readme
# nvs-dotenv
[](https://components.espressif.com/components/igrr/nvs-dotenv)
`nvs-dotenv` is an ESP-IDF component which makes variables defined in a `.env` file accessible using `getenv` function:
- Create a `.env` file inside you project directory
- Keep various local configs and secrets in `.env` — Wi-Fi credentials, API tokens, and so on.
- In your ESP-IDF application, call `getenv` function to access these variables
With `nvs-dotenv`, you won't have to:
- hardcode credentials in your application source code
- store the credentials in sdkconfig, and wait for the entire app to rebuild when you change them.
`nvs-dotenv` is intended to be used mainly during the development phase. In a production device you will likely need a provisioning workflow of some sort.
## Using the component
1. In an existing ESP-IDF project, run the following command to install the component:
```bash
idf.py add-dependency "igrr/nvs-dotenv"
```
2. Edit your partition table, adding a new partition:
```csv
# Name, Type, SubType, Offset, Size, Flags
dotenv, data, nvs, , 12k,
```
3. Create a `.env` file in your project directory:
```
WIFI_SSID=yyyyyy
WIFI_PASS=xxxxxx
```
4. In the application, initialize `nvs-dotenv`:
```c++
ESP_ERROR_CHECK(nvs_dotenv_load());
```
5. Now you can access variables from `.env` using `getenv`:
```c++
const char *ssid = getenv("WIFI_SSID");
```
## Example
This component includes an example illustrating the above steps. You can try the example as follows:
```bash
idf.py create-project-from-example "igrr/nvs-dotenv:nvs-dotenv-example"
```
Then build as usual:
```bash
cd nvs-dotenv-example
idf.py build
```
And flash it to the board:
```bash
idf.py -p PORT flash monitor
```
The output should be:
```
I (3263) example: Loading environment variables
I (6033) example: WIFI_SSID: yyyyyy
I (6053) example: WIFI_PASS: xxxxxx
```
## License
This component is provided under Apache 2.0 license, see [LICENSE](LICENSE.md) file for details.
api
# API Reference
## Header files
- [nvs_dotenv.h](#file-nvs_dotenvh)
## File nvs_dotenv.h
## Functions
| Type | Name |
| ---: | :--- |
| esp\_err\_t | [**nvs\_dotenv\_load**](#function-nvs_dotenv_load) (void) <br>_Load environment variables from NVS._ |
## Functions Documentation
### function `nvs_dotenv_load`
_Load environment variables from NVS._
```c
esp_err_t nvs_dotenv_load (
void
)
```
**Returns:**
ESP\_OK on success