如何在kotlin中通过蓝牙接收字符串

dependencies {
    implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-android:1.5.2'
    implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-core:1.5.2'
    implementation 'org.jetbrains.kotlinx:kotlinx-serialization-json:1.3.0'
    implementation 'com.juul.kable:0.9.0'
}

private val bluetoothAdapter: BluetoothAdapter? = BluetoothAdapter.getDefaultAdapter()

private val REQUEST_ENABLE_BLUETOOTH = 1

// 检查蓝牙是否开启
if (bluetoothAdapter == null) {
    // 不支持蓝牙
} else {
    if (!bluetoothAdapter.isEnabled) {
        val enableBtIntent = Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE)
        startActivityForResult(enableBtIntent, REQUEST_ENABLE_BLUETOOTH)
    } else {
        // 蓝牙已开启
    }
}

val scanner = bluetoothAdapter?.bluetoothLeScanner
val scanSettings = ScanSettings.Builder().setScanMode(ScanSettings.SCAN_MODE_LOW_POWER).build()
val scanCallback = object : ScanCallback() {
    override fun onScanResult(callbackType: Int, result: ScanResult) {
        // 处理扫描到的蓝牙设备
        val device = result.device
        // 连接到蓝牙设备
        device.connectGatt(context, false, gattCallback)
    }
}
scanner?.startScan(null, scanSettings, scanCallback)

val gattCallback = object : BluetoothGattCallback() {
    override fun onConnectionStateChange(gatt: BluetoothGatt?, status: Int, newState: Int) {
        if (newState == BluetoothProfile.STATE_CONNECTED) {
            // 蓝牙设备已连接，可以开始通信
            gatt?.discoverServices()
        } else if (newState == BluetoothProfile.STATE_DISCONNECTED) {
            // 蓝牙设备已断开连接
        }
    }

    override fun onServicesDiscovered(gatt: BluetoothGatt?, status: Int) {
        // 发现蓝牙设备的服务
        val service = gatt?.getService(serviceUuid)
        val characteristic = service?.getCharacteristic(characteristicUuid)
        
        // 启用通知
        gatt?.setCharacteristicNotification(characteristic, true)
        val descriptor = characteristic?.getDescriptor(descriptorUuid)
        descriptor?.value = BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE
        gatt?.writeDescriptor(descriptor)
    }

    override fun onCharacteristicChanged(
        gatt: BluetoothGatt?,
        characteristic: BluetoothGattCharacteristic?
    ) {
        // 收到蓝牙设备发送的数据
        val data = characteristic?.value?.toString(Charsets.UTF_8)
        // 处理收到的字符串数据
    }
}