“Ethernet” has become mainstream and has been widely used in industrial automation networks. OT engineers could use OT NMS monitor Ethernet switches, routers, etc. network devices in OT networks; however, many onsite machines and devices with serial, I/O, and other hardwired interfaces are not updated simultaneously due to high cost, which requires edge connectivity hardware, such as serial device servers, protocol gateways, or edge computers, to communicate with Ethernet infra. Thus, those edge connectivity in the field sites is currently the blind spot of OT networks.