1| Supported Targets | ESP32 | ESP32-C3 | 2| ----------------- | ----- | -------- | 3 4# ESP-IDF Gatt Client Multi Connection Example 5 6This example shows the usage of APIs to create a GATT multi-connection client. It can be used to connect to three GATT servers at the same time. 7 8To test this example, please run [gatt_server_demo](../gatt_server) to create three GATT server devices, namely ESP_GATTS_DEMO_a, ESP_GATTS_DEMO_b and ESP_GATTS_DEMO_c, `Gatt_client_multi_connection_demo` will connect to these three gatt server demos, and then exchange data. 9 10Please, check this [tutorial](tutorial/Gatt_Client_Multi_Connection_Example_Walkthrough.md) for more information about this example. 11 12## How to Use Example 13 14Before project configuration and build, be sure to set the correct chip target using: 15 16```bash 17idf.py set-target <chip_name> 18``` 19 20The code can be modified to connect to more devices (up to 4 devices by default). If you need to connect to more devices (more than 4 devices), you need to change `BT/BLE MAX ACL CONNECTIONS` in menuconfig. 21 22### Hardware Required 23 24* A development board with ESP32/ESP32-C3 SoC (e.g., ESP32-DevKitC, ESP-WROVER-KIT, etc.) 25* A USB cable for Power supply and programming 26 27See [Development Boards](https://www.espressif.com/en/products/devkits) for more information about it. 28 29### Build and Flash 30 31Run `idf.py -p PORT flash monitor` to build, flash and monitor the project. 32 33(To exit the serial monitor, type ``Ctrl-]``.) 34 35See the [Getting Started Guide](https://idf.espressif.com/) for full steps to configure and use ESP-IDF to build projects. 36 37## Example Output 38 39``` 40I (0) cpu_start: Starting scheduler on APP CPU. 41I (512) BTDM_INIT: BT controller compile version [1342a48] 42I (522) system_api: Base MAC address is not set 43I (522) system_api: read default base MAC address from EFUSE 44I (522) phy_init: phy_version 4670,719f9f6,Feb 18 2021,17:07:07 45I (932) GATTC_MULTIPLE_DEMO: REG_EVT 46I (932) GATTC_MULTIPLE_DEMO: REG_EVT 47I (932) GATTC_MULTIPLE_DEMO: REG_EVT 48I (942) GATTC_MULTIPLE_DEMO: Scan start success 49I (1072) GATTC_MULTIPLE_DEMO: 38 68 a4 69 bb 7c 50I (1072) GATTC_MULTIPLE_DEMO: Searched Adv Data Len 28, Scan Response Len 0 51I (1072) GATTC_MULTIPLE_DEMO: Searched Device Name Len 0 52I (1082) GATTC_MULTIPLE_DEMO: 53 54I (1102) GATTC_MULTIPLE_DEMO: 08 ef 3b a7 04 41 55I (1102) GATTC_MULTIPLE_DEMO: Searched Adv Data Len 9, Scan Response Len 15 56I (1102) GATTC_MULTIPLE_DEMO: Searched Device Name Len 13 57I (1112) GATTC_MULTIPLE_DEMO: LG CM2760(41) 58I (1112) GATTC_MULTIPLE_DEMO: 59 60I (1222) GATTC_MULTIPLE_DEMO: 38 68 a4 69 bb 7c 61I (1222) GATTC_MULTIPLE_DEMO: Searched Adv Data Len 28, Scan Response Len 0 62I (1222) GATTC_MULTIPLE_DEMO: Searched Device Name Len 0 63I (1232) GATTC_MULTIPLE_DEMO: 64 65I (1372) GATTC_MULTIPLE_DEMO: 38 68 a4 69 bb 7c 66I (1372) GATTC_MULTIPLE_DEMO: Searched Adv Data Len 28, Scan Response Len 0 67I (1372) GATTC_MULTIPLE_DEMO: Searched Device Name Len 0 68I (1382) GATTC_MULTIPLE_DEMO: 69 70I (1412) GATTC_MULTIPLE_DEMO: 08 ef 3b a7 04 41 71I (1412) GATTC_MULTIPLE_DEMO: Searched Adv Data Len 9, Scan Response Len 15 72I (1422) GATTC_MULTIPLE_DEMO: Searched Device Name Len 13 73I (1422) GATTC_MULTIPLE_DEMO: LG CM2760(41) 74I (1432) GATTC_MULTIPLE_DEMO: 75 76I (1522) GATTC_MULTIPLE_DEMO: 38 68 a4 69 bb 7c 77I (1522) GATTC_MULTIPLE_DEMO: Searched Adv Data Len 28, Scan Response Len 0 78I (1522) GATTC_MULTIPLE_DEMO: Searched Device Name Len 0 79I (1532) GATTC_MULTIPLE_DEMO: 80``` 81 82## Troubleshooting 83 84For any technical queries, please open an [issue](https://github.com/espressif/esp-idf/issues) on GitHub. We will get back to you soon. 85
