如何通过 android 应用程序执行 BLE 无线固件更新

Question

我正在尝试开发一个 android 应用程序来与 BLE 设备进行通信。我能够从 BLE 设备读取和写入特性。现在我想通过我的应用程序为设备执行 ble OTA 更新。我不知道该怎么办？如果我有 OTA 更新文件，如何在 ble 设备上安装它以及如何执行 OTA 升级？

Answer 1

使用

从文件中读取数据

protected byte[] readFile(File file) {
    BufferedInputStream buf;
    int size = (int) file.length();
    byte[] mDataFile = new byte[size];
    //mDataFile = new byte[size];
    try {
        buf = new BufferedInputStream(new FileInputStream(file));
        buf.read(mDataFile, 0, size);
    } catch (IOException e) {
        e.printStackTrace();
    }
    return mDataFile;
}

然后，开始设备扫描。使用特定的 macAddress 连接设备后 调用方法connectToDevice

public static BluetoothGatt connectToDevice(Context context,
                                   BluetoothDevice device,
                                   BluetoothGattCallback mGattCallBack){
    BluetoothGatt connectedGatt = null;
    if (device != null) {
        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {
            connectedGatt = device.connectGatt(context, false,
                    mGattCallBack,
                    BluetoothDevice.DEVICE_TYPE_LE,
                    BluetoothDevice.PHY_LE_2M|BluetoothDevice.PHY_LE_1M);
        }else if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.M) {
            connectedGatt = device.connectGatt(context, false, mGattCallBack, BluetoothDevice.DEVICE_TYPE_LE);
        } else if (android.os.Build.VERSION.SDK_INT >= 21) {
            connectedGatt = connectGattApi21(context, device, mGattCallBack);
        } else {
            connectedGatt = device.connectGatt(context, false,
                    mGattCallBack);
        }
    } else {
        //WiSeSdkFileWritter.writeToFile(fileName, TAG + " FAILED could not find remote device/ remote device is null >>" + macAddress);
    }
    return connectedGatt;
}

然后处理BluetoothGattCallback回调方法——onServicesDiscovered,onCharacteristicWrite,onConnectionStateChange

在 onServicesDiscovered 方法中，您将获得 BluetoothGattService。从 gattService 中提取特征。最后将特征写入ble设备。

     BluetoothGattCallback bluetoothGattCallback = new BluetoothGattCallback() {
    @Override
    public void onConnectionStateChange(BluetoothGatt gatt, int status, int newState) {
        super.onConnectionStateChange(gatt, status, newState);
    }

    @Override
    public void onServicesDiscovered(BluetoothGatt gatt, int status) {
        super.onServicesDiscovered(gatt, status);

    BluetoothGattService mService = gatt.getService(service);

        mCharacteristics = mService.getCharacteristic(characteristics);
        mCharacteristics.setValue(bytes);


        Logger.v(TAG, "data write count  ::" + writeCounter++);

        Timer t = new Timer();
        TimerTask task = new TimerTask() {
            @Override
            public void run() {

                gatt.writeCharacteristic(mCharacteristics);
            }
        }; 
    }

    @Override
    public void onCharacteristicRead(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, int status) {
        super.onCharacteristicRead(gatt, characteristic, status);
    }

    @Override
    public void onCharacteristicWrite(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, int status) {
        super.onCharacteristicWrite(gatt, characteristic, status);
    }

    @Override
    public void onCharacteristicChanged(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic) {
        super.onCharacteristicChanged(gatt, characteristic);
    }
};