nuttx/boards/xtensa/esp32/esp32-devkitc/configs/modbus
Alan C. Assis 065553e59b boards: Add modbus board profile to esp32-devkitc
You can use mbpoll to read Modbus Input registers:

$ mbpoll -a 10 -b 115200 -P none -t 3 -r 1000 -c 4 /dev/ttyUSB0 -R
2022-01-10 10:49:16 +08:00
..
defconfig