This project is ported from:
- ESP8266 RTOS SDK modbus tcp-slave example.
- modbus_rtu2tcp
https://github.com/meijie-jesse/Spark-ESP8266-Smart-Device
restruct code.Integrate WebServer for configuration.Configure Slave Id in AP mode, then broadcast configured slave Id in mDNS.slave ID has can be replaced by IP in tcp modbus.FOTA