...Get free Download Evaluation Kit - IEC 104 Development Bundle
In the Development Bundle, We included IEC 60870-5-104 Server & Client Simulator, Windows & Linux SDK.
http://www.freyrscada.com/iec-60870-5-104.php
http://www.freyrscada.com/iec-60870-5-104-Windows-Software-Development-Kit(SDK).php
video tutorial:
https://www.youtube.com/playlist?list=PL4tVfIsUhy1bx7TVjtZnqFB6tbZBhOlJP