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If you need upload sketch in some distance from PC, to use this device. After montage, you configure JDY-31 as SPP and baud rate to 115200. Paire device with PC. Configure in Device manager in PC Bluetooth com port baud rate 115200. In Arduino IDE Upload speed: 115200 and Reset metod: dtr(aka nodemcu), Port: comX(Bluetooth port).
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