A generic firmware for an ESP32 to be used as a Modbus TCP/IP gateway for any modbus RTU device. Default RX/TX pins for the TTL-RS485 communication are used from hardware-serial2 (check pinout of your esp32-board for UART2-TX and UART2-RX). If you like to use different RX/TX pins, you can define them as build_flags in the platformio.ini. E.g.: build_flags = -DRX_PIN=14 -DTX_PIN=5
It work's for me, but there's room for improvement. If you have an idea please open an issue - if you can improve anything just create a PR.
