Filter connections for Async Socket Server

[Macca]

Hi,

My app has an asynchronous socket server to receive and transmit data over
ethernet connections coming in through a switch.

My App will handle concurrent data for possibly 20+ embedded C devices.

My app will reside on a PC that is also connected to an office network. What
I have found is that using the Socket server app examples from the net, they
usually listen for all connections to the PC that the app is residing on.

I have found that the connection to the office network is blocking the
connections to the embedded devices.

Is there a way to block the connection to the Office network so that my app
only listens/processes connections to the embedded devices?

Thanks In Advance
Macca