To clarify Crossbow's remarks: groov indeed communicates with an OPC UA server as an OPC UA Client. That may be a PC running an OPC UA Server, or a device with an embedded OPC UA server. However, that's not the only way groov communicates to equipment. The release of groov 2.3 back in January added Modbus/TCP comms as well. So if your PLC or device talks Modbus over Ethernet (Modbus/TCP), you can use groov. Also, it is not necessary for your tablet or smartphone to have access to the control system network (OPC Server or PLC). The groov Box ships with 2 independent Ethernet interfaces. One can be connected to the IT/office network. The other is connected to your control network. Because they are independent interfaces, and separate network address spaces, groov safely segments the two networks completely. Yet, all the data on the control network is accessible to mobile devices connected to the IT/office network via a secure and encrypted HTTPS connection, authenticated through groov. The above works with the groov Box, and with groov Server for Windows on a dual NIC configured PC. You can try out groov free of charge at: http://groov.com/free-trial/ You can view a video on how to get started with groov and Modbus/TCP here: http://groov.com/groov-2-3-direct-modbus/ Finally, I'm not suggesting groov is the right fit for the OP's (original poster) application. I'm only correcting and clarifying other responses. Cheers. -Benson
