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Continue to ChatESP32 - BLE : Building an Echo Service GATT Server https://thejeshgn.com/2018/06/11/esp32-ble-building-an-echo-service-gatt-server/
ESP32 - BLE : Building an Echo Service GATT Server https://thejeshgn.com/2018/06/11/esp32-ble-building-an-echo-service-gatt-server/