WeMos D1 (ESP8266 board) to be used as Arduino to talk MODBUS to SCADA

I would like to use WeMos D1 R2 board (ESP8266 based) as Arduino controller to communicate with SCADA system over MODBUS IP protocol. I am using Home Edition of mySCADA  software from http://www.myscada.org/

I am a bit confused with different flavors of libraries and multiple possible software/hardware configurations. I would appreciate detailed instructions how to set it up. Thank you,
