Steps to recreate this problem:

• Make a ArtNet stream with multiple universes. In my example I have 8. The first 3 are active, so there are fixtures that are controlled in those 3 universes.
• Now run the following example script:

import time
import sys
import python_artnet as Artnet
import os

def get_eth0_ip():
    try:
        # Get the IP address of the eth0 interface
        eth0_ip = str(os.system("ip -4 -o addr show eth0 | awk '{print $4}' | cut -d '/' -f 1 "))
        return eth0_ip
    except (KeyError, IndexError, OSError) as e:
        print(f"Error getting eth0 IP: {e}")
        exit

debug = False

# You can choose between setting your own IP or if you run this on a Pi getting a IP automatically form eth0
# artnetBindIp = str(get_eth0_ip())
artnetBindIp = "10.0.0.4"

artnetUniverse = 0

### Art-Net Setup ###
# Creates Artnet socket on the selected IP and Port
artNet = Artnet.Artnet(artnetBindIp, DEBUG=debug)

while True:
    try:
        # Read latest ArtNet packet
        artNetPacket = artNet.readPacket()
        # Print out the universe of said packet
        print("My univ: "+str(artNetPacket.universe))
    
    # Big red stop button just in case
    except KeyboardInterrupt:
        break
    # Give me that exceptions
    except Exception as e:
        print(e)
    # Slow down there young fella
    time.sleep(0.1)

# Bro, close dat shit! It is over for today! No more Mario Kart 8 Deluxe
artNet.close()
sys.exit()

Result:
Run that script and you will only get printed out every universe starting from 2 (be aware that actually this is universe 3 since ArtNet universes start counting at 0).

Solution:
I don't really have a solution but I have a hint.
In the python_artnet.py module script on line 180 I put a print(packet.universe) and every universe starting from 0 got printed out.
Maybe there is an issue when making the packets to arrays but idk about that.

Hey there, sorry if this is the wrong place to ask for help :(

I'm trying to pull DMX information from my DJ decks via Art-Net to control some lights, but unfortunately I can't grab any packets containing DMX data. With debug on, this is the only output I get:

poll! b'Art-Net\x00' b'\x00!' 10 10 10 1 b'6\x19' b'14' 0 0 43981 0 48 b'\xf0\x7f' b'python_artnet\x00\x00\x00\x00\x00' b'python_artnet\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00' b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00' 1 128 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 b'\x00\x00\x00' 0 b'\xaa' b'\xbb' b'\xcc' b'\xdd' b'\xee' b'\xff' 0 0 0 0 0 13 192 0 b'\x00\x00\x00\x00\x00\x00' 0 44 b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00' sent!

This output repeats over and over with none of the bytes changing at all.

Python-artnet is indeed showing up as an interface on my DJ decks, so obviously something is communicating back and forth, but I can't seem to get any data other than what's above. Any help or insight would be super appreciated as I'm super unfamiliar with Art-Net and maybe you might have an idea of what's going on :( Thank you!

I think currently if you have a setup with a large number of universes, the library will throw an error. The library's limit is possibly 16 based on this, the spec allows up to a theoretical maximum of 32,768 universes (though the practical limit is lower).

It's somewhat an edge case, but would be great if this limit could either be configurable, or could be adjusted to accept an arbitrary number of universes. I'm happy to put in a pull request if you have a preferred approach.