Check bluetooth folder in ESP-IDF examples, which contains the following demos and their tutorials:
This is a GATT sever demo and its tutorial. This demo creates a GATT service with an attribute table, which releases the user from adding attributes one by one. This is the recommended method of adding attributes.
bluetooth/gatt_server_service_table- :example_file:`GATT Server Service Table Example Walkthrough <bluetooth/gatt_server_service_table/tutorial/Gatt_Server_Service_Table_Example_Walkthrough.md>`
This is a GATT server demo and its tutorial. This demo creates a GATT service by adding attributes one by one as defined by Bluedroid. The recommended method of adding attributes is presented in example above.
bluetooth/gatt_server- :example_file:`GATT Server Example Walkthrough <bluetooth/gatt_server/tutorial/Gatt_Server_Example_Walkthrough.md>`
This is a BLE SPP-Like demo. This demo, which acts as a GATT server, can receive data from UART and then send the data to the peer device automatically.
bluetooth/ble_spp_server