clone https://atadiat.com/en/e-esp8266-esp32-wifi-serial-bridge-converter/
Serial Bridge Using ESP8266 (Simpler)
esp-12s_product_specification_en.pdf
debug baud rate changed to 115200
dummy testing string "n\xiaolaba\n"
open putty
host 192.168.4.1
port 8880
connection type : RAW
open arduino IDE serial port monitor
type something and send
burn.bat
note : if not to use arduino IDE to burn firnware, close serial port monitor first before uses this BAT file to burn the firmware, otherwise port access failure and no code to be burned.
:: by xiaolaba, 2022-JAN-20
set COM_PORT=COM11
set BAUD_RATE=921600
set FIRMWARE=wifi-serial.ino.bin
%USERPROFILE%\AppData\Local\Arduino15\packages\esp8266\tools\python3\3.7.2-post1/python3 ^
-I %USERPROFILE%\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2/tools/upload.py ^
--chip esp8266 ^
--port %COM_PORT% ^
--baud %BAUD_RATE% ^
--before default_reset ^
--after hard_reset write_flash 0x0 %FIRMWARE%
pause