Designed by Namnam in Vietnam, the ESP32 Modbus gateway is built to communicate with PLCs and industrial sensors over Modbus ...

You do need Java on the workstation to get everything working. We’ve seen ESP32 OTA done before. You can even pull the same stunt with an Arduino.

Connect to the ESP32 over serial, and hit enter to stop it from continually rebooting. Falling back to built-in command interpreter. Woot.