925416129601'
            const CONTROL_CHARACTERISTICS_UUID = 'd44bc439-abfd-45a2-b575-925416129600'
            const BATTERY_CHARACTERISTICS_UUID = 'd44bc439-abfd-45a2-b575-925416129601'

            const DECRYPT_KEY = "34522a5b7a6e492c08090a9d8d2a23f8";

            let bt_up = false;
            let bt_down = false;
            let bt_left = false;
            let bt_right = false;

            let lastIdleStateSend = false;

            const turboEl = document.getElementById('turbo_mode')
            const lightEl = document.getElementById('light_mode')
            const batteryEl = document.getElementById('battery_status')

            function connectButton()
            {
                requestDevice();
        }

            async function requestDevice() {
                console.log('Requesting any Bluetooth Device...');
            var device = await navigator.bluetooth.requestDevice({
                filters: [
            {namePrefix: "QCAR-" },
            ],
            // acceptAllDevices: true,
            optionalServices: [
            CONTROL_SERVICE_UUID,
            BATTERY_SERVICE_UUID,
            CONTROL_CHARACTERISTICS_UUID,
            BATTERY_CHARACTERISTICS_UUID,
            ]
            });
            await connectDevice(device);
            console.log("Device connected");
        }

            async function onDisconnected() {
                console.log('> Bluetooth Device disconnected');
            bluetooth = null;
        }

            function decryptAES(cipherText) {
            const encryptedHex = CryptoJS.enc.Hex.parse(cipherText.tohex());
            const keyHex = CryptoJS.enc.Hex.parse(DECRYPT_KEY);

            const decrypted = CryptoJS.AES.decrypt({ciphertext: encryptedHex }, keyHex, {
                mode: CryptoJS.mode.ECB,
            padding: CryptoJS.pad.NoPadding
            });

            return decrypted.toString().toUint8Array();
        }

            function encryptAES(cipherText) {
            const valueHex = CryptoJS.enc.Hex.parse(cipherText.tohex());
            const keyHex = CryptoJS.enc.Hex.parse(DECRYPT_KEY);
            const encrypted = CryptoJS.AES.encrypt(valueHex, keyHex, {
                mode: CryptoJS.mode.ECB,
            padding: CryptoJS.pad.NoPadding
            });
            return encrypted.ciphertext.toString().toUint8Array();
        }

            async function sendMessage() {
            const cmd = calculateMove();
            const encryptCmd = encryptAES(cmd);
            var service = await bluetooth.getPrimaryService(CONTROL_SERVICE_UUID);
            var characteristic = await service.getCharacteristic(CONTROL_CHARACTERISTICS_UUID);
            await characteristic.writeValue(encryptCmd);
        }


            async function connectDevice(device) {
                device.addEventListener('gattserverdisconnected', onDisconnected);
            bluetooth = await device.gatt.connect();
            return new Promise(async (resolve) => {
                const BatteryService = await bluetooth.getPrimaryService(BATTERY_SERVICE_UUID);
            const BatteryCharacteristic = await BatteryService.getCharacteristic(BATTERY_CHARACTERISTICS_UUID);
            await BatteryCharacteristic.startNotifications();
            BatteryCharacteristic.addEventListener('characteristicvaluechanged', handleNotificationsBattary);
            });
        }

            function isIdle() {
            return !(bt_up || bt_down || bt_right || bt_left);
        }

            ArrayBuffer.prototype.tohex = function () {
            return [...new Uint8Array(this)]
                .map(x => x.toString(16).padStart(2, '0'))
            .join('');
        }

            Uint8Array.prototype.tohex = function () {
            return [...new Uint8Array(this)]
                .map(x => x.toString(16).padStart(2, '0'))
            .join('');
        }

            String.prototype.toUint8Array = function () {
            return Uint8Array.from(this.match(/.{1, 2}/g).map((byte) => parseInt(byte, 16)));
        }

            function calculateMove() {
            const turbo = turboEl.checked || false;
            const light = lightEl.checked || false;

            const up = bt_up;
            const down = bt_down;
            const left = bt_left;
            const right = bt_right;

            const cmd = new Uint8Array(16);

            cmd[1] = 0x43;
            cmd[2] = 0x54;
            cmd[3] = 0x4c;
            cmd[8] = 1;
            cmd[9] = 0x50;

            if (up) cmd[4] = 1;
            if (down) cmd[5] = 1;
            if (left) cmd[6] = 1;
            if (right) cmd[7] = 1;

            if (light) cmd[8] = 0;
            if (turbo) cmd[9] = 0x64;

            // console.log(cmd.tohex());
            return cmd
        }

            function handleNotificationsBattary(event) {
                let value = event.target.value;
            let decrypt = decryptAES(value.buffer)
            batteryEl.innerHTML = decrypt[4];
        }

            setInterval(async function () {
            if (!bluetooth) return;
            await sendMessage();
        }, 100);

            window.addEventListener("keydown", function(event) {
            switch (event.key) {
                case "ArrowUp": {
                bt_up = true;
            break
                }
            case "ArrowDown": {
                bt_down = true;
            break;
                }
            case "ArrowLeft": {
                bt_left = true;
            break
                }
            case "ArrowRight": {
                bt_right = true;
            break
                }
            }
        });

            window.addEventListener("keyup", function (event) {
            switch (event.key) {
                case "ArrowUp": {
                bt_up = false;
            break
                }
            case "ArrowDown": {
                bt_down = false;
            break;
                }
            case "ArrowLeft": {
                bt_left = false;
            break
                }
            case "ArrowRight": {
                bt_right = false;
            break
                }
            }
        })

        </script>

    </body>
</html>