I work with building automation and I am trying to debug my traffic. But I can only sniff the packages that are sent to the .255 address. I need to se the point to point packages. Is this possible?

You need a switch and not a hub.We use Netgear DS104. You can find on ebay or ask some of the old farts in the office. They are ways to accomplish this with a managed switch but the hub would be your easiest option.