bug with many universes

[ExMachina-ca]

Hello.
It looks like this library doesn't filter out the desired universe correctly.

For example, this is observed with a GrandMA onPC broadcasting 8 artnet universes. The artnet device is set to respond to universe 1, and all channels on all universes are set to 0. When the DMX Channel of the device is set to a value other then 0, the device responds and displays the correct value, but is then immediately reset to zero by the values of the other universes. It then flashes the correct value for a fraction of a second whenever the onPC software sends an artnet refresh on the network, once about every seconds.

If we set the onPC software to only broadcast 1 universe, the correct one for the device, it behaves correctly and displays the correct value.