There are two different versions of the device, one is the "Plug & Play", the other is the version for developing custom software.
My solution requires the custom version. I am not really sure of the capabilities of the P&P unit so not sure if you can do what you need with it.
If you decide to use the custom version, you will need to buy the "Development Kit with NetOS"(see Digi Websit). This provide a hardware and software development environment that you can program in 'C', and is reasonably straightforward to get working.