then have Resolume listen on same address
Except that listening happens on the same IP address and port as the sender, which at that moment is bound to QLC+
Art-Net is a network protocol. So, like any network protocol, it's problematic to bind two applications to the same port. Think of IP addresses as houses and ports as doors in that house. The moment two apps claim they share the same door in the same house, it gets confusing as to who has to answer when there's a knock on the door. This gets even more cosmic when one app is throwing stuff out that door and another app has to catch that same stuff in that same door.
To avoid these problems, two applications binding on the same port is considered undefined behaviour and generally a bad idea. It's why two applications cannot both listen to the same OSC port.
People working with Art-Net tend to bend the rules when it comes to network protocols. Being a pretty old protocol, rules are considered more like guidelines when it comes to getting certain functionality to work (What? You want more than 4 universes on the same connection? Madness!) So most Art-Net applications will generally allow two apps to bind to the same port. In most cases, one will be sending and one will be receiving, so overall it works out fine.
So in the upcoming 5.1.0 release, we will join the ranks of the Art-Net hacks, and you will be able to send Art-Net to Resolume from another application running on the same computer. When doing so, there's no need to use a special IP range. You can use 127.0.0.1, 2.0.0.x, 10.0.0.x, 192.168.0.x or whatever IP your computer is set to at that moment.
