| Supported Targets | ESP32 | ESP32-C2 | ESP32-C3 | ESP32-C5 | ESP32-C6 | ESP32-C61 | ESP32-H2 | ESP32-S3 |
| ----------------- | ----- | -------- | -------- | -------- | -------- | --------- | -------- | -------- |

## ESP-IDF GATT SERVER SPP Example

For description of this application please refer to [ESP-IDF GATT CLIENT SPP Example](../ble_spp_client/README.md)

## Flow Diagram

```
   SPP Server                                              SPP Client
 ┌───────────┐                                           ┌───────────┐
 │   UART    │                                           │   UART    │
 │ Terminal  │                                           │ Terminal  │
 └─────┬─────┘                                           └─────┬─────┘
       │                                                       │
       │  ─────────── Initialization ───────────               │
       │                                                       │
       │  1. Create SPP Service (UUID: 0xABF0)                 │
       │  2. Add Characteristics                               │
       │  3. Start Advertising                                 │
       │                                                       │
       │  ─────────── Connection ───────────                   │
       │                                                       │
       │                          Scan & Connect               │
       │ <───────────────────────────────────────────────────  │
       │                                                       │
       │  Connection Established                               │
       │ ─────────────────────────────────────────────────────>│
       │                                                       │
       │  ─────────── Data Exchange ───────────                │
       │                                                       │
       │  UART Input ──> Notification (SPP_DATA_NOTIFY_CHAR)   │
       │ ─────────────────────────────────────────────────────>│──> UART Output
       │                                                       │
       │  UART Output <── WriteNoRsp (SPP_DATA_RECV_CHAR)      │
       │ <───────────────────────────────────────────────────  │<── UART Input
       │                                                       │
 ┌─────┴─────┐                                           ┌─────┴─────┐
 │SPP Server │                                           │ SPP Client│
 └───────────┘                                           └───────────┘
```

## How to Use Example

Before project configuration and build, be sure to set the correct chip target using:

```bash
idf.py set-target <chip_name>
```

### Hardware Required

* A development board with ESP32/ESP32-C3/ESP32-S3/ESP32-C2/ESP32-H2 SoC (e.g., ESP32-DevKitC, ESP-WROVER-KIT, etc.)
* A USB cable for Power supply and programming

See [Development Boards](https://www.espressif.com/en/products/devkits) for more information about it.

### Build and Flash

Run `idf.py -p PORT flash monitor` to build, flash and monitor the project.

(To exit the serial monitor, type ``Ctrl-]``.)

See the [Getting Started Guide](https://idf.espressif.com/) for full steps to configure and use ESP-IDF to build projects.

## Example Output

```
I (4452) GATTS_SPP_DEMO: EVT 14, gatts if 3
I (4452) GATTS_SPP_DEMO: event = e
I (5022) GATTS_SPP_DEMO: EVT 4, gatts if 3
I (5022) GATTS_SPP_DEMO: event = 4
I (5152) GATTS_SPP_DEMO: EVT 2, gatts if 3
I (5152) GATTS_SPP_DEMO: event = 2
I (5152) GATTS_SPP_DEMO: ESP_GATTS_WRITE_EVT : handle = 5
I (5242) GATTS_SPP_DEMO: EVT 2, gatts if 3
I (5242) GATTS_SPP_DEMO: event = 2
I (5242) GATTS_SPP_DEMO: ESP_GATTS_WRITE_EVT : handle = 10
I (18462) GATTS_SPP_DEMO: EVT 5, gatts if 3
I (18462) GATTS_SPP_DEMO: event = 5
I (27652) GATTS_SPP_DEMO: EVT 2, gatts if 3
I (27652) GATTS_SPP_DEMO: event = 2
I (27652) GATTS_SPP_DEMO: ESP_GATTS_WRITE_EVT : handle = 2
```

## Troubleshooting

For any technical queries, please open an [issue](https://github.com/espressif/esp-idf/issues) on GitHub. We will get back to you soon.