Focusing on the Industry 4.0 Modbus communication standard, IGREEN has successfully developed a cloud gateway for intelligent Modbus devices. In 2011, IGREEN even passed the Taoyuan City's local-type SBIR program to develop a more powerful cloud gateway, which not only has the Modbus data acquisition function, but also optimizes the needs of industrial applications by standardizing the cloud parameters, realizing plug-and-play gateway for the IoT, and is compatible with all the Modbus communication standard devices in the market, reducing the cost and complexity of building the IoT. In addition to the Modbus data collection function, the Cloud Gateway is optimized to meet the needs of industrial applications by standardizing the cloud parameters, realizing a plug-and-play IoT gateway that is compatible with all the Modbus standard devices in the market, reducing the cost of building IoT, and lowering the threshold of complex technology. IGREEN has already achieved the successful experience of "quick build" in several case studies.