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3.2. BLUETOOTH SERIAL
Open the Arduino IDE and open the example program
`File`->`Examples`->`BluetoothSerial`->`SerialToSerialBT`. Connect the device to the computer
and select the corresponding port to burn. After completion, the device will automatically run
Bluetooth, and the device name is `ESP32test`. At this time, use the Bluetooth serial port sending
tool on the PC to realize the transparent transmission of Bluetooth serial data.
#include "BluetoothSerial.h"
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