esp-idf/examples/bluetooth/gatt_server/README.rst

ESP-IDF GATT SERVER demo
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This is the demo for user to use ESP_APIs to create a GATT Server.The demo can send adv data,
be connected by client. Run the gatt_client demo, the client demo will automatically connect
to the gatt_server demo. The client demo will enable gatt_server's notify after connection.
Then the two devices will exchange data.